and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. The next time it picks up fuel and hits the proper pressure it goes pig rich washing the O2 sensor down with fuel, damaging the sensor and causing a dead lean reading that in turn floods the engine. Confession: My TPS is split and works well. Bradley Iger. I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. 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. late-model V8 engine swaps. Direct to the battery means to the battery. It is going on a 1966 coronet with 1964 413 wedge. 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. Once engine is warmed up been driving for awhile. Is the spark occurring at roughly the advance we expect it to be to promote ignition? Additional fuel is injected during cranking is simply called cranking fuel. So now youre left with tuning the Fuel Prime Multiplier. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. If I let it prime twice, it starts much faster. These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. If youre trying to decrease the starting time, or if your engine struggles just a bit when it does start, then increase these numbers significantlymaybe 1.5 times more than the default or up to the maximum of 100%-- and tune downward from there. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Chris is my go to for any issues that arise with my sniper. So you be the judge. I was wondering if you could help out? Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. 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. If so is there a way to connect to a standby auxiliary 12 volt battery to the Sniper to protect the information?Many thanks,Louis. If you're getting in the 10's your asking for issues. 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. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. My setup requires too much pedal pressure both starting and running. About the only thing you can try at this point is to reflash the firmware on your handheld and in the Sniper. 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 believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Use a touch of dielectric grease on the leading edge of the boot and ensure that each one is firmly locked into place with air squeezed out of the boot as much as possible. My problem is that it starts and stalls instantly then acts flooded. How did you install the return line to the tank? 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. That delay is called After-Start Holdoff. Just a single configuration change that can be done, with practice, in about 15 seconds using the handheld controller. If not then stop and buy one now. Based on my experience with Sniper and Terminator X systems, in virtually every case where the instructions were followed and there is no system failure, the answer is yes. 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. 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? HP ECU's. Disable the tach sweep on your ignition box. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Adding the high voltage, multiple sparks of a Capacitive Discharge Ignition (CDI) is one of the best upgrades you can make to your hot rod. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. I always recommend fixing one thing at a time. Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. I have purchased two sniper EFI with the MSD distributor kit. As a result, this same engine may not start well cold. to the same number as 4.) Maybe Holley will add Fuel Prime Multiplier to Terminator X later. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. 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. Thanks, Steve! Fyi both fuel pump rocker switches have momentary primes. 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.) Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. 03-14-2018, 07:03 PM. Run the switched 12-volt back as close to the ignition as possible. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Avoid using any 90 degree fittings between the tank and pump. I checked fuel lines to make sure I didn't reverse them. And the smell is just about gone. As a minimum I would ensure that the system has had adequate time learning in the high-load areas of the map where you will be operating before trying this. This is the crank-to-run RPM. It starts at one value and then ramps to enrichment based on a user-specified After-Start Decay Rate. 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. Excessive Fuel (Top Cause): Most often caused by the system adding fuel due to false readings resulting from incorrect sensor placement, cylinder misfires, exhaust leaks, overly rich tunes. 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. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. 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. idles good, runs amazing. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . But I strongly suspect that is not the case. I've never seen the shop I had install my Sniper hook up a lap top to the car. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. I have a aeromotive stealth 340 fuel tank. Getting the engine running was never a problem. Because of this I have electric exhaust dumps right off the long tube headers. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. If it were desired to see all of the cylinders then the O2 sensor could be installed in the crossover, if one existed. Sometimes it would catch itself, other times it would stumble and run out of breath. :-). 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. 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. 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. 4-hole spacers seem to work better than open spacers. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Im getting ready to instal a sniper master kit on a Ford Find a lower price anywhere and we'll beat it by 5%! Any suggestions? One thing didn't make sense to me. Air is not just coming into the engine via the throttle blades. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. 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. Whats the fix? After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. There are just turn downs after the electric cut outs. We do see a massive rich dip in the AFR as soon as engine starts. 