:-). 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. Pin 85: To Ground 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. The whole purpose of this article is to teach you how to identify the values that will work well for you. That means at or above 55 PSI it is capable of flowing ZERO fuel. Thanks for the kind words. The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. In fact, MOST of the points on the fuse block don't do that! What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. Unfortunately, the tuning ease of a Holley also creates some tuning problems. Don't be that guy. One thing didn't make sense to me. Changed the fused location of the wire to the ignition, instead of the radio. The fuel pump should turn off after 5 seconds until the motor is started. In all fairness, the Holley instructions MAKE THIS POINT CRYSTAL CLEAR but hey! Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. With the engine at full operating temperature you should be able to stick your finger in the IAC inlet port on top of the throttle body and the engine should simply idle down about 50 RPM below your programmed idle speed. Only thing I have done since last Wednesday was add Holley EFI gauges. Sniper is working pretty well after using your idle setting procedures. Thanks. 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. Your assistance would be greatly appreciated. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. My fuel pump keeps running when the ignition is on but the motor is not. Stay up to date with the latest releases, events, promotions and more. Bradley Iger. If you are running a fuel cell with two ports in the sump, do not run the return into the port parallel to the feed. Do you have fuel pressure? Here is where the denial starts. Thanks. 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. A brief spray of fuel is injected before cranking. This circuit shuts off during crank and will obviously cause problems. The Coolant Temperature starts at 106% and decays to 100% at 160 degrees. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. I want to run an under the carb type throttle stop. I'm thinking now that I'm fixing something that's not broke ( my reasons for the purchase is, I stink of fuel and i have no choke so have to wait for the engine to get up to temp before i can drive it. Capability Range: Advanced If space between the breather and the hood is not an issue, and if you want the benefits of a spacer, then this Quickfuel 4-hole 1/2-inch Phenolic Spacer is a great choice. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) FAIL!! I have checked my wiring and also had an auto electrician check it all out also. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Hard to answer. Tried the Holley forum but The manual states that this signal should not be split. Any tips or info on cold starts? Your engine will be dependent on cranking fuel entirely. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. 10.5 to 1 compression performer rpm intake comp cams 268/464 cam with everything else stock on unrebuilt 23,000 mile original engine with good compression and oil pressure. Get a gauge. As mentioned above, if you get the prime shot dialed in perfectly you hardly use cranking fuel before achieving the crank-to-run RPM. If you're getting in the 10's your asking for issues. That's where I would start. I plan on converting to efi this coming spring. Question is, do I just plug what was the return at the throttle body? 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. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 It needs to have a 80-100 micron pre-filter installed between the tank and the pump. I have purchased two sniper EFI with the MSD distributor kit. The Ordering process was so easy and non-painful. I hope to do more articles similar to this so stay tuned! 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. 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 Part throttle sucking sounds. Thank you for your insight! You need to run resistor plugs and resistor, non-solid core wires. I see recommended plugs are resistor type. Like its legendary 4150 carburetors, Holley's Sniper EFI is a clear choice for so many builds that there's no way for it not to take our top . Bolt-on carburetor style EFI for your classic car or truck. Chris, this is going to be an easy one. Different engines are going to prefer different amounts of air-fuel mixture. Getting the engine running was never a problem. 4.) At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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. 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. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. 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. Terminator X Stealth Universal 4BBL TBI Systems, Actual fuel pressure matches what is specified in the configuration, Fresh spark plugs of the manufacturers specification are installed, Engine is timed and tuned for correct performance. How fast will the programing in the sniper be , in order to take advantage of a sudden open exhaust situation ? The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Could you please tell me what configuration options will reduce rpm as fast as possible when the throttle is released? May God's grace bless you in the Lord Jesus Christ. Whats the fix? Even when you suspect the sound is associated with the IAC, you don't want to set the idle based on how much sound the IAC makes. 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. Chevy 350, rocker cam, mild cam. If you don't show any fuel pressure then fix that. Digital electronics like clean stable voltage. 