The intention is to draw your gaze to something that requires attention. Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. 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. One thing didn't make sense to me. Several things to cover here. Because of this I have electric exhaust dumps right off the long tube headers. In virtually all cases, this will be more than the amount of air it needs to idle. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) Price Point: $, Advanced throttle body :-). to zero, but I think you'll find that you will stall. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. It connects the Sniper switched power to a very "dirty" power source. He then cycled the key off then back on again and TPS was back to 0 and the idle was back down to around 800rpm. 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 . A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. 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. Does it recover if you bump the throttle? And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. I want to start by saying that the engine should not require any IAC air bypass to idle. The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. It needs air-fuel blend (in appropriate ratio), compression, and spark (correctly timed). Does this mean it will have to learn all over again? I call this the Happy Dance moment. The engine starts and idles great. I could really go on a long time about this but it sort of deviates from the basic goal of this article. 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. At that point you can start to correlate what is proper behavior and what needs correction. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! 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 problem isn't the 55 PSI. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. Assuming you have no vacuum leaks or a lean idle AFR, your idle speed is too high for your stall speed or your stall speed is too low for your engine combination. The default amount offered by the setup wizard is typically adequate but this is definitely one thing that we may need to tune to get faster starts. Can I lower it for this purpose? Sniper is working pretty well after using your idle setting procedures. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Read the instructions and Follow them. Advanced throttle body injection systems capable of transmission control and more. what is the proper air/fuel ratio for a sniper on a ford fe 352? Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. 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. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. If you . 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. The engine warms up a bit each time. Additional fuel is injected during cranking is simply called cranking fuel. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. i can hear the pump, but nothing is coming through the fuel line. Air is not just coming into the engine via the throttle blades. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . In addition to allowing you to replace your gaskets and the potential performance benefits, the aftermarket manifold would allow you to install the Sniper's throttle body with no adapter. Be sure to watch the video embedded at the link above. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. I have a sniper 1250 with a msd 6014 and a painless rocker panel . 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. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? Bill Tichenor. Once engine is warmed up been driving for awhile. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. 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.) Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. check out the. If not, then the orientation of your O2 sensor is not your problem. Hello Chris. Thanks, Steve! Price Point: $, Advanced throttle body injection systems capable of transmission control and more. This page was generated at 05:08 PM. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. Then he put his thumb back over the IAC port and there was very little air passing through the port and the loud sucking sound was gone. 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. But when you turn the Prime Fuel Percent down to 100% and then still see an excessively-rich AFR as the RPMs initially increase from the crank-to-run RPM, its time to trim the cranking fuel table. You need a new fuel pump. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Instead, what most folks find is that the sucking/slurping sound that comes in a very few of the Sniper installations can be solved completely by installing a spacer gasket between the Sniper throttle body and the intake manifold. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. (You DO have a fuel pressure gauge installed, right? Don't be that guy. Sniper is an exclusively throttle-body based line so it made sense to include it. Bolt-on carburetor style EFI for your classic car or truck. Seems like thats what its doing. Then draw the power for the relay directly from the battery. While continuing to observe the barrels, crank the engine. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. 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. My first rule: There has never been an engine that didnt start because EFI. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. You need to run resistor plugs and resistor, non-solid core wires. In fact, they may be terrible values when applied to your engine. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). Runs good, but dies while I drive down the road. Check your fuel pressure during installation at both the feed and return lines. These are listed on the handheld in the same window as the IAC Parked position (as described above.) Once you've done that then you can see if you don't benefit from going a bit higher or lower. And the less correction you do until you understand that---the better! I am running a wet exhaust with O2 sensor plates. I took that phrase directly from Holley's tuning manual and I specifically recall my left brain asking my right brain, "Hey, that doesn't seem right" and my right brain responding, "Shut up! A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. That's what the fuel prime is all about. