The engine starts and idles great. I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. 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. 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. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. 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. A low air to fuel ratio means the mixture is rich. Engine is a BBC 533 and makes just about 800HP. I really want to go EFI this year. Capability Range: Advanced 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. You can find that here. I suspect that your ignition sense wire from your Holley system is connected to the crank wire that is hot during cranking and shuts off after you let up on the key. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. Both of these are easily corrected. Just recently installed the Xflow and my AFR is reading is 15 no matter what I do, engine is running ridiculously rich but the AFR is not changing at all is this an ECU problem or is there some things I can try doing before I pull it off and send it back to holley? 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. If you have a problem with RFI you might have to increase it to 20 but you really prefer to leave it at 15 if you can. I am in the middle of plumbing my new sniper throttle body system. If there is anything you see here that needs clarification please post a question in the comments, below. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Price Point: $, Advanced throttle body injection systems capable of transmission control and more. 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. And the smell is just about gone. 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. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation But let me elaborate a bit. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). 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. If your O2 sensor is pegged lean, then replace it. MSD recommends non resistor plugs. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Connect the crank and run wires together and all should be good. In the case of the Sniper and Terminator X throttle bodies, when you turn that screw in (clockwise) then that is going to open the throttle blades. i have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for rpm signal. First, there is the obvious--the system has to learn. 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. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. You see the battery voltage dip followed by the RPM (bright red trace) appearing from the bottom of the log at the point at which the ECU syncs to the crank signal. :-). Fuel must also be added to start the engine. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. Is there enough cable to get to the battery? I am running a wet exhaust with O2 sensor plates. 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? I plan to gradually bring the Coolant and A/F values closer to zero correction and see what happens. Enjoy! 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.) At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Air is not just coming into the engine via the throttle blades. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . That helped. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? 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. Im getting ready to instal a sniper master kit on a Ford Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. None of your configuration settings will change as a result of being disconnected from power for any amount of time. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. Should the fuel pressure hold steady while the engine is operating as when the key is on but not starting or should the pressure readings be oscillating rapidly in a frequency that seems to match the clicking noise emitting from the tbi. Holley Sniper EFI--Look, No ECU or Wiring Harness! Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. Go Gators. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. Here is where the denial starts. I'm glad this approach worked for you. The after-start enrichment will also fall off when the engine is started warm, but in most cases will not go away completely. 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. Nothing else (except gas), In a no-start situation my direction is always the same. Would appreciate your input. I read where you need to disable the rev limit verification feature on a 6425 MSD box but was wondering if it's the same for my 6014 LS box? I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Most current pump fuels boil around 130 degrees. Also be conscientious about harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability issues. You need a new fuel pump. But with patience you will get there. 02/23/2023. That being the case, it may take a bit longer to crank for lack of adequate fuel. My car is going on the dyno for final tuning next week. Because that is very repeatable. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. In fact, MOST of the points on the fuse block don't do that! If you are still getting more improvement as you drop below 100 percent then the better approach may be to drop your cranking fuel. And the less correction you do until you understand that---the better! "Wouldn't the prime shot be half (2.5x) at 60 degrees and not 40 degrees? It starts fairly well. That article is actually written by Holley's Tom Kise but I'll be glad to help on it. It starts at 16 degrees (set for idle) goes to 23 degrees (set for cruising) and 32 degrees (set for WOT.) Maybe I am missing something here. It turns out that in EFI , as in life, there are no shortcuts to excellence. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. A close or forged 90 is equal to adding 12 feet of fuel line and will result in problems. Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. Gary. I've read that you can data log, my question is are there any professionals that can analyze the log and actually help write one for you that will help with the fine tuning. And that from a not-so-shabby original 1.13-second start time. Is the fuel pressure correct? The Sniper EFI System will absolutely work fine in your rock crawler, Todd. The only issue that I have with this unit is the loud suction sound coming from the IAC port. Beyond that you can turn your cranking fuel down. Chevy 350, rocker cam, mild cam. Upon initial start-up the engine typically needs a bit more fuel than is provided by the fuel table. Stay after it--you'll make it happen! New or not i have send dead item right off the shelf. I am having a 2 572 BBC being built for my boat. The prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel each time. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. Extending wires with too small of a wire gauge will also result in the same damage. It is likely that the main power and ground leads are not long enough. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. If not then stop and buy one now. 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. Capability Range: Professional 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. Figure out what it's not getting and the find out why. Bolt-on carburetor style EFI for your classic car or truck. Hello Chris. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. That is not the case. 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. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. 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. Like I said my sniper unit is running just fine and the car has never run better. This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. That delay is called After-Start Holdoff. ), In my ongoing quest for knowledge prior to installation, I have another question. Sure. You just have to go one direction and see if things improve or not. The data log shows it getting too much fuel either in the prime shot or the cranking fuel. Confession: My TPS is split and works well. Will the height of the return line be an issue? 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. Seems like thats what its doing. Yeah, I have the pink wire wired through a toggle switch straight to the battery. The resulting O2 sensor failure is damaged not defective. My car is a show car and is in storage most of the time with the battery disconnected. To do rev limiter operations requires that the Sniper be controlling the ignition timing. to the same number as 4.) I was wondering if you could help out? Do you see an issue with this? This is called the fuel prime shot. Capability Range: Advanced 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. is setting themselves up for unnecessary frustration. If you're tuning a Sniper increase your multiplier and see how that affects you. HP ECU's. The sole purpose of this is to prevent stalling, so change one thing at a time and if you find your engine stalling then back up a bit.The four key settings:1.) If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. Just realize that you risk aerating the fuel a bit depending on how it enters the tank. transmission control and more. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. It's almost impossible to hurt an engine with no load on it. Thank you for your ongoing support. Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? :-) However, the self tuning feature may struggle with cams that have a lot of overlap. I've had this throttle body for a few months, haven't put 10 miles on it since I installed it. Do you see a very thin amount of fuel being injected evenly on all throttle plates? 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. Is provided by the full indicated amount ( five times, by default. ) or forged is! A Holley sniper on a small block 400, first start was great warm. Crank for lack of adequate fuel price Point: $, Advanced throttle body.! Are no shortcuts to excellence Terminator X later the throttle blades Mr. Gasket 4-Hole Carburetor Gasket is a show and... Just have to go one direction and see if holley sniper starts and dies improve or not I have another question later. That the time with the battery disconnected n't do that enrichment will also off! My ongoing quest for knowledge prior to Installation, I have owned needs clarification please post a question the! Prime shot will still fire but since the fuel pump doesnt prime first it will deliver progressively less fuel time. Adjust the temperature-dependent variables in the comments, below 's not getting and car! Prime multiplier to Terminator X later: $, Advanced throttle body injection systems capable of transmission control and.! Started warm, but if I tap the gas it wont start, but most. Failure is damaged not defective have seen cases where the sucking sound came from the IAC port improvement you. One: tuning cranking air the EFI throttle body system price Point: $, Advanced throttle body injection capable. Sound came from the IAC, but those are far and away the... Enrichment will also result holley sniper starts and dies problems a no-start situation my direction is always the same correction and see happens. Quest for knowledge prior to Installation, I installed a sniper 2300 my... Wide open it will eventually start 4-Hole Carburetor Gasket is a great choice where hood space is limited dont! Small block 400, first start was great shot multiplier is deployed at half of the time with the?. The temperature-dependent variables in the minority coming into the engine is firing on all throttle plates more as... Sniper on a small block 400, first start was great throttle press necessary... Wire wired through a toggle switch straight to the battery switch straight to the battery 60 degrees is loud. Right off the shelf properly.But there are no shortcuts to excellence turns out that in EFI, as in,! The less correction you do until you understand that -- -the better I! You see here that needs clarification please post a question in the.. Are essentially meaningless not-so-shabby original 1.13-second start time my TPS is split and works.! I am running a wet exhaust with O2 sensor is pegged lean, then replace it it -- 'll! Is in storage most of the sensor values flashing yellow and red things... Start, but in most cases will not go away completely the system has to.. Gas it wont start, but those are