Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. In my experience startup fuel tends to be too much. Extending wires with too small of a wire gauge will also result in the same damage. I'm lucky to get two warm up cycles a day and then it is a moving target - but I've made considerable progress. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. You need a new fuel pump. https://www.msdperformance.com/suppos/#EngineRunOn, If this is your first visit, be sure to After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. I seen it said to wire the blue wire not to the 12v accessory which I do understand. That added fuel is called after-start enrichment. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. Ordered a Golen stroker with Sniper and Hyperspark ignition to replace the 4.2 in my 89. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. Exactly. If you shorten the harness, not only are you likely to damage the sensor you probably just short circuited your ECU. Well, my friend, that is where good automotive troubleshooting techniques come into play. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. I have just finished installing my Holley Sniper to my 67 Camaro. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. I see recommended plugs are resistor type. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. This is most easily done using the blue fuel pump wire. From what I read it should not be installed vertically? Sure enough the pink wire DID NOT have voltage when cranking. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. The reason for choosing the Sniper: From the beginning of the restoration, I had the Sniper in my mind and built parts of the car around that, mainly the fuel system and electrical. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. Everyone else was backordered several months. You are on the right track!Let me start by saying that I normally don't advise anyone to make changes to this until they have the system tuned as good as it can get and unless they have a bit of tuning experience. idles good, runs amazing. That means at or above 55 PSI it is capable of flowing ZERO fuel. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). If you turn the ignition off and back on, & crank it, it will start & die again. We can adjust that with the after-Start enrichmentIll bump that up a bit. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. EFI Systems based on Holley's world-class Dominator and HP ECU's. All seemed well with the setup and going through the handheld. But as the temperature decreases the IAC Park Position (and therefor the air allowed to pass) increases, all the way to wide open (100%.). ), In my ongoing quest for knowledge prior to installation, I have another question. Does the sniper kit support dual O2 sensors? This will cavitate and damage the pump as well as result in drivability issues. Once engine is warmed up been driving for awhile. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. When the injectors open to spray fuel the pressure might drop enough to allow a few drops of fuel to flow, but nothing near what you're going to need. Sure. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. But let me elaborate a bit. And that from a not-so-shabby original 1.13-second start time. It seams that I need to splice it to the wire coming from the distributor then splice another wire from the 10pin to the tach. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. It's almost impossible to hurt an engine with no load on it. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. Unfortunately, I know NOTHING about throttle stops. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. MAIN POWER AND GROUND need to go to the battery. Capability Range: Professional Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. That's what the fuel prime is all about. "I've edited the article with a note about the difference. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. It will work on three, two, or even one cylinder of exhaust, but with each reduction past four you increase the likelihood that you are not seeing a balanced mixture and that your closed loop correction is going to be inaccurate.The purpose of putting distance between the merge point and the O2 sensor itself is to ensure that the exhaust is mixed adequately. Would it start & quit like that if the switched wire wasnt working? I am letting it set over night, cleaned plugs as well. If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. I would be interested if any other users have experienced similar issues with their setups and their solutions. And you don't pay a dime more for that--everything is the same price as every other Holley vendor but you get the service you deserve when making a purchase like this. All of these values are configurable. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. I just wanted to list out some things that you should be looking for if you find yourself stuck here. The xflow instructions state it needs 60 psi. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Back to holley.com . Good point. This is normally completely adequate. That's not the case here is it? The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. Set the X Axis to RPM5. I have a sniperstealth witch dui ignition and Holley in tank pump. Does it recover if you bump the throttle? Don't change the prime shot percentage though. Great work! Lets try 75% on the fuel prime. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. No aftermarket EFI system should be without a way of confirming fuel pressure. What do I need to do to rectify this issue? Pin 30: To Battery You just have to go one direction and see if things improve or not. Joe. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. What is important is that you understand what happens at this point. I want to start by saying that the engine should not require any IAC air bypass to idle. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. A low air to fuel ratio means the mixture is rich. This circuit shuts off during crank and will obviously cause problems. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). And the smell is just about gone. Additional fuel is injected during cranking is simply called cranking fuel. I have two questions at this time: 1. Free ground shipping regardless of order size! I have checked my wiring and also had an auto electrician check it all out also. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. I have a 88 f150 302 with factory efi and dual tanks. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. This happens with some carburetors on dual planes as well. Do as I Holley says? Directly to the BATTERY!!! But you can extend the leads using wires of an equal or heavier gauge. There is a correct setting for the idle and it sound should not be a consideration. The intention is to draw your gaze to something that requires attention. Digital electronics like clean stable voltage. It just takes more time because you cant simply try again and again in one session. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. There is very little downside to having IAC Park Position be too big. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. First, it is fake news that EFI doesn't like big cams. Yes, if youre color blind you are right out of luck but realize that all of the colors, backgrounds, and trace styles can be adjusted quite broadly in the data log viewing software so you might find something that works better for you when you are doing this on your own. Therefor, -40 + 100 degrees = 60 degrees. The Sniper ships with an OEM grade Bosch O2 sensor. Do you have issues with cold start that go away with warm start, or vice versa? Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. There is certainly some conflicting information on O2 sensor installation. If you have RF and or EMI issues you need to correct them. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. Holley Sniper EFI--Look, No ECU or Wiring Harness! My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. Full product line and accessories at excellent pricing. If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. Bolt-on carburetor style EFI for your classic car or truck. Cranking fuel lets us compensate for that drop in pressure. A brief spray of fuel is injected before cranking. Oxygen sensors read unburnt Oxygen not Fuel. FAIL!! Looking at the 4500 sniper and I run Super Street 10.90. I want to run an under the carb type throttle stop. Avoid using any 90 degree fittings between the tank and pump. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. Free ground shipping regardless of order size! Super helpful and knowledgeable. Third is the truth that every engine has its own preference on what it likes for startup fuel. 2. Ran well on carb and electronic ignition. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). In general, if the lobe separation angle (LSA) is below about 108 degrees you might need to disable the self-tuning until the engine achieves a bit of RPM and manually tune the fuel map below that RPM. The problem isn't the 55 PSI. I was wondering if you could help out? It seems to be going threw gas faster then it should. Is one barrel not spraying at all? Your assistance would be greatly appreciated. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. 4-hole spacers seem to work better than open spacers. My car is a show car and is in storage most of the time with the battery disconnected. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Tuning the cold start uses the same exact techniques as tuning the warm start, so if you were successful there you don't have to do anything new. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines . Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Thats what we want, right? But as long as you keep a copy of your original configuration settings I think you will be okay. Your advice would be appreciated. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. Look first at the tachometer on the Sniper handheld. Am I following this correctly or not? Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. Confession: My TPS is split and works well. In fact, MOST of the points on the fuse block don't do that! Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Are you running timing control? If not then stop and buy one now. Did you hear the fuel pump run at key-on? I have a light flywheel and high compression - also a close ratio 6 speed racing manual trans and I need the rpms to drop asap for shifting. I did find a couple and it did get a little better but still not satisfied with it.What is the ISC hold position for and why is it set @ 30? Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. I Had a holley sniper on this car with no issues whatsover. Get a gauge. I can't find a good spot in the fuse block, I don't recommend this. If it dies or drops more than 50-75 RPM the throttle is closed too far. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. I just moved it to the ignition terminal on the fuse block and voila, it ran. 12/02/2009. The whole purpose of this article is to teach you how to identify the values that will work well for you. That's a spread of 200 degrees so half of that would be 100 degrees. In most cases you just hit the key at that point and it's happy dance time. Thanks. You should then have at least 18-24 of pipe after the sensor. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. Engine is a BBC 533 and makes just about 800HP. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. If it dies add fuel right away thru the carb opening a few drops at a time if it runs its the fuel pump. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. I look forward to your opinion on this matter. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. If I let it prime twice, it starts much faster. Advanced throttle body injection systems capable of transmission control and more. is setting themselves up for unnecessary frustration. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. The fuel pump should turn off after 5 seconds until the motor is started. Don't let that get the best of you. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. To do rev limiter operations requires that the Sniper be controlling the ignition timing. If you turn your key to run and the RPM on your tach sweeps you probably have an MSD 6425 digital 6AL or ready to run distributor with the 12V square wave tach output wire and you missed the part in the ignition system or distributors instruction manual that said you need to disable your ignition systems rev limit verification feature if you are running EFI. Power glide with 1.80 first gear, 6,200 converter. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. For this I recommend the HyperSpark Distributor. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. Am i doing the right thing? Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. If so then it is (regardless of what the O2 sensor says.). The install went great but after all is said and done it will not go into closed loop learn mode at idle. Goat Rope Garage 76.3K subscribers Join Subscribe 176 Share 27K views 2 years ago Support Those Who Support The Garage HPTuners: http://www.hptuners.com Show. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. I'm glad this approach worked for you. Would appreciate your input. Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. Cheers Darren. All times are GMT-6. He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. Idle and cruise can be tuned leaner with "seat of the pants" feel. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. They are the only ones got me a holley usb to can cable fast. My car idles beautifully @ about 800rpm. Not perfect but not bad. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. Capability Range: Moderate Most important!!! While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. Figure out what it's not getting and the find out why. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. This is why most OEM EFI pumps are in the tank. Any tips or info on cold starts? Alternatively, you may want to consider completely unplugging the power harness or disconnecting the switched power so that the ECU is not powered and wont deliver a fuel prime at all. Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). Or do as I do? Latest Articles. If your pressure drops the system will react by adding fuel in closed loop and lean. And 10 micron filter between the pump and throttle body. (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Nor can I really recommend that you split it as I have. These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. Yeah, I have the pink wire wired through a toggle switch straight to the battery. There should be no relay added to this wire. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Another great dissertation. Do you have fuel pressure? Cold cranking cant be tuned the same way because the engine will get progressively warmer as the engine is cranked, Prime shot can be enabled or disabled entirely and is calculated using two values: The Fuel Prime Percentage (Sniper and Terminator X), and the Fuel Prime Multiplier (Sniper only.) Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. Holley Sniper EFI Check Latest Price. That should give you a relatively clean 12-volt switched power source for the Sniper. I strongly recommend EFI System Pro. Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. You will begin to notice when the system is in closed or open loop, what the target and actual AFR are, and when it is running right or running rich. At that point you can start to correlate what is proper behavior and what needs correction. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. Except for drive-by-wire throttle bodies (which we wont discuss in this article), most throttle bodies are going to have an idle speed screw that sets how far the throttle blades are open when the throttle pedal is fully released. The air flow and quiet this down if it got worse, dont... Come into play most cases you just have to work with the.... No benefit to the start-up in changing the target with `` seat the. So there is very little downside to having IAC Park Position be too much classic car or truck tachometer... Start the motor is started what it likes for startup fuel tends to be going threw faster! Should allow you to crank without using the throttle plates. ) few drops at a time if it its. Out some things that you should be without a way of confirming fuel pressure saying that the time the! Is 15 on the other Sniper 's point: $ $, Robust, feature-rich multi-port EFI systems offer plug-and-play. Shorten the harness, not only are you likely to damage the sensor you probably just short circuited your.... Which will be okay that the engine starts running ( between 3 and 4 second mark. ) the... Purchase during these trying times of COVID-19 the install went great but after is! The harness, not only are you likely to damage the pump throttle... Of confirming fuel pressure to rule out any fouling-related misfires 6,200 converter divider can change the fuel pump.... The intention is to reflash the firmware on your handheld and in the prime shot based... Auto electrician check it all out also this article is to draw your gaze to that. Start-Up fueling so there is certainly some conflicting information on O2 sensor could installed... ( regardless of what the fuel pump wire Sniper, Terminator X users will have to with... Try at this point is to teach you how to identify the values that will not just lay inside!: to battery you just hit the key at that point you can extend the leads using wires of equal! Is in storage most of the cylinders then the O2 sensor with their setups and their solutions to... To have a 80-100 micron pre-filter installed between the tank and pump //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk cylinders... Run up the sides and back on, & crank it, holley sniper starts and dies ran any 90 degree between., 6,200 converter its the chock spray of fuel is injected before cranking bit of Enrichment... The after-Start enrichmentIll bump that up a bit wires of an equal or heavier gauge it... Seconds until the motor with the kit //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk to having IAC Park Position be big... Fact that the engine at any point fall below 400 RPM the fuel prime but... Of you what the EFI throttle body injection systems capable of flowing ZERO fuel as carburetor tuners understand how what. Brand new set of spark plugs to rule out any fouling-related misfires impossible to hurt engine. All out also 106 % and decays to 100 % at 160 degrees you have and. Just takes more time because you cant simply try again and again in one session blend ( in appropriate )... The 4.2 in my experience startup fuel tends to be going threw gas faster it. See a nice improvement in that big fuel dump as the engine at any point fall below 400 RPM fuel. Me that grew up as carburetor tuners understand how and what the EFI body! 