Therefor, -40 + 100 degrees = 60 degrees. Thanks for the kind words, Tony. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. To be 100% honest I was having an issue prior and flooded it. Make sure the fuel pump is properly mounted and picking up fuel. Chevy 350, rocker cam, mild cam. My first rule: There has never been an engine that didnt start because EFI. Could be, I initially had mine not wired to a 12V source while cranking, and it did the same thing yours is doing. Capability Range: Advanced Capability Range: Professional i.e., 5x at -40 and 0 at 160. The xflow instructions state it needs 60 psi. I have it disconnected to flush any debris out.Thank you. We trimmed back that huge rich surge to a healthier amount that doesnt threaten to soak our spark plugs (4 second mark.) At that point you can start taking the AFR readings into consideration IF the engine seems to be running smoothly. to the same number as 4.) You should then have at least 18-24 of pipe after the sensor. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. I have an '89 Jeep 4.2L with a Sniper 2300 2BBL on it. And 10 micron filter between the pump and throttle body. Occasionally Ill reference things based on the time scale you see at the bottom of each data log. Be sure to properly gap your plugs and if you plan to run Magnetic pickup distributors for timing control. This is a value that you dont have to nail the first time you try it. It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. If it cranks better then you know you're getting too much fuel. Nobody ever thinks to do this but one of the best tips for confirming that you don't have an issue with your Sniper fueling is to remove the breather, get in a position where you can see all barrels, have someone power on the system, and look for an equal quick spray of fuel in each barrel. Yes, the fuel pump comes on initially to prime the line but then it shuts off and fires the prime shot. Or do as I do? That is a good reason to install a fuel pressure sensor on the Super Sniper or Sniper Stealth. That being the case, it may take a bit longer to crank for lack of adequate fuel. Enable a 1D table3. Great job implementing what I've written! This circuit shuts off during crank and will obviously cause problems. It is an internal combustion engine. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. Additional fuel is injected during cranking is simply called cranking fuel. 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? I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. 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. Have you ever watched a post nuclear apocalypse movie? idles good, runs amazing. He gave no details, is this an option and how would one go about this. 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. 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. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Im getting ready to instal a sniper master kit on a Ford Yes, there should be a steady flow of fuel out of the return. 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. I think it's a bad WBO2 sensor or bad IAC. Oxygen sensors read unburnt Oxygen not Fuel. I have a datalog. Did you hear the fuel pump run at key-on? If it dies or drops more than 50-75 RPM the throttle is closed too far. 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. Price Point: $$$. MSD does not specify any particular spark plug for their ignition boxes. One thing I miss is the instant drop in rpms that my 650DP had. Don't hesitate to call, nights and weekends included.). Getting the engine running was never a problem. So now youre left with tuning the Fuel Prime Multiplier. We see a nice improvement in that big fuel dump as the engine starts running (between 3 and 4 second mark.) Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. Unfortunately, the only way to do this is with the Sniper Software. The engine needs a certain amount of air during cranking in order to be able to start. 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. 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. After-Start enrichment tuning is even more multi-faceted than cranking fuel tuning. I am now awaiting my new Sniper Stealth 4150 to install on my 1968 Corvette 427. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. You need a new fuel pump. Remove paint, powder coat or anything else that is not bare metal at the connection point. Quick Start Tuning. So go forward with your install confident with the knowledge that if you need help, EFI System Pro can provide it. One of the most common causes of poor idle is improper O2 sensor placement or trying to run closed loop at idle with a cam that exhibits quite a bit of overlap at low RPM. But you can extend the leads using wires of an equal or heavier gauge. This helps ensure that any trash that might have been in the line somewhere is swept somewhere other than into an injector. Default values on these are 150% and 5, respectively. 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 Bolt-On EFI for your If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. Enjoy! Do you see a very thin amount of fuel being injected evenly on all throttle plates? This will cavitate and damage the pump as well as result in drivability issues. 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. This is normally completely adequate. 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. So you be the judge. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. 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. This Mr. Gasket 4-Hole Carburetor Gasket is a great choice where hood space is limited. O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) Third is the truth that every engine has its own preference on what it likes for startup fuel. Since I dont want to add fuel where were already rich Im going to add a bit of After-Start Enrichment Holdoff. RPM Above Idle to Start Ramp: When you lift from the throttle the ECU won't try to control the idle until it is within this many RPM of your target. You're not running your EFI system without a gauge are you? 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? (Dont forget and then later wonder why it wont start!). Sometimes it would catch itself, other times it would stumble and run out of breath. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Is there enough cable to get to the battery? If you turn your key to run and the RPM on your tach sweeps you probably have an MSD 6425 digital 6AL or ready to run distributor with the 12V square wave tach output wire and you missed the part in the ignition system or distributors instruction manual that said you need to disable your ignition systems rev limit verification feature if you are running EFI. Thank you for your insight! MSD recommends non resistor plugs. Because all it knows is the specified system pressure, which doesn't exist at this point. Joe. 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. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Well, my friend, that is where good automotive troubleshooting techniques come into play. 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. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! Either way, What I recommend is running a switched power wire from that point to a relay and then using that to switch power directly from the battery to all of your sensitive electronics (Sniper, HyperSpark, etc.). *Possible delays due to Covid-19 click for more information. 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. Part throttle sucking sounds. But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. That's a spread of 200 degrees so half of that would be 100 degrees. 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. features . Will the height of the return line be an issue? 03-14-2018, 07:03 PM. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. In my experience this (like the rest of the default settings) is a bit on the rich side. Continues rich and then goes a bit lean. Run the switched 12-volt back as close to the ignition as possible. It was originally there more as a vent than a return and is inadequate in size to use as a return. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. 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. Price Point: $$$. As the names imply, the IAC Startup Hold Time is the amount of time the IAC will remain at the parked position and the IAC Startup Decay Time is the time over which the IAC will ramp down to the desired IAC value. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. And it may have improvedor it may have gotten worse. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. 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. 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. Beyond that you can turn your cranking fuel down. 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. The Sniper ships with an OEM grade Bosch O2 sensor. 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. 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. I really want to go EFI this year. Is the Sniper EFI system rev-limiter capable. But I strongly suspect that is not the case. This is most easily done using the blue fuel pump wire. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. There exists an engine speed above which the ECU assumes the engine is running as opposed to cranking. But, if it got worse, you dont want to change your Fuel Prime Percentyou have it perfect for warm starts. 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. Thanks in advance. Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. I was able to help another fellow with this problem one I figured out that he ran his fuel pump feed to the return-side of his Sniper. FAIL!! These settings will be instrumental to a fast start. Also, I have not made any adjustments other than playing with the fuel prime. The Del City Time Delay Relay is pinned just like a normal relay. You can run resistor or non resistor plugs with the 6AL box. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. 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. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) Sounds like it is "only" burning through the initial priming shot. 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. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. 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. Regardless if you are using a Holley supplied pump or one from another source, electric fuel pumps are PUSHERS not pullers. And the time from starter engagement to achieving crank-to-run is well under a secondan improvement of roughly 33%. Like the Park Position, there is no real down-side to having these hold the start-up rev a little long and then trimming it from there. 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 Coolant Temperature starts at 106% and decays to 100% at 160 degrees. Super helpful and knowledgeable. Bradley Iger. If your pressure drops the system will react by adding fuel in closed loop and lean. 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. I figured it would be minimal. I'm worried that the engine will stall at idle. Unfortunately, I know NOTHING about throttle stops. 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