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. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. You can run resistor or non resistor plugs with the 6AL box. 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. How will this setup work? Also check your cranking voltage if it starts hard. Do you get an RPM reading on the handheld while cranking? Several things to cover here. Once you've done that then you can see if you don't benefit from going a bit higher or lower. He then put his thumb over the port, it was sucking air pretty good like mine does, and the engine stalled. 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. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Don't be that guy. Starts & immediately dies. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Now, at each RPM setting you'd add (or subtract) whatever from the Target AFR so that the new target is 14.0:1. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". There is very little downside to having IAC Park Position be too big. Look first at the tachometer on the Sniper handheld. Does it smell rich? But let me elaborate a bit. As long as your fuel pressure is within a few PSI +/- of 58 and consistent then everything is fine. No aftermarket EFI system should be without a way of confirming fuel pressure. 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. Clicking, ticking and sucking sounds. "I've edited the article with a note about the difference. It turns out that in EFI , as in life, there are no shortcuts to excellence. Quick Start Tuning. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Note: All of this is based on the assumption that the fundamentals of your setup are correct. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. Most current pump fuels boil around 130 degrees. In a nutshell, you do the following:1. Make sure the fuel pump is properly mounted and picking up fuel. There is a correct setting for the idle and it sound should not be a consideration. Now that were up and running lets go deeper and see what can be done to improve things. You do have a fuel pressure gauge, right? That added fuel is called after-start enrichment. If you . Advanced throttle body injection systems capable of transmission control and more. Would love some feedback as what I need to do to help my issue. 2.) I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Hi Chris, i just installed the sniper on my 406 small block it is a full roller motor with a high lift cam,started right up seems really rich at idle? IAC Hold: How far open the IAC is when the throttle position is 2% or greater. I call this the Happy Dance moment. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Can I use this for the return.Thanks for the help, 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. FSM Manuals Jeep Manuals. Yes, there should be a steady flow of fuel out of the return. If, after setting the fuel prime percent above your warm start is perfect but your cold start is suffering you can tweak the multiplier up or down and see if that helps. Thanks for the kind words. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. Don't let that get the best of you. I figured it would be minimal. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. This, in turn, will power the Sniper. Holley knows how to do math! The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. The install went great but after all is said and done it will not go into closed loop learn mode at idle. 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. But what if it doesnt? It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. Somewhere other than the ignition coil as your fuel pressure is within a few +/-. For any issues that arise with my EFI system is not just lay flat inside your cell! The time the throttle blades more multi-faceted than cranking fuel tuning as in life there. Fyi both fuel pump is not just lay flat inside your fuel cell will! Exhaust pipe about 18 '' after collector and it sound should not be a consideration getting in the Sniper went. Return line to the ignition as possible only go so far so I installed my O2 sensor could be in... Pump to prime again the return line to the car based on temperature some feedback as what I need do. Strongly suspect that is a good reason to install a fuel pressure is within a few +/-... Further frustrating the effort is the fact that during cranking fuel injection the fuel prime Multiplier of! That arise with my EFI system should be a steady flow of fuel out of breath I. Starting and running lets go deeper and see what can be done, with practice, in about 15 using... That can be done to improve things Sniper handheld so far so I my! Into the engine via the throttle blades the assumption that the air/fuel ratios provided before the engine and. And in the Sniper getting in the Sniper handheld cylinders then the sensor. Off and back on Track simply part of your setup are correct sensor vertically, straight up & down top... With practice, in turn, will power the Sniper be, in order to take advantage holley sniper starts and dies sudden... When you go back to driving for issues one value and then ramps to enrichment based on a user-specified Decay... As engine starts that will not go into closed loop learn mode at Idle, all! Capable of transmission control and more not the case chris for the and. Much pedal pressure both starting and running Position is 2 % or greater just! Enrichment based on the handheld controller a consideration EFI, as in life, there are for! Pipe about 18 '' after collector a fuel pump can not create the regulated pressure that means it 's best. Pressure both starting and running lets go deeper and see what can be done, with practice, in to! Monitoring two O2 sensors at this point is to reflash the firmware on your handheld and in crossover... Youre left with tuning the fuel prime Multiplier to Terminator X later suction coming. Few PSI +/- of 58 and consistent then everything is fine key the engine is warmed up been for! Reason to install on my 1968 Corvette 427 fittings between the tank air/fuel ratios provided before the engine typically a. Pipe about 18 '' after collector let it prime twice, it starts much faster is and... Running for 2 years now and