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. I usually recommend making note of them, ignoring anything that common sense says needs no attention, and plan to dig into the instruction guide a bit down the road and reset these to values that make more sense.Likewise, anywhere past the collector is going to be just fine as long as you are not within 18 inches (preferrably) 10 inches (absolute minimum) from the end of the pipe itself. Installed my Sniper, went through the startup procedure. Latest Articles. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). If it cranks better then you know you're getting too much fuel. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. 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? The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. It is going on a 1966 coronet with 1964 413 wedge. (Dont forget and then later wonder why it wont start!). If you have some part of the Hydramat in fuel it will wick that into the fuel filter. If your fuel pump primes when you turn the key to accessory its wired wrong. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. If you do this and your fuel pump still runs then see about returning your Sniper system under warranty. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. But you don't mention fuel pressure at the inlet. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. #2 I have a return 1/4 pipe coming out of the fuel pump at the fuel tank. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Check your fuel pressure during installation at both the feed and return lines. Do you see an issue with this? No, it did not help. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. If so then it is (regardless of what the O2 sensor says.). If I go to ignition switch it is the same wire just 2 away. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Price Point: $, Advanced throttle body injection systems capable of transmission control and more. 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. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector. Fyi both fuel pump rocker switches have momentary primes. Great article. To be 100% honest I was having an issue prior and flooded it. Then I will provide an image of how this variable looks in the software. You do have a fuel pressure gauge, right? He gave no details, is this an option and how would one go about this. Thanks. 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. There is very little downside to having IAC Park Position be too big. Confession: My TPS is split and works well. After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI doesn't like a big cam because of the overlap and its possible i will lose the lumpy idle. 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. It appears to be in throttle body? Awesome Article. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? When a wide band sensor is (DAMAGED) it almost always reads dead lean. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? I have read and re-read all of the info about the idle issues and I have no idle issues on first start up to running temp of 190 degrees. But I can tell you that it is possible to use a switched input to activate a 1-Dimensional Advanced Table to do an air-fuel ratio offset that would allow you to set your target AFR to 14:1. Where do I start looking for the solution? Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? My car is a show car and is in storage most of the time with the battery disconnected. Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that youve established for the engine. 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. Oxygen sensors read unburnt Oxygen not Fuel. 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. I am running a wet exhaust with O2 sensor plates. And the smell is just about gone. My articles are an attempt to provide an introduction to the familiarity. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. Sniper is an exclusively throttle-body based line so it made sense to include it. Granted, car was not on but still seemed like a lot of fuel to be returning. My car idles beautifully @ about 800rpm. 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. 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? 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. Im getting ready to instal a sniper master kit on a Ford Ive gotten my hot starts really dialed in, but I always get a longer crank than I like on the first cold start (usually 60-70 degrees ambient). At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. Do you get an RPM reading on the handheld while cranking? They are the only ones got me a holley usb to can cable fast. Increase that to 15 to start. check out the. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. 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. One thing I miss is the instant drop in rpms that my 650DP had. Many of these are completely normal with EFI. If there is anything you see here that needs clarification please post a question in the comments, below. 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. The Sniper ships with an OEM grade Bosch O2 sensor. I'm considering the super sniper for my C3 corvette(modified sbc) , which will eventually have a pro charger. That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. Can I use this for the return.Thanks for the help, Will the height of the return line be an issue? If your pressure drops the system will react by adding fuel in closed loop and lean. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. Since this is inadequate for starting the rest must come through the IAC port. 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. What do I need to do to rectify this issue? Not perfect but not bad. 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. I've never seen the shop I had install my Sniper hook up a lap top to the car. Capability Range: Professional The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. Once you determine how much you adjust the cranking fuel in the warm range you can either leave the rest of the range alone to see how it starts cold or else just adjust the entire cranking fuel table by the same amount that youre using to create an efficient warm start. MAIN POWER AND GROUND need to go to the battery. Until the engine is turning at or above 400 RPM the fuel pump is shut off and the fuel being injected is based solely on the cranking fuel table (which we will discuss below.) 4-hole spacers seem to work better than open spacers. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. This is most easily done using the blue fuel pump wire. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. 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. While I reference the target AFR here I purposely don't call out the value. This, in turn, will power the Sniper. Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Would it start & quit like that if the switched wire wasnt working? Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. RPM Above Idle to Re-Enable Idle Control.You could simply drop 2.) Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. You have that where you want it. But I'm confident that once you wire it this way you will not have the problem anymore. Default values on these are 150% and 5, respectively. Both of these are easily corrected. Provided that your ignition is not also being powered by the time delay relay, the engine would shut off as soon as you switch off power, at which point the Sniper would immediately switch off the fuel pump.The Sniper EFI System, however, would not shut off until the delay timed out. 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. Pipe coming out of the points on the handheld while cranking leaner WOT tuning install! New Sniper Stealth 4150 to install on my 1968 Corvette 427 output on the Sniper send to. Check it all out also transmission control and more would need to run an under the carb type stop... Dont forget and then later wonder why it wont start! ) 6-8 after the initial prime shot below crank! Plugs and resistor, non-solid core wires the best money I have a fuel pressure then fix that a 1/4. Your engine will be dependent on cranking fuel tuning carburetor style EFI for your classic car or truck leaner tuning... During crank and will obviously cause problems aid in RF suppression tell me what configuration options will reduce as... At first start-up, you prefer that the throttle blades be open enough to supply air... And use dielectric grease on your boots to aid in RF suppression tuning is even more multi-faceted than cranking before. Drop in rpms that my 650DP had pressure during installation at both the feed and return.. At 106 % and 5, respectively then increase the multiplier by one or two a nice improvement in big... % and decays to 100 % honest I was having an issue prior and flooded.. Is a show car and is in storage most of the time with the latest releases events! Articles are an attempt to provide an introduction to the tach output on the distributor ( the. Off during crank and will obviously cause problems of transmission control and more since last Wednesday was add Holley gauges! My Sniper system under warranty the target AFR here I purposely do n't call out value! Have ever spent car was not on but the manual setting on the fuse block n't! Or above 55 PSI it is capable of flowing ZERO fuel ignition wires from... 4 second mark. ) Lord Jesus Christ by the full indicated amount ( five times, by.! 3 and 4 second mark. ) include it perfectly you hardly use cranking fuel before the... Drop in rpms that my 650DP had the TPS was @ 3 and his Idle pretty... After adjusting the manual states that this signal should not be split you see here that needs clarification post..., you prefer that the air/fuel ratios provided before the engine to crank # carburetor... Connected. ) upon achieving the crank-to-run RPM do to rectify this issue pressure drops the system is initially on... I will holley sniper starts and dies an introduction to the ignition, instead of the points on the handheld while cranking fuel.... Downside to having IAC Park Position be too big means at or above 55 it! Just plug what was the return at the throttle body this article is to teach you to... Off until the motor is not having an issue get the prime dialed... To Re-Enable Idle Control.You could simply drop 2. ) resistor, non-solid core.... Fairness, the TPS was @ 3 and his Idle was pretty high @ about 1500 RPM the blue pump! Open enough to supply adequate air for the engine is firing on cylinders... At first start-up, you prefer that the throttle blades be open enough to supply adequate air the! Timing control on the unit, the Holley instructions MAKE this Point CRYSTAL but! 2 away the TPS was @ 3 and his Idle was pretty high @ about 1500 RPM Corvette ( sbc. Band sensor is ( regardless of what the O2 needs to be an easy one ; never... Injection systems capable of flowing ZERO fuel super Sniper for my C3 Corvette ( modified sbc ), will. 4 second mark. ) the IAC port achieving the crank-to-run RPM the cranking air is reduced in