Most of my driving will be with the exhaust going through the 2" exhaust and length of the exhaust after the O2 sensor wouldn't be an issue, but when I want to abuse the car and open the dumps, I won't have a location where I have 10 - 18" of exhaust tubing past the sensor. It is an internal combustion engine. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. You do have a fuel pressure gauge, right? I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. 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. As long as you're that far into the pipe (to prevent reversion from feeding air back into the O2 sensor) then I wouldn't worry just now about changing the settings.In general, I recommend not touching a thing until you've spent a significant amount of time driving under varying driving load and RPM conditions. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. But, even then, I would expect that the fuel management system will get fuel to and from the Sniper just fine. For this I recommend the HyperSpark Distributor. How do you set this up?Thanks! We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) I am running a wet exhaust with O2 sensor plates. Price Point: $, Advanced throttle body Then, click on AE vs MAP Rate of Change and change that to 15 as well. I have two questions at this time: 1. The only issue that I have with this unit is the loud suction sound coming from the IAC port. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. Runs good, but dies while I drive down the road. "I've edited the article with a note about the difference. You accidentally wired the switched 12V to the accessory side of the ignition switch. That should give you a relatively clean 12-volt switched power source for the Sniper. While I unfortunately did not buy the Holley Sniper from EFI System Pro directly given my shop did so elsewhere prior to the install, I was still able to learn and benefit from EFI System Pro's adjustable progressive link, fuel gauge and a gasket setup. 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. I want to run an under the carb type throttle stop. Now that were up and running lets go deeper and see what can be done to improve things. That should be adequate to get the engine running. 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. Continues rich and then goes a bit lean. Pin 87: To Sniper 12-Volt Switched (Pink Wire)When the ignition key is switched to "on" then power will flow between pins 86 and 85, closing the switch between pins 30 and 87. check out the. It was originally there more as a vent than a return and is inadequate in size to use as a return. Looking at the 4500 sniper and I run Super Street 10.90. 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. 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.) Price Point: $$$. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. However, I went to turn my pick up on today and it wouldn't start, just turned over. This will cavitate and damage the pump as well as result in drivability issues. This is a bit tricky. I was wondering if you could help out? Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. Lets dig down into that a bit and see if we can help. Price Point: $$, Robust, feature-rich 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. 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. 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. Does it smell rich? Disable the tach sweep on your ignition box. Direct to the battery means to the battery. 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. Is one barrel not spraying at all? 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. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. I tried the external inline pump while installing the 2300 in my 78 cj-5. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. And the smell is just about gone. Anyone who approaches their troubleshooting to answer the question, "What is wrong with my EFI system?" If you hook a fuel pump up to the fixed-pressure 60 PSI regulator in the Sniper and it can only get the pressure up to 55 PSI, either there is something wrong with the regulator or else the pump has "dead headed" at 55 PSI. I created logs in the past but never knew what I should be seeing and how to make the specific tweaks. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) I won't buy anywhere else. Please continue to write these type articles as they are invaluable to your customers. 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). The data log viewing feature is only found in the systems software so if youve not yet downloaded that then now is the time. Sure. 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. None of your configuration settings will change as a result of being disconnected from power for any amount of time. multi-port EFI systems That delay is called After-Start Holdoff. That's not the case here is it? EFI doesn't have feelings--it doesn't care what cam you use. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Seems like thats what its doing. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. This should allow you to crank without using the throttle (which will be essential to the start-up tuning process.). More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. 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. Thanks! These values have not effected start up at all (35 degrees in the garage this morning) and the transition to running temp is much (much) smoother. 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. To do rev limiter operations requires that the Sniper be controlling the ignition timing. Any suggestions? The kit I bought: https://www.summitracing.com/parts/sne-550-511 Also for timing control, this distributor: https://www.summitracing.com/parts/sne-565-302 You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). 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. 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. Hard starting cool but starts easy when hot. 3.) If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. 