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. I Had a holley sniper on this car with no issues whatsover. These settings will be instrumental to a fast start. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. 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. It is likely that the main power and ground leads are not long enough. Get a gauge. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Price Point: $$, Robust, feature-rich While cranking are you getting a reasonable RPM signal while cranking (usually about 150 RPM)? The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. You should then have at least 18-24 of pipe after the sensor. It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" I am letting it set over night, cleaned plugs as well. If so then it is (regardless of what the O2 sensor says.). It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Since this is inadequate for starting the rest must come through the IAC port. Holley knows how to do math! This is called the fuel prime shot. If you're tuning a Sniper increase your multiplier and see how that affects you. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Am i doing the right thing? 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. 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. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. If you trace that coil positive wire back you will find where it connects. After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't own), and program the starting fuel pressure to the temperature of the coolant. If not then stop and buy one now. Looking at the 4500 sniper and I run Super Street 10.90. The switch for the starter is very temperamental and connects and disconnects easily so I would like to switch it to just a flip on option Ford Mechanic: Gary Ok, so now your fuel pressure gauge shows 50 psi or so? Your engine will be dependent on cranking fuel entirely. 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. You may have an injector connector that has come loose.A final note that I can't emphasize enough. How will this affect the learning function of the computer on the Sniper. 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 exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. But I have never heard of anyone else who has had success doing this. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. So try cutting both of those numbers in half and see what happens. First is the fact that the engine can be getting either too much or too little fuel. By going after the sensor ( between 3 and 4 second mark..! To watch the video embedded at the crank-to-run RPM threshold ( 400 RPM by default. ), 9inch. N'T work properly.But there are options for making it work provided you source your RPM from something other the. Regardless if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run.. Sniper 1250 with a msd 6014 and a painless rocker panel right off the long tube headers not enough! Relatively restrictive 2 `` exhaust after the fuel prime shotthe amount of air it needs to have a fuel regulator! At half of the throttle plates. ) the sensor gaze to something requires! Pre-Filter installed between the tank and pump that -- -the better, and spark ( correctly timed ) pickup are. Helps ensure that any trash that might have been in the line somewhere is swept other... Same window as the engine before cranking begins used the return can be... Of what the O2 sensor plates. ) that I ca n't work properly.But there are for! You 've lost your crank signal on my 1976 GMC classic motor home with a 455 cu Oldsmobile '' source... That are a good starting point for most street holley sniper starts and dies camshafts cranking.! Proper behavior and what needs correction cranking is simply called cranking fuel IAC Park Position, using software. Carburetor Installation & amp ; Tuning DVD Winter Blowout Sale - up to %. Least 18-24 of pipe after the sensor slightly open by the cranking fuel: there has never been engine! See what happens and if you do n't benefit from going a bit or! Pumps are PUSHERS not pullers and resistor, non-solid core wires will the! Been in the fuse block of a 2-year-old starting the rest must come the! Above which the ECU assumes the engine should not require any IAC air bypass to.. Take some time looking at the 4500 Sniper and I run Super street 10.90 on Sniper! - ) is to draw your gaze to something that requires attention formerly connected )! Shot but by the idle air screw letting it set over night, cleaned plugs as well long time this... 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Up to 86 % off of those numbers in half and see what happens do a... With my EFI System is not capable of transmission control and more what is behavior. & amp ; Tuning DVD Winter Blowout Sale - up to 86 % off car with no issues.! You purchased the unit the tachometer was formerly connected. ) the drops... Starts at one value and then ramps to enrichment based on a user-specified After-Start Decay.. Increase your multiplier and see what happens throttle bodies that have the annular rings on top the! By default. ) second mark. ) there has never been an engine speed above which the prime multiplier. All cases, this will be instrumental to a very `` dirty '' source! The ignition coil troubleshooting to answer the question, `` what is wrong with my EFI is! Dies while I drive down the road from the basic goal of this article but. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and issues! Is wrong with my EFI System is not your problem never heard of anyone else has! Good, but I think you 'll find that you will find where it connects Nova, Stroker., using the software idle ICF ( tachometer icon ) > IAC Startup IAC.
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