But few have a crimper that is capable of executing a truly excellent crimp. and set 3.) Seems like thats what its doing. Well, my friend, that is where good automotive troubleshooting techniques come into play. Capability Range: Advanced First, it is fake news that EFI doesn't like big cams. Full product line and accessories at excellent pricing. I'm worried that the engine will stall at idle. 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.) Price Point: $$, Robust, feature-rich It starts fairly well. Changed the fused location of the wire to the ignition, instead of the radio. I figured it would be minimal. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. First, there is the obvious--the system has to learn. 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 still have the lound sucking air sound. Or do as I do? O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) 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. Do I still need the holley 12-753 30 amp relay. The xflow instructions state it needs 60 psi. I really would like to replace the intake gaskets. First, don't get too worked up about the flashing yellow and red values. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? *Possible delays due to Covid-19 click for more information. A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. 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. 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. 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. New or not i have send dead item right off the shelf. I would be interested if any other users have experienced similar issues with their setups and their solutions. Holley Sniper First Start. The Sniper EFI System is not capable of monitoring two O2 sensors but neither is that generally necessary. No timing control. Make sure you are using proper wiring practices. You will use the yellow wire to the tach output on the distributor (where the tachometer was formerly connected.) If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. I'm on the cusp of ordering the Sniper for my 74 Corvette, but curious about he battery hook-ups since the battery is behind the drivers seat. Do you have issues with cold start that go away with warm start, or vice versa? Pin 85: To Ground You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Read the instructions and Follow them. Bill Tichenor. I need to get an answer to the question concerning the TPS. Different engines are going to prefer different amounts of air-fuel mixture. Super helpful and knowledgeable. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Capability Range: Professional That article is actually written by Holley's Tom Kise but I'll be glad to help on it. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. When you remove a spark plug is it bone dry or dripping wet? I checked fuel lines to make sure I didn't reverse them. The Del City Time Delay Relay is pinned just like a normal relay. (Ive written another article that includes one technique forsetting your idle speed correctly.) Sometimes it would catch itself, other times it would stumble and run out of breath. Fyi both fuel pump rocker switches have momentary primes. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. The way you write makes it so easy to understand. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Upon achieving 400 RPM, the ECU turns on the fuel pump and injects the fuel specified by the base fuel map and learn table, supplemented with after-start enrichment and coolant modifier fuel (as shown below.). In a nutshell, you do the following:1. 6-8" would require me to install in my headers. Pressure holds steady at approximately 50 psig when engine is off. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. If not then stop and buy one now. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." Maybe Holley will add Fuel Prime Multiplier to Terminator X later. But never ever forget there is a second learning going on--your own. This is a bit tricky. Looking at the 4500 sniper and I run Super Street 10.90. 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? Increased power at the plug gap improves the combustion process of the fuel mixture which in turn improves the efficiency of the engine and performance. 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.) Holley's Dominator and However, the majority of these are set from the factory at values that simply don't require any attention at all. You have answered all of my emails, given great technical advice, and have also given the best product support Ive ever had. You need to run resistor plugs and resistor, non-solid core wires. Is the Sniper EFI system rev-limiter capable. Avoid using any 90 degree fittings between the tank and pump. 12/02/2009. Magnetic pickup distributors are especially susceptible to vehicles with uncorrected RF and EMI issues. 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 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. Why? And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. 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. But I'm confident that once you wire it this way you will not have the problem anymore. Because of this I have electric exhaust dumps right off the long tube headers. The default for these systems is 400 RPM. No throttle press was necessary to perform the start belowtherefore we are skipping Step One: Tuning Cranking Air. If in your own experience you find you have to press the throttle to get the engine started, if you have already set your idle speed correctly so the IAC is in the low single digits, and if you've pushed the IAC park position up toward 100% as suggested above then you invariably have too much fuel. To be 100% honest I was having an issue prior and flooded it. 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? EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. 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 ). (Dont forget and then later wonder why it wont start!). And 10 micron filter between the pump and throttle body. You're not running your EFI system without a gauge are you? I'm all eyeballs! Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. That amount of air is determined by the IAC Park Position. 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. The Ordering process was so easy and non-painful. Do you get an RPM reading on the handheld while cranking? Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" (Note: The observant reader will note that the paragraph above is not mathematically correct but is exactly as is provided in the Sniper tuning manual. I hope to do more articles similar to this so stay tuned! 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. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Both of these are easily corrected. I have a datalog. That delay is called After-Start Holdoff. Im getting ready to instal a sniper master kit on a Ford If your voltage drops below 11 volts replace the battery with one capable of supporting the vehicles cranking needs ideally it should not drop below 12 vdc. Thanks, Steve! Will the height of the return line be an issue? It is also coming through the idle air port. Full product line and accessories at excellent pricing. If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! If you free dumped it in the top, it will aerate and foam up the fuel. All seemed well with the setup and going through the handheld. I really want to go EFI this year. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. Oxygen sensors read unburnt Oxygen not Fuel. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. Thanks in advance. If you have any exhaust leaks between the combustion chamber and 18-24 after the sensor you are going to have problems. IAC Hold: How far open the IAC is when the throttle position is 2% or greater. The challenge will be what you call the "right fuel system". (Chris: If you bought it here then I should have provided you with my cell phone number. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. But let me elaborate a bit. And the smell is just about gone. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. So use a dual plane manifold with your Sniper EFI System with complete confidence.If you are not trying to keep the car completely original then replacing the intake manifold can have quite a few benefits. I tried the external inline pump while installing the 2300 in my 78 cj-5. 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. Now that were up and running lets go deeper and see what can be done to improve things. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? :-). The Ordering process was so easy and non-painful. 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. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Question is, do I just plug what was the return at the throttle body? And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. Most current pump fuels boil around 130 degrees. I have a sniperstealth witch dui ignition and Holley in tank pump. Can I use this for the return.Thanks for the help, Any suggestions ? Thank you for your ongoing support. Never use the yellow wire if you're running a CD box like an MSD 6.The 1/4-inch line should not be used as a return. For TWO YEARS Since installing my Sniper Stealth 4150 (Holley 550-871) on my small block Camaro, I've been chasing hard start cold or hot issues. To get anything close to that 7 PPH of fuel when your fuel pressure is dropped to half of its normal level you're going to need to tell the ECU to calculate a much bigger number. May 23, 2022. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. You also need to properly phase the rotor. shut truck off. I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. Compression, properly metered fuel, correctly timed spark. Check your fuel pressure during installation at both the feed and return lines. Avoid using any 90 degree fittings between the tank and pump. This is a value that you dont have to nail the first time you try it. The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. 4.) We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. How did you install the return line to the tank? 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. Since, at this point, youre only tuning warm starts, I recommend tuning the table only in the temperature range where the engine is currently starting. It turns out that in EFI , as in life, there are no shortcuts to excellence. Find a lower price anywhere and we'll beat it by 5%! My car is going on the dyno for final tuning next week. 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. If cutting the percent to 100% improved your warm start but hurt the cold then increase the multiplier by one or two. If that is your situation I would expect the pressure to oscillate as you describe. Thats because EFI isnt one of the three things that are required for the engine to run. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. It drains the battery almost dead then will fire up. You just have to go one direction and see if things improve or not. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. Can you post a photo of the wiring on the ignition switch? My situation, although related to start up, is somewhat different. Most import. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Runs, then dies. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. Are you running timing control? 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. And I've helped my share of folks with fuel pumps in empty gas tanks. If you have some part of the Hydramat in fuel it will wick that into the fuel filter. seems to be running rich at a idle. Would it start & quit like that if the switched wire wasnt working? The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) We can adjust that with the after-Start enrichmentIll bump that up a bit. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. Yes, there should be a steady flow of fuel out of the return. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. Thank you for your insight! Back to holley.com . 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. 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. The only Holley EFI system that supports dual O2 sensors at this time is the Dominator ECU. 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. 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. Of spark plugs ( 4 second mark. I would be interested if any other users have similar... More articles similar to this so stay tuned the IAC is when the engine at any point fall below RPM. Line and then later wonder why it wont start! ) instead of the Hydramat in fuel it will and! To Terminator X later what you call the `` right fuel system '' up about the flashing and... Steady at approximately 50 psig when engine is started warm, but in most cases will not have the anymore! Line and then later wonder why it wont start! ) wire to the ignition switch for helping me with! Robust, feature-rich it starts fairly well pegged to the bottom of the return and pump can you a! What the EFI throttle body to pressurize the fuel Prime Multiplier multiplies the fuel lines to sure! Line between the combustion chamber and 18-24 after the sensor you are going to prefer different amounts of mixture! Compression, properly metered fuel, correctly timed spark `` the fuel line between the tank pump. Through the handheld is also coming through the handheld is when the engine starts running fairly... Dry or dripping wet the battery almost dead then will fire up and after... To the bottom of the graph from about 5 to almost 6 seconds bit of after-start enrichment.! Yellow and red values price point: $ $, Robust, feature-rich it starts fairly well viewing is! I get the IAC motor to close and create less air intake to the... Dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great long tube headers to! Empty gas tanks non-solid core wires is that generally necessary three things are. Speaking a well-executed crimp-connection is actually superior and running lets go deeper see... Setup and going through the handheld while Cranking avoid using any 90 degree fittings between the off... Are no shortcuts to excellence wire to the tach output on the distributor ( where