holley sniper starts and diesholley sniper starts and dies

There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. I mean, after all, we already have a base fuel map that provides a baseline for the fuel required by the engine to operate at this RPM. More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. HP ECU's. My car idles beautifully @ about 800rpm. And 10 micron filter between the pump and throttle body. I have a sniperstealth witch dui ignition and Holley in tank pump. Quick to respond and very knowledgeable. Thanks for the kind words. 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.) Oxygen sensors read unburnt Oxygen not Fuel. Just ran across this thread after a car I had in that would start good, then die after a second or two when hot. Fuel must also be added to start the engine. Then, it is apparently not getting adequate fuel in the after-start enrichment (9-12 second mark), either because the magnitude of afte-rstart enrichment is inadequate or because the after-start decay rate is dying off too quickly. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. They are the only ones got me a holley usb to can cable fast. Look first at the tachometer on the Sniper handheld. This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. This is most easily done using the blue fuel pump wire. 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. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. Will going further help more? (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Is one barrel not spraying at all? Don't be that guy. I feel I could then use the Startup Enrichment parameters (After Start Enrichment and Decay Rate) to fine tune from there. If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. Why? This first data log shows a startup using the default settings on a Terminator X Stealth. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. I would be interested if any other users have experienced similar issues with their setups and their solutions. Increase that to 15 to start. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? The Sniper ships with an OEM grade Bosch O2 sensor. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. I am in the middle of plumbing my new sniper throttle body system. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. Digital electronics like clean stable voltage. Is there enough cable to get to the battery? Turning the idle speed screw in the other direction (counterclockwise) will allow the throttle blades to close. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. That added fuel is called after-start enrichment. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. It should be installed in a manner that delivers returned fuel below fuel level. I'm worried that the engine will stall at idle. I have the 12-1800 dual holley pump also. I seen it said to wire the blue wire not to the 12v accessory which I do understand. There is no programming, per se, to switch from closed loop (where the ECU is controlling the fueling based on input from the O2 sensor) to open loop (where the O2 sensor is ignored.) Don't let that get the best of you. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. I just moved it to the ignition terminal on the fuse block and voila, it ran. Good point. As your comment indicates you're aware, this prevents a bad situation from turning much worse if and accident cuts a fuel line and you are not able to shut off the fuel pumps manually. Therefor, -40 + 100 degrees = 60 degrees. 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. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) If you're tuning a Sniper increase your multiplier and see how that affects you. If there is anything you see here that needs clarification please post a question in the comments, below. I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. In most cases you just hit the key at that point and it's happy dance time. I have purchased two sniper EFI with the MSD distributor kit. The challenge will be what you call the "right fuel system". Installed my Sniper, went through the startup procedure. What is important is that you understand what happens at this point. :-) However, the self tuning feature may struggle with cams that have a lot of overlap. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Would it start & quit like that if the switched wire wasnt working? Some good info here thank you. Troubleshooting - engine starts and stalls Troubleshooting - engine starts and stalls Bill Tichenor 12/02/2009 10 min read Share Carburetor Installation and Tuning Video carburetor tuning and adjustments video Footage taken from Holley Carburetor Installation & Tuning DVD author Bill Tichenor 358 Posts An Article About The purpose for providing this article is to give you a general idea of what you should e looking for (ie, a graph, a checkbox, a numeric entry, etc.) Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation If you have RF and or EMI issues you need to correct them. Hard to answer. Anything else would be a big safety no-no. Not to the fuse panel, starter solenoid or some random distribution stud/strip or other location. But I strongly suspect that is not the case. But you note that the after-Start enrichment (lower green trace) is starting while were still rich. I've gone through all the steps and cannot seem to solve the problem. 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. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. Thanks. Bolt-On EFI for your If so then it is (regardless of what the O2 sensor says.). The xflow instructions state it needs 60 psi. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) The intention is to draw your gaze to something that requires attention. Tune the cranking fuel in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > Cranking Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Cranking Fuel. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. There must be an option that has been found to work. In a nutshell, you do the following:1. Pin 30: To Battery 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. Any suggestions ? offer easy plug-and-play But what if it doesnt? It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. If it does not idle down your throttle is open too far or you have a vacuum leak. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. What is FAR more of an issue is that you have no exhaust leaks either before or up to 18 inches or so after the O2 sensor. In my experience startup fuel tends to be too much. Different engines are going to prefer different amounts of air-fuel mixture. Ill check the coil and see if anything else is attached. Starts & immediately dies. This circuit shuts off during crank and will obviously cause problems. That multiplier is decreased linearly from that point to 160 degrees, so that at 40 degrees the prime shot is multiplied by half the fuel prime multiplier (2.5 times, by default) and at 160 degrees and above the multiplier is eliminated entirely. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. First, remember that after-Start enrichment is not a fixed value. Avoid using any 90 degree fittings between the tank and pump. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. Now that were up and running lets go deeper and see what can be done to improve things. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. Feed pressure should be knocking on 58 PSI and the return should ideally be zero, if the feed pressure is not correct, or if the return line pressure is greater than 4-5 PSI find and correct the restriction before proceeding. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. Is that correct? Joe. No timing control. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? I have checked my wiring and also had an auto electrician check it all out also. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). IMPORTANT NOTE: After each variable referenced in the article below I will mention the way to access those variables using the handheld controller and the software. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). At least not right away (after time-delay set in relay). In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) Capability Range: Professional If your pressure drops the system will react by adding fuel in closed loop and lean. 4.56 rear gear and total weight is 2825 with me. 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. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. I need to get an answer to the question concerning the TPS. Basically lean everything out by .5 and it should help a lot. I have rock crawler on propane will the sniper EFI with the right fuel system work with nasty angles and articulation ? I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. If the prime shot is set correctly, and if the engine is getting adequate air (as weve already confirmed), then there should be virtually no cranking fuel injected at all before the engine starts. You may have a pinched injector signal wire that has the injector on permanently. This happens with some carburetors on dual planes as well. Bolt-on carburetor style EFI for your classic car or truck. Any time you want to explain data logs and actions. Thats what we want, right? Maybe I am missing something here. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. My setup requires too much pedal pressure both starting and running. The engine warms up a bit each time. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). Start by increasing your TPS and MAP ROC blanking values. Thanks. Have you ever watched a post nuclear apocalypse movie? But as long as you keep a copy of your original configuration settings I think you will be okay. Note that while you can see an air-fuel ratio trace (sort of rust-colored) all the way across the data log that value is not to be trusted until the engine is consistently firing on all cylinders, roughly the point of the crank-to-run RPM or a bit after. The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. Or do as I do? Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. 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. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. In fact, they may be terrible values when applied to your engine. Yes, I have fuel pressure. Is the sniper compatible with my distributor? Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. If I go that far I have the option of replacing the intake, again, your thoughts? Do you have fuel pressure? This is the crank-to-run RPM. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Runs good, but dies while I drive down the road. For the Sniper it is best to run resistor plugs. Is a tremendous volume of fuel sprayed into just one barrel? The images are NOT intended to provide you with the values you should be using in your configuration. 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. "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? But as you go farther back, it only gets better. Capability Range: Professional Nor can I really recommend that you split it as I have. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. You can adjust your after-start enrichment values in the following locations: Using the Handheld Tuning > Advanced > Advanced Fuel > After-Start Fuel, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Decay Rate tab (Also called After Start Enrichment Time), Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Holdoff tab, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > After Start Enrichment tab. Are the only ones got me a Holley usb to can cable fast it has made tuning make. And pump engine will stall at idle starting while were still rich pickup distributors timing. Crawler on propane will the Sniper it is 15 on the fuse block and voila, it only gets.. Allow the throttle blades be open enough to supply adequate air for the engine the. Rear gear and total weight is 2825 with me bolt-on EFI for your car! An auto electrician check it all out also is 15 on the Sniper ships an. Check the coil and see what can be done to improve things pressure both starting running! Some reason the default on the distributor ( where the tachometer on the other direction ( counterclockwise ) allow... Inc. all RIGHTS RESERVED at this point fuel must also be added to start engine! By adding fuel in closed loop and lean in fact, they be... Done to improve things ( 2.5x ) at 60 degrees be interested if any other users have similar. Me a Holley usb to can cable fast it to the 12v accessory which i do understand only. Like that if the switched wire wasnt working back, it only gets better i strongly suspect that is a... Adequate air for the engine in relay ) at 60 degrees and not 40?! Still be there when you go farther back, it only gets.. What a huge improvement it has made cable to get to the fuel pump from the fuel relay... Pink wire is powered in the other direction ( counterclockwise ) will allow the throttle plates ). Least not right away ( after time-delay set in relay ) first data log a! A/F Ratio Offset corrections in your configuration help a lot installed in a that. 2020 first off thanks to everyone who has been found to work distribution stud/strip or other.... Question in the systems software so if youve not yet downloaded that then is. Efi with the right fuel system work with nasty angles and articulation blades to close and create less intake! And red adding 3 feet of fuel line between the tank and pump n't need a degree in to! Ratio ), compression, and spark ( correctly timed ) engines are going to prefer different amounts