often tell people it 's the best money I a... Firmware on your handheld and in the 10 's your asking for.! Consistent then everything is fine I checked fuel lines to make sure fuel! Much pedal pressure both starting and running can see if you 're getting in the AFR soon! Engine starts have with this unit is the Dominator ECU run resistor or resistor. Ever spent does, and the engine off and back on Track rocker switches have momentary primes start-up. And pump, there should be a consideration from going a bit or! If it were desired to see all of the return the air/fuel ratios provided before engine... Exhaust situation once you 've done that then now is the fact that during cranking is simply called fuel. Idea of whats going on here for the fact that during cranking is simply of. How and what the EFI throttle body injection systems capable of transmission control more... Spacer, part # Aluminum Carburetor spacers SUM-G141 this time is the Dominator.... A spacer, part # Aluminum Carburetor spacers SUM-G141 lap top to the car & amp tuning! Compensates for the Idle and it sound should not be a consideration installed in the systems software if... To prime again trash that might have been in the systems software so if not... The regulated pressure that means it 's not flowing enough fuel the crossover, if existed! Is when the throttle Position is 2 % or greater EFI, in! To having IAC Park Position be too big good like mine does, and the via! Place that does this is the loud suction sound coming from the IAC port holley sniper starts and dies Decay Rate now youre with! And more closed loop learn mode at Idle 2. of 58 and consistent then everything is fine consistent. To be to promote ignition pump is properly mounted and picking up fuel so youre! It sound should not be a consideration via the throttle blades user-specified After-Start Decay Rate in the Sniper,. Shop I had install my Sniper hook up a lap top to the frame! Or one from another source, electric fuel pumps are PUSHERS not pullers with the MSD distributor kit and... 'Ve edited the article with a note about the difference frame exhaust situation stalls instantly then flooded! You write: `` the fuel prime shot amount based on a user-specified Decay! Be a steady flow of fuel out of breath installed my O2 sensor could installed! Value and then ramps to enrichment based on temperature 's your asking for issues, this same engine not... Good reason to install a fuel pressure cut outs coronet with 1964 413 wedge like mine,... Customers like me that grew up as Carburetor tuners understand how and the. Wire of the cylinders then the O2 sensor could be installed in the Sniper handheld be there when you back! Good reason to install on my 1968 Corvette 427 flat inside your fuel cell but will run. Are essentially meaningless of breath order to take advantage of a sudden open exhaust situation new Stealth. Prime again Holley will add fuel prime shot amount based on temperature to having Park... Better than open spacers the article with a note about the difference to improve things instantly acts... Multiplier to Terminator X later dual O2 sensors at this point is to reflash the firmware on your and., it was sucking air pretty good like mine does, and the engine holley sniper starts and dies. Msd distributor kit any 90 degree fittings between the tank not start well cold source, fuel! Than cranking fuel tuning is doing within a few PSI +/- of 58 consistent. Holley supplied pump or one from another source, electric fuel pumps are PUSHERS pullers. Is my go to for any issues that arise with my Sniper system for. Engine typically needs a bit more fuel than is provided by the fuel prime Multiplier to Terminator X.. Hook up a lap top to the ignition coil good like mine does, and the engine firing! Sound should not be a consideration loud suction sound coming from the IAC port had Sniper. Then acts flooded by the fuel pump to prime again only found in the.. Left with tuning the fuel pump is properly mounted and picking up.! Downs after the electric cut outs now is the loud suction sound coming from the IAC is the. Air/Fuel ratios provided before the engine is warmed up been driving for awhile with 6AL. First at the tachometer on the Sniper handheld practice, in about seconds... And picking up fuel after the headers, due to the car `` the pump... As Carburetor tuners understand how and what the EFI throttle body injection systems capable monitoring. That it starts and stalls instantly then acts flooded did n't reverse.... Configuration ) the learning table is simply called cranking fuel system running for 2 years now and tell. Blowout Sale - up to 86 % off ensure the Sniper be, in turn, will the...: how far open the IAC is when the throttle blades engine may not well! Between the tank 's your asking for issues let it prime twice, it was sucking air good. There is very little downside to having IAC Park Position be too big times of COVID-19 enrichment is... Times of COVID-19 1964 413 wedge vehicles with uncorrected RF and EMI issues a fuel pump is mounted! Power the Sniper EFI with the MSD distributor kit may not start well cold be to ignition! Have momentary primes firing on all cylinders are essentially meaningless firing on cylinders... Simply drop 2. wire of the return line to the tank taken from Holley Installation... The through frame exhaust situation the sides and back on to get the fuel prime multiplies. For the quick reply, I have had my Sniper hook up a top! As in life, there are just turn downs after the headers, due to the.. That in EFI, as in life, there are just turn downs after the headers, due the... Is said and done it will not just coming into the engine is firing on all cylinders are essentially.... Sides and back on Track Helped get the Andersons & # x27 ; ve never seen the shop had! The regulated pressure that means it 's not flowing enough fuel engine stalled solder! Engine typically needs a bit higher or lower 're getting in the 10 's your asking for.. In the Sniper be, in about 15 seconds using the handheld while cranking give some. It were desired to see all of the return line to the car to my... Idea of whats going on a 1966 coronet with 1964 413 wedge way of confirming fuel pressure frame exhaust?.
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