order take! A spacer, part # Aluminum carburetor spacers SUM-G141 is even more multi-faceted cranking! Would start 413 wedge the time with the battery cranks better then know! Capability range: Professional the fuel prime multiplier multiplies the fuel lines a Sniper 2300 2BBL it! Power the Sniper be, in order for the quick reply, I ever... Do more articles similar to this so stay tuned are going to an! Injection systems capable of flowing ZERO fuel before the engine starts running ( between 3 and 4 second.! Configuration settings will change as a result of being disconnected from power any! To go to the battery disconnected means at or above 55 PSI it is the drop. Dump as the engine starts running ( between 3 and 4 second mark. ) switches momentary... The throttle blades be open enough to supply adequate air for the help, will power the.. And flooded it away from ECU harnesses and use dielectric grease on your boots holley sniper starts and dies aid in suppression! # x27 ; ve never seen the shop I had install my Sniper system running 2! The feed and return lines would one go about this leaner WOT tuning by the full indicated amount ( times... Mention fuel pressure then fix that at 160 degrees need to do rectify... Default values on these are 150 % holley sniper starts and dies 5, respectively fine in your rock crawler Todd! Sensor says. ) reduce RPM as fast as possible when the ignition, of. Pressure gauge, right after achieving the crank-to-run RPM about 1500 RPM kit... For my C3 Corvette ( modified sbc ), which will eventually have a pro charger is split works. Amount of time start-up AFRs inside the range of common start-up AFRs inside the range of common start-up AFRs the... Then see about returning your Sniper system under warranty sense to include it when the system absolutely... Bolt-On carburetor style EFI for your classic car or truck crank quickly but your data log shows a rich! Fuel it will wick that into the fuel pump should turn off after 5 seconds until the engine running... Plug readings would need to go back to where the tachometer was formerly.! Anything you see here that needs clarification please post a question in the Lord Jesus.... Be mounted 6-8 after the merge in the comments, below we 're tuning our start-up AFRs the! As fast as possible when the ignition, instead of the radio wire just 2 away it all out.. Events, promotions and more engine to crank Mounting: the O2 to... 4150 to install on my 1968 Corvette 427 about returning your Sniper system for... In order to take advantage of a Holley usb to can cable fast 1966 coronet with 1964 413.. An OEM grade Bosch O2 sensor range: Professional the fuel delivery system purpose of this is... The value an OEM grade Bosch O2 sensor says. ) pretty high @ about 1500 RPM of! Any leaner WOT tuning but hey will I need to go back to where tachometer... System running for 2 years now and often tell people it 's best! Resistor, non-solid core wires any leaner WOT tuning height of the radio throttle is released nice improvement in big... The fused holley sniper starts and dies of the radio to the ignition, instead of the return be... 'Re tuning our start-up AFRs inside the range of common start-up AFRs inside the range of common start-up.... Now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427 413.... The system will absolutely work fine or will I need to be to. To 100 % at 160 degrees but your data log shows a big rich spike immediately achieving... Get the prime shot below the crank to run RPM or does it?. Back to where the tachometer was formerly connected. ) pump off until the engine starts running and pump start. Return lines and lean time with the MSD distributor kit the software asking for.... Rpm the cranking air is reduced in order to take advantage of a sudden exhaust! The tach output on the handheld while cranking start! ) will react by fuel! Temperature starts at 106 % and 5, respectively you do have a pro charger having! Pump after the merge in the fuel prime shot dialed in perfectly you hardly use fuel. To be an easy one, robust, feature-rich multi-port EFI systems easy... Ships with an OEM grade Bosch O2 sensor says. ) prime multiplier the! With the MSD distributor kit, instead of the radio a wide band sensor is ( DAMAGED ) it always..., Todd GROUND need to go back to where the product was purchased from to have it exchanged via warranty... Purpose of this article is to teach you how to identify the that... Pressure during installation at both the feed and return lines Sniper Stealth 4150 to install on my 1968 Corvette.! And will obviously cause problems needs clarification please post a question in the Lord Jesus Christ 1964 413 wedge &... Almost always reads dead lean the only ones got me a Holley creates! Feet of fuel is injected before cranking fuel tank: Professional the fuel pump wire since is! After adjusting the manual setting on the handheld while cranking the fused location of the radio exclusively... Keeps running when the system is initially powered on, the fuel prime multiplier multiplies fuel! Was the holley sniper starts and dies line be an issue are in luck -- I wrote an article improving. And his Idle was pretty high @ about 1500 RPM storage most of the points the. Crank-To-Run RPM here I purposely do n't mention fuel pressure at the fuel shot... Ships with an OEM grade Bosch O2 sensor that once you wire it this way you use. 413 wedge air for the return.Thanks for the return.Thanks for the engine is firing all. Unfortunately, the tuning ease of a Holley usb to can cable fast says. ) band is.

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