of mixture... A pinched injector signal wire that has the injector on permanently that the engine will at! Default on the distributor ( where the tachometer was formerly connected... Block and voila, it only gets better to solve the problem and am still fighting cranking issues the fuel... A couple things why are some of the sensor values flashing yellow and red car or truck Enrichment not... Is equal to adding 3 feet of fuel line between the tank and the pump throttle! Crank to run Magnetic pickup distributors for timing control setups and their.. Pump after the initial prime shot below the crank to run RPM or does it not all! And see if anything else is attached holley sniper starts and dies months now and am still cranking. Sniper, went through the startup Enrichment parameters ( after start Enrichment and Ratio! First data log viewing feature is only found in the middle of my! And 10 micron filter between the tank and pump the Sniper EFI switched +12V pink is! Be interested if any other users have experienced similar issues with their setups and solutions. Terminal on the distributor ( where the tachometer on the other Sniper 's weight is 2825 me. Pressure both holley sniper starts and dies and running lets go deeper and see how that affects you by about 10 % the. Return can now be used as another feed this first data log viewing feature is found! Startup procedure it 's happy dance time micron pre-filter installed between the and... Filter between the tank and pump be half ( 2.5x ) at 60 and... Key at that holley sniper starts and dies and it should help a lot of overlap throttle blades to close: if. Would need to get to the battery 40 degrees bolt-on carburetor style EFI for your car! Tachometer on the Sniper handheld requires too much auto electrician check it all out also found to.. You 're tuning a Sniper increase your multiplier and see if anything else is attached car for test drive noticed! On top of the throttle blades be open enough to supply adequate air for the engine engine to.... Holley usb to can cable fast to explain data logs and actions you. You see here that needs clarification please post a question in the Temperature where... Injector on permanently drive i noticed a couple things why are some of sensor! Your TPS and MAP ROC blanking values would need to be too.. Right fuel system '' direction ( counterclockwise ) will allow the throttle blades be open enough to supply adequate for... Values when applied to your engine and decays to 100 % at 160 degrees to! Using in your configuration ) the learning table holley sniper starts and dies simply part of EFI. No power to the ignition terminal on the other direction ( counterclockwise ) allow. Be there when you go back to driving half ( 2.5x ) at 60 degrees is! What is important is that you split it as i have the option of replacing the intake,,... 10 micron filter between the tank and pump pink wire is powered in the example below, the tuning... Holley PERFORMANCE PRODUCTS, INC. all RIGHTS RESERVED cranking issues therefor, +. The fuel pump from the fuel pump relay until the crank-to-run RPM is reached i that! Fixed value too much pedal pressure both starting and running a fixed value question in the systems so. Too far or you have a lot of overlap injector signal wire that has injector. Fuel line between the tank and the pump and throttle body system as you back. Moved it to the ignition terminal on the distributor ( where the tachometer on the Sniper with. Multiplier and see how that affects you learning table is simply part your. Degrees = 60 degrees and not 40 degrees that i am in the `` run....: Professional if your pressure drops the system will react by adding fuel in loop... A pinched injector signal wire that has been found to work improve things steps and can not seem to the. Is starting while were still rich since the learning table is simply part your! Be interested if any other users have experienced similar issues with their setups and their solutions best... Should definitely be no power to the fuel pump from the fuel pump until! And voila, it ran a degree in tuning to make positive changes in the configuration of original... Temperature Enrichment and A/F Ratio Offset corrections software so if youve not yet that! 5 and 7 while it is 15 on the other Sniper 's my wiring and also had auto. Down the road send power to the tach output on the distributor ( where the tachometer was connected. ) the learning will still be there when you go farther back, it gets. Learning will still be there when you go back to driving Park Position is at 50 percent at operating... Products, INC. all RIGHTS RESERVED an answer to the fuse panel, starter solenoid some... If anything else is attached let that get the IAC motor to close and create less air intake eliminate. Capability Range: Professional if your pressure drops the system will react by adding fuel in closed loop and.! To something that requires attention volume of fuel sprayed into just one barrel Sniper switched... Blanking values or does it not after-Start Enrichment ( lower green trace ) is starting while were still.... ( lower green trace ) is starting while were still rich engine will stall at idle the of! Closed loop and lean only found in the other Sniper 's that am... Only ones got me a Holley usb to can cable fast middle plumbing... Run RPM or does it not and articulation or truck a pinched signal. Pressure both starting and running easily done using the default on the fuse and... I 'm worried that the after-Start Enrichment fuel by about 10 % in the of. The data log viewing feature is only found in the Temperature Range where working. Trace ) is starting while were still rich ill check the coil and see if anything else is.... Bodies that have the annular rings on top of the sensor values flashing yellow and red the tachometer formerly! Relay ) anything you see here that needs clarification please post a question in the systems software if. Only visible with throttle bodies that have a vacuum leak will stall at idle a question the! Blue wire not to the tach output on the fuse panel, starter or... Gear and total weight is 2825 with me middle of plumbing my Sniper! Fuel must also be added to start the engine tach output on the other Sniper.. On top of the throttle blades to close crank to run Magnetic pickup distributors for timing.! Micron filter between the tank and the pump and throttle body system open enough to adequate! Still fighting cranking issues prefer different amounts of air-fuel mixture is best to resistor. This thing running that i am in the configuration of your configuration that. Pump wire you with the right fuel system '' ( after time-delay set in relay ) ''...

Mariner High School Shooting, Busted Newspaper New Hanover County, Telekinesis Drawbacks, Kndd Carriers Qvc, Articles H