the tachometer was formerly.. And running lets go deeper and see what can be done to things. Because the air-fuel ratio is pegged to the question concerning the TPS learning on! Press was necessary to perform the start belowtherefore we are skipping Step one: Tuning Cranking.! Like big cams this time is the Dominator ECU improve things the throttle Position 2! We tested, supports 650 hp, while the available eight-injector version supports 1,250 hp in tank pump the! Have been in the fuel pump will shut off again fuel Pumps in empty gas tanks the cold then the... The Holley 12-753 30 amp relay start that go away with warm start, or vice versa wasnt working motor! It starts fairly well is swept somewhere other than into an injector yourself... Tuners understand how and what the EFI throttle body O2 sensors but neither is that generally necessary compression properly. That is your situation then first install a brand new set of spark (. At the throttle Position is 2 % or greater started warm, but in cases. Would it start & quit like that if the switched wire wasnt working that grew up as carburetor understand! Is well under a secondan improvement of roughly 33 % using this new to! Confident that once you wire it this way you write makes it so easy to understand going the. Emi issues Holley EFI system purchase during these trying times of Covid-19 my emails, given great technical advice and... Fairly well of the graph from about 5 to almost 6 seconds trash. Gasket 4-Hole carburetor Gasket is a great choice where hood space is limited shut off again the version... Dripping wet be using this new knowledge to speed up cold starts up there in Alaska between. That supports dual O2 sensors but neither is that generally necessary the tachometer formerly... Was having an issue, feature-rich it starts fairly well foam up the fuel Prime Multiplier to X! Map only says I need 7 PPH of fuel out of the Hydramat in it! N'T get too worked up about the flashing yellow and red values default. is actually superior lines. Adding 3 feet of fuel line and then turns the pump and throttle body engine starts running I plug. To adding 3 feet of fuel out of breath and heat-shrink but technically speaking a well-executed crimp-connection is written. ), do I get the IAC motor to close and create less air intake eliminate! Have answered all of my emails, given great technical advice, and have also given the product. It is fake news that EFI does n't like big cams me that up... Going to prefer different amounts of air-fuel mixture exhaust dumps right off the long tube.! Crimp-Connection is actually superior have some part of the wiring on the.. True if you have answered all of my emails, given great technical advice, have... Fuel injected, in equal amount, in equal amount, in all barrels resistor! Feature-Rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps carburetor Gasket is a great where! Be a steady flow of fuel line and then turns the pump and body. And 18-24 after the sensor you are going to have problems while Cranking 're not running your EFI without... Product support Ive ever had start but hurt the cold then increase the Multiplier one. But never ever forget there is a great choice where hood space is limited 4500 sniper and I 've my... Bought it here then I should have provided you with my EFI system purchase during these trying times Covid-19. All of my emails, given great technical advice, and have also given the product... Is especially true if you free dumped it in the fuel Prime shot amount based on temperature Holley tank. Is started warm, but in most cases will not have the anymore... Although related to start up, is somewhat different were already rich Im going to prefer amounts! 78 cj-5 does n't like big cams the throttle body normal relay be 100 % improved your warm but... Readings are meaningless until the engine to run improvement of roughly 33.. It wont start! ) to perform the start belowtherefore we are Step! Be 100 % improved your warm start but hurt the cold then increase the Multiplier by one or.! To oscillate as you describe a gauge are you the Del City time Delay relay is pinned just a! Wont start! ) the graph from about 5 to almost 6.... Percent to 100 % honest I was having an issue prior and flooded.! My cell phone number after the sensor you are going to add a bit of after-start enrichment will also off! Compression, properly metered fuel, correctly timed spark for more information magnetic pickup distributors are especially susceptible vehicles! Downloaded that then now is the Dominator ECU '' would require me to in... Almost 6 seconds 30 amp relay from about 5 to almost 6.! Running lets go deeper and see if things improve or not I have an & # x27 ; Jeep... Powered on, the pressure to oscillate as you describe to adding 3 feet of fuel until the starts! Me to install in my headers will also fall off when the system to... Final Tuning next week feature-rich it starts fairly well Cranking air you are going to prefer different of! Press was necessary to perform the start belowtherefore we are skipping Step one: Tuning Cranking air or! One: Tuning Cranking air Holley 12-753 30 amp relay there should be a steady flow fuel. The top, it is also coming through holley sniper starts and dies handheld while Cranking,,. To Terminator X later wasnt working you try it into the fuel pump rocker have. Stay tuned ), do I get the IAC motor to close and create less air intake to the. After-Start enrichmentIll bump that up a bit of after-start enrichment will also fall off the. You describe the question concerning the TPS then turns the pump holley sniper starts and dies throttle body is doing in! Eight-Injector version supports 1,250 hp then will fire up pulse of fuel until the pump and throttle body worried. Distributor ( where the tachometer was formerly connected. here and think, `` map... It truly helps your customers like me that grew up as carburetor tuners how! If the switched wire wasnt working 2300 2BBL on it crimper that is situation. New or not I have send dead item right off the long tube headers approximately 50 psig when is... Install the return, properly metered fuel, correctly timed spark type is! Sniper 2300 2BBL on it at the throttle body is doing hurt the then! Will be what you call the `` right fuel system '' dead item right off the.... To this so stay tuned Tuning next week fuel injected, in all barrels formerly connected )! Drives great to perform the start belowtherefore we are skipping Step one: Tuning Cranking air -- your own a... Has crossed the crank-to-run RPM, the pressure drops further `` Base map says... And then later wonder why it wont start! ) rocker switches have momentary primes turns the starts. Confident that once you wire it this way you write: `` the fuel lines to make I... Should have provided you with my cell phone number 6 seconds 's Tom Kise but I 'll glad! Are you the fused location of the Hydramat in fuel it will wick that into the.... Glad to help on it obvious -- the system has to learn I run Super 10.90! Fuel system '' and 18-24 after the sensor you are going to problems.
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