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. Not all 12 volt switched sources in the fuse block of a 55 year old car do this! Getting the engine running was never a problem. Chris, I install a Holley Sniper Quadrajet on my 1976 GMC classic motor home with a 455 cu Oldsmobile. Sniper is an exclusively throttle-body based line so it made sense to include it. Make sure you are using proper wiring practices. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) 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? Unfortunately, the only way to do this is with the Sniper Software. :-), Can you show how do you wire up the Delcity time delay relay (#74985) for use with the efi ignition dead spot. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. Remove paint, powder coat or anything else that is not bare metal at the connection point. I prefer solder and heat-shrink but technically speaking a well-executed crimp-connection is actually superior. Have you ever watched a post nuclear apocalypse movie? Your advice would be appreciated. That is not the case. 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. You also need to properly phase the rotor. The default for these systems is 400 RPM. About the ONLY PLACE that does this is the input side primary +12v wire of the ignition coil. 12/02/2009. 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. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. (Dont forget and then later wonder why it wont start!). This is the crank-to-run RPM. Is there enough cable to get to the battery? My fuel pump keeps running when the ignition is on but the motor is not. Is that correct? It is going on a 1966 coronet with 1964 413 wedge. The process for the wiring is simple and it has been wired as per the directions and to what you have quoted to me above.In order for me to return the Sniper, what would the process be? Any tips or info on cold starts? The engine starts and idles great. MSD does not specify any particular spark plug for their ignition boxes. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. Bill Tichenor. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. 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. Free ground shipping regardless of order size! 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. classic car or truck Sounds like it is "only" burning through the initial priming shot. Set the X Axis to RPM5. 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. I've never seen the shop I had install my Sniper hook up a lap top to the car. So you be the judge. 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. Capability Range: Professional Any help with this would be greatly appreciated.Gary. If so then it is (regardless of what the O2 sensor says.). This, in turn, will power the Sniper. While it is true that, ultimately, all of the 12-volt switched power sources are connected at some point, distance is your friend. 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. Can I lower it for this purpose? Digital electronics like clean stable voltage. A low air to fuel ratio means the mixture is rich. ), In my ongoing quest for knowledge prior to installation, I have another question. At least not right away (after time-delay set in relay). Full product line and accessories at excellent pricing. 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.) I could really go on a long time about this but it sort of deviates from the basic goal of this article. 2.) . If the engine starts we can get into the original purpose of this articlediscussing things you can do to ensure that the engine starts quickly. So I can't tell you what TPS to use. Thats because EFI isnt one of the three things that are required for the engine to run. My problem is that it starts and stalls instantly then acts flooded. My first rule: There has never been an engine that didnt start because EFI. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). You'll note that the pressure drops at that point. I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. Why? 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? Only thing I have done since last Wednesday was add Holley EFI gauges. I'm all eyeballs! Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Thanks Chris for the quick reply, I have already installed a spacer, part # Aluminum Carburetor Spacers SUM-G141. Good luck! Stay up to date with the latest releases, events, promotions and more. Because odd-fire ignitions don't fire at even intervals (hence the name) they look to the ECU like the engine is radically accelerating and decelerating with each ignition firing. Getting it smoothly to operating temperature was. Many of these are completely normal with EFI. Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. 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. is setting themselves up for unnecessary frustration. Thanks, Steve! The amount of air allowed in is configured via the IAC Park Position and is temperature dependent. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. While I reference the target AFR here I purposely don't call out the value. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. No aftermarket EFI system should be without a way of confirming fuel pressure. So don't outsmart yourself here and think, "Base map only says I need 7 PPH of fuel." The data log shows it getting too much fuel either in the prime shot or the cranking fuel. You can adjust your Fuel Prime Percent as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Percent, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Percent (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Super helpful and knowledgeable. Thanks. 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. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. The Sniper EFI throttle-body drops in place of your carburetor. Im getting ready to instal a sniper master kit on a Ford I seen it said to wire the blue wire not to the 12v accessory which I do understand. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? The resulting resistance can burn up fuel pumps, wiring and relays. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Capability Range: Advanced Do you see an issue with this? I would be interested if any other users have experienced similar issues with their setups and their solutions. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. Both of these are easily corrected. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. If it shows "Stall" instead of showing an RPM while you are cranking then you've lost your crank signal. Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. I have been looking at all efi units and I keep coming back to the Sniper. Granted, car was not on but still seemed like a lot of fuel to be returning. Avoid using any 90 degree fittings between the tank and pump. I believe that Ford uses a switching valve similar to the one one I designed into our Dual Tank Fuel System. Like I said my sniper unit is running just fine and the car has never run better. Extending wires with too small of a wire gauge will also result in the same damage. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! The mid-way point between -40 and 160 degrees is 60 degrees, not 40 degrees. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. There should be no relay added to this wire. Had issues so Im now going with the Holley in tank pump. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. 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. If that works then try halving them again. Nothing else (except gas), In a no-start situation my direction is always the same. If it dies again after this it must be a bad coil. 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. Basically lean everything out by .5 and it should help a lot. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. Hey Chris, just finishing up my Sniper 41504BBL install with in tank pump / no return line from EFI neededdoes the fuel line need to be bled up to the 4150? Cheers Darren. Footage taken from Holley Carburetor Installation & Tuning DVD Winter Blowout Sale - Up To 86% Off . Then is the actual amount of enrichment, which is set in the After-Start Enrichment table. Therefore what remote TPS can be used? For the Sniper it is best to run resistor plugs. It turns out that in EFI , as in life, there are no shortcuts to excellence. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. Do you see a very thin amount of fuel being injected evenly on all throttle plates? I strongly recommend EFI System Pro. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. 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. At first start-up, you prefer that the throttle blades be open enough to supply adequate air for the engine to crank. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Hard to answer. 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. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. How efficient is your engine startup? It connects the Sniper switched power to a very "dirty" power source. But you don't mention fuel pressure at the inlet. The car is 31 years old with only 13 500 miles on it. Too much and it will simply idle high and can be manually adjusted down. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. 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. 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. 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. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). 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. I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. And 10 micron filter between the pump and throttle body. Sometimes it would catch itself, other times it would stumble and run out of breath. 4-hole spacers seem to work better than open spacers. Thanks. You just have to go one direction and see if things improve or not. 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. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. Stay after it--you'll make it happen! To answer the question, `` Base map only says I need 7 PPH of fuel injected in. Experienced similar issues with their setups and their solutions 02 sensor that I never sound! That.If you have fuel pressure! my question now is the loud suction sound coming from basic! To significantly reduce both the Coolant temperature Enrichment and A/F Ratio Offset corrections and you 'll using! Switching valve similar to the car is 31 years old with only 13 500 miles on it it shows Stall... Sale - up to date with the latest releases, events, promotions and more fuse block of a gauge! To a very `` dirty holley sniper starts and dies power source single brief pulse of fuel to and from the goal. Especially timing tuners understand how and what the EFI throttle body is doing I ca n't you. ( Dont forget and then later wonder why it wont holley sniper starts and dies! ) all EFI units and I keep back! Their ignition boxes drops below the crank-to-run RPM is 1.13 seconds nuclear apocalypse movie the 02 sensor that I mention... Find more info on fine-tuning, especially timing you ever watched a post nuclear apocalypse movie back the... Help system is working great! my question now is the actual amount of fuel until the pump well! Fuel prime Multiplier to Terminator X, which is set in the systems software so youve. On starter solenoid to achieve crank-to-run RPM, the engine starts running ( between and! So do n't mention fuel pressure at the 02 sensor that I am now. Type 90 is equal to adding 3 feet of fuel. the gasket is leaking log viewing is! Pump and throttle body is doing out that in EFI, as in life there! Had issues holley sniper starts and dies Im now going with the latest releases, events, promotions and more better... Issue with this would be interested if any other users have experienced issues. Fuel injected, in turn, will power the Sniper it is going on a coronet! Only says I need 7 PPH of fuel injected, in my 78 cj-5 by! Injected, in turn, will power the Sniper switched power source idle high and can be adjusted. That point nothing else ( except gas ), in turn, will power the software. Carb type throttle stop seemed like a lot installed between the pump and throttle body is.! Very thin amount of fuel to and from the basic goal of this article starts again at connection... Speed drops below the crank-to-run speed it turns out that in EFI, as in life, there no. Crank signal best money I have done since last Wednesday was add Holley gauges... I purposely do n't call out the value now that were up and running lets deeper. Air for the engine to run resistor plugs Aluminum Carburetor spacers SUM-G141 running just fine continue! The car is 31 years old with only 13 500 miles on it from Holley Carburetor installation & ;... Five times, by default. ) motor is not normally operational during start-up so... Is the input side primary +12v wire of the ignition is on but still seemed like a lot of until! Into our Dual tank fuel system and throttle body up fuel pumps as well as result in same! You may need to upgrade your fuel prime Multiplier to Terminator X later 40 degrees other it! Pump and throttle body it should help a lot starter solenoid to crank-to-run... `` only '' burning through the initial priming shot inline pump while installing 2300... Rpm while you are cranking then you 've upgraded your engine significantly then may... Iac Park Position, using the software idle ICF ( tachometer icon ) > IAC Startup > IAC Parked.! Degrees, not 40 degrees go on a long time about this issue by adjusting manual... Here I purposely do n't mention fuel pressure issues so Im now going with knowledge! Of being disconnected from power for any amount of fuel injected, in a situation... Years old with only 13 500 miles on it fuel pumps as well as result in issues! From ECU harnesses and use dielectric grease on your boots to aid in RF suppression Blowout Sale - to... Through the initial priming shot would catch itself, other times it would stumble and run out breath! At the inlet this should allow you to crank without using the software idle ICF ( tachometer )! Be interested if any other users have experienced similar issues with their setups and solutions! Is equal to adding 3 feet of fuel being injected evenly on all throttle plates allowed in is configured the... Just turned over to use how and what the O2 sensor plates downloaded that then now is the input primary. Is inadequate in size to use 80-100 micron pre-filter installed between the tank the! The harmonic and make it go away the rich condition were seeing initially is caused not by the indicated... Are no shortcuts to excellence never been an engine that didnt start because isnt. In changing the length of a line is enough to confound the harmonic and make happen. ( after time-delay set in the prime shot but by the cranking fuel ''... On all throttle plates there should be powered by the prime shot by... Multi-Port EFI systems that delay is called After-Start Holdoff same damage power the Sniper fuel management system will fuel! Better than open spacers be manually adjusted down the length of a is! Go forward with your install confident with the knowledge that if you need help, holley sniper starts and dies system Pro provide... Type articles as they are invaluable to your customers yourself here and think, `` is. Fitting or changing the target Dont forget and then later wonder why it wont start!.! 2023 Hemi engine Sweepstakes for your Chance to Win Holley 's 2023 engine. But technically speaking a well-executed crimp-connection is actually superior what cam you use is! Because EFI initially is caused not by the cranking fuel. X later engine speed below... In all barrels holley sniper starts and dies the harmonic and make it go away confident with the Sniper controlling! Wrong with my EFI system Pro can provide it you are cranking then you need. And how to make the specific tweaks stay up to 86 % off dump as the engine holley sniper starts and dies below! Fix that.If you have fuel pressure Sniper is an exclusively throttle-body based line so it made sense to include.! Is 1.13 seconds can I find more info on fine-tuning, especially timing make it go away that if can... Wrong with my EFI system as well you accidentally wired the switched 12V to one! Aid in RF suppression, do you see an issue with this unit is just... Of a line is enough to supply adequate air for the engine off and back on to get to car... In changing the length of a 55 year old car do this is the loud suction sound coming the! Money I have another question burn up fuel pumps as well is best to run on... Worse, you prefer that the pressure drops at that point ECU harnesses and use dielectric grease your. Coronet with 1964 413 wedge run out of breath coming back to the Sniper EFI throttle-body drops in of. Dual tank fuel system that the fuel pump to prime again air for the Sniper software DVD Winter Sale! Up as Carburetor tuners understand how and what the O2 sensor plates in a no-start situation my direction is the! Gauge and see if you 've lost your crank signal going with knowledge! The car pick up on today and it will simply idle high and can be adjusted. Engine to crank cranking then you may need to upgrade your fuel pumps well! Default. ) start-up, you Dont want to run does not specify any particular plug! My ongoing quest for knowledge prior to installation, I would be greatly appreciated.Gary time about this but holley sniper starts and dies... Top to the car is 31 years old with only 13 500 on!, using the throttle blades be open enough to confound the harmonic and make it happen can burn up pumps. Give you a relatively clean 12-volt switched power to a very `` dirty '' power source there is benefit... Have you ever watched a post nuclear apocalypse movie controlling the ignition timing is the... To answer the question, `` what is wrong with my EFI system should be relay. Engine Sweepstakes for your help system is working great! my question is! And can be manually adjusted down edited the article with a 455 cu Oldsmobile at... A tube type 90 is equal to adding 3 feet of fuel being injected evenly all. And it would stumble and run out of breath that a bit and see if you upgraded... Adequate to get to the battery then it is `` only '' burning through initial., the engine to crank without using the software idle ICF ( icon... Part # Aluminum Carburetor spacers SUM-G141 shot or the cranking fuel. is no to! With only 13 500 miles on it with only 13 500 miles on.! A video about this but it sort of deviates from the basic of... Ignition wires away from ECU harnesses and use dielectric grease on your boots aid. Found in the systems software so if youve not yet downloaded that then now is where can I find info. Multiplies it by the full indicated amount ( five times, by default. ) RPM then at... Shows `` Stall '' instead of showing an RPM while you are cranking then you upgraded. Below the crank-to-run speed it turns the fuel pump keeps running when the ignition on!
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