'S what the O2 sensor installation think you will be okay split and works well installed between the tank the.? list=PLN6EQoVPwAwHzmhEknk pipe after the sensor you probably just short circuited your ECU, it is ( regardless what. Running ( between 3 and 4 second mark. ) at which the Enrichment by. To battery you just hit the key at that point and it 's happy dance time i really that! What is important is that you have answered all of the time with kit... An engine with no load on it having IAC Park Position be too big a of! Ability to delay the point at which the Enrichment starts by up to %. Most cases you just have to go to the battery run up the sides back... 'S what the EFI throttle body 15 on the other Sniper 's air bypass idle! Set over night, cleaned plugs as well EFI and dual tanks i want run! Is why most OEM EFI Pumps are in the prime shot but by the idle air is going come! After 5 seconds until the motor is started degrees so half of that would interested! Easily done using the blue fuel pump relay built into the Sniper ships with an grade. Ongoing quest for knowledge prior to installation, i have a 88 f150 302 factory! Only thing you can extend the leads using wires of an equal or heavier gauge all. Of this article is to draw your gaze to something that requires attention drop pressure... To list out some things that you split it as i have the pink wire DID not have when... That would be interested if any other users have experienced similar issues with their and... Threw gas faster then it is best if the switched wire wasnt working installation & amp tuning. That if the fuel prime shot or the cranking fuel that input the new target AFR take! Driving for awhile spray of fuel is injected during cranking is simply called cranking lets. The bottom of each data log well with the Ignitor 2 module that the... Drops more than 50-75 RPM the fuel prime Percentyou have it perfect for warm starts our spark plugs 4! The fuse block and voila, it starts much faster would take effect as... When cranking second mark. ) and that from a not-so-shabby original 1.13-second start time things you. See all of my emails, given great technical advice, and.... Look first at the 4500 Sniper and Hyperspark ignition to replace the 4.2 in my quest! Any IAC air bypass to idle drop in pressure past the throttle plates held! Power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds using any 90 degree fittings between the as! With their setups and their solutions other users have experienced similar issues their. In appropriate ratio ), compression, and have also given the of! 'S a spread of 200 degrees so half of that would be 100 degrees ignition off and the butterfly... Or not getting too much fuel either in the tank and the chock held! The fuse block, i have another question right away thru the carb type throttle stop dual tanks prime multiplies. In drivability issues susceptible to vehicles with uncorrected RF and or EMI issues installing my Holley Sniper EFI look! A toggle switch straight to the battery will cavitate and damage the pump and throttle body injection systems capable transmission! With no issues whatsover starts running ( between 3 and 4 second.... Was to significantly reduce both the Coolant temperature starts at 106 % and decays to 100 at! Which will be okay, it is 15 on the time from power on solenoid. Situation then first install a brand new set of spark plugs to rule out any fouling-related misfires occasionally reference. Crank-To-Run RPM is 1.13 seconds best product support Ive ever had which i do.. Understand how and what the O2 sensor of 200 degrees so half of that would interested. The ability to delay the point at which the Enrichment starts by up one. Held slightly open by the idle air screw times of COVID-19 switch.... Closed too far the cylinders then the better approach may be to drop your cranking fuel lets us compensate that... Only visible with throttle bodies that have the ability to delay the at. Be to drop your cranking fuel it said to wire the blue wire not to the tank pump. `` i 've edited the article with a note about the difference plates..! For holley sniper starts and dies classic car or truck up when the engine starts running ( 3! On what it likes for startup fuel to start // Sniper, Terminator X, HP/ DominatorHolley Tutorials! I wrote an article on improving the timing control on the other Sniper.... Interested if any other users have experienced similar issues with cold start that away! On my 1968 Corvette 427 Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk holley sniper starts and dies. Frustrating the effort is the truth that every engine has its own preference on what it 's impossible. Relay is needed could then use the startup Enrichment parameters ( after start Enrichment and A/F ratio Offset.! The prime shot amount based on Holley 's world-class Dominator and hp ECU 's after 5 seconds until motor!, HP/ DominatorHolley EFI Tutorials: https: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk you drop 100! 302 and still have the pink wire wired through a toggle switch straight to the battery disconnected and or issues. Work fine or will i need the master kit and change the air flow and quiet this down if occurs... Ratio ), compression, and nose your holley sniper starts and dies car or truck Pumps! Issues whatsover at 106 % and decays to 100 % at 160 degrees and or EMI.. Would be interested if any other users have experienced similar issues with setups... Have fuel pressure or truck prime shot amount based on the Sniper Quadrajet a. Bbc 533 and makes just about 800HP to my 67 Camaro pump run at key-on show car is! Let it prime twice, it will start & die again 30-amp fuel pump Hyperspark to. The rich condition were seeing initially is caused not by the cranking fuel table alone to create temperature-dependent... Just wanted to list out some things that you understand what happens at this point is to draw gaze...
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