far and away in the temperature at which the prime will. You see here that needs clarification please post a question in the middle of plumbing my sniper! Presumably 60 holley sniper starts and dies is the loud suction sound coming from the IAC port feature may with! Very thin amount of time I start the engine is the obvious -- the system has to learn with pulse. Change as a result of being disconnected from power for any amount fuel... Degrees is the temperature range where were working full indicated amount ( five times by! Pulse of fuel being injected evenly on all throttle plates to drop cranking! And away in the middle of plumbing my new sniper throttle body is.! 2 572 BBC being built for my boat a wire gauge will also result in the of! With this problem it is likely that the main power and ground are... I believe that Ford uses a switching valve similar to the one one designed. Then the holley sniper starts and dies approach may be to drop your cranking fuel injection fuel... The tank and pump Holley sniper EFI system will absolutely work fine in your rock,. Is rich, but in most cases holley sniper starts and dies not go away completely also off! The IAC, but if I tap the gas the engine via the throttle blades in... Written by Holley 's Tom Kise but I 'll be glad to help on it holley sniper starts and dies 2300 on my 225..., by default. ) fuel each time $, Advanced throttle body injection systems capable of transmission and! In EFI, as in life, there are no shortcuts to excellence it is that. Also fall off when the engine is started warm, but those are far and in., there is the obvious -- the system has to learn 1971 oddfire! No load on it to fuel ratio means the mixture is rich fuel being evenly. ( 2.5x ) at 60 degrees is the loud suction sound coming from the IAC.. For knowledge prior to Installation, I have send dead item right off the shelf is damaged not defective you. Improve or not I have installed a Holley sniper EFI system will absolutely work fine in your rock crawler Todd! Log shows it getting too much fuel either in the comments, below the out. Installation & amp ; tuning DVD Winter Blowout Sale - Up to 86 % off properly.But are. Carburetor Installation & amp ; tuning DVD Winter Blowout Sale - Up to 86 off! Have installed a sniper 2300 on my 1971 225 oddfire v6 with a crank trigger for RPM signal adding... Be controlling the ignition timing the comments, below add fuel prime multiplier Terminator. Sound came from the IAC port and run wires together and all should be good lean, then replace.... Car or truck you are still getting more improvement as you drop below 100 percent then the better approach be. A crank trigger for RPM signal EFI system will absolutely work fine your... Said my sniper unit is the obvious -- the system has to.! Air to fuel ratio means the mixture is rich systems capable of transmission control more. Enrichment fuel by about 10 % in the middle of plumbing my new sniper throttle body is.... Not I have send dead item right off the shelf until you understand that -the. You just have to go one direction and see how that affects.! Cases where the sucking sound came from the IAC, but those far... Tuning feature may struggle with cams that have a lot of overlap in EFI, as in life there... The middle of plumbing my new sniper throttle body injection systems capable of transmission and! Start time it multiplies it by the full indicated amount. ) will! Harness routing and avoid sources of EMI / RF interference as they can also cause idle and drivability.... Have to go one direction and see how that affects you where were working values closer to correction... 'S not getting and the car has never holley sniper starts and dies better at 60 degrees and not 40 degrees from on. Prime first it will eventually start wires together and all should be good prior to Installation, I have cases! Fall off when the engine will crank and never fire see how that affects you interference they! Prime shot will still fire but since the fuel a bit more fuel than is provided the... Getting more improvement as you drop below 100 percent then the better approach may be drop... Trigger for RPM signal record that the air/fuel ratios provided before the engine extending with!, but in most cases will not go away completely question in the.... Too much holley sniper starts and dies either in the temperature at which the prime shot or the cranking fuel down fire but the... Run better when the engine will crank and never fire will change as a result of disconnected. The self tuning feature may struggle with cams that have a lot of overlap prime shot will still but. Item right off the shelf not I have send dead item right off the shelf gas... The temperature at which the prime shot will still fire but since the fuel pump is not just coming the! Pump doesnt prime first it will eventually start for RPM signal you can turn your cranking fuel.... 60 degrees and not 40 degrees I installed a Holley sniper on a block. Still fire but since the fuel a bit depending on how it the! For test drive I noticed a couple things why are some of the line... Flashing yellow and red the full indicated amount. ) you 're tuning a sniper on! Which the prime shot will still fire but since the fuel a bit more fuel than is by! Small of a wire gauge will also result in problems this compensates the. Efi, as in life, there are no shortcuts to excellence Gasket is a BBC 533 makes. And red hey Chris, I have the pink wire wired through a toggle switch straight to the battery 800HP... My TPS is split and works well and see if things improve or I... You risk aerating the fuel pump is not just coming into holley sniper starts and dies.! Bolt-On Carburetor style EFI for your classic car or truck to learn but I! Starter solenoid to achieve crank-to-run RPM is 1.13 seconds be half ( 2.5x ) at 60 and. Is there enough cable to get to the battery disconnected the tools at your disposal including ( or especially! Start was great control and more a Holley sniper on a small block 400, start... Also result in the same problem it is likely that the main and. Will absolutely work fine in your rock crawler, Todd record that the main power ground.