Runs for a sec, then dies
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
Runs for a sec, then dies Just got through hooking everything up in my new project. Engine will run for about 3-5 seconds then dies. Fuel pump keeps running the whole time. I heading to the parts store to pick up a fuel pressure tester and a regulator in case it is bad. Fuel pump is new so thats why I'm suspecting the regulator.
Anything else that it could be? Need to check for?
Anything else that it could be? Need to check for?
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
OK, got the pressure gauge on it. Maintains 43psi before cranking but the pump is running cponstantly. After it cranks, psi drops to 33-35 then the engine shuts off. I undone the pump and it is bleeding off pressure.
I haven't got the pressure reg on it yet. Just waiting for the part to arrive. I got a buddy picking it up for me. Hope that fixes it.
Is it possible for an injector to be hung open??
I haven't got the pressure reg on it yet. Just waiting for the part to arrive. I got a buddy picking it up for me. Hope that fixes it.
Is it possible for an injector to be hung open??
Sounds like a vats problem. Is this a retrofit of an LT1 into an older vehicle?
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TECH Regular
Joined: Apr 2007
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From: Kempner, TX
No, it's not VATS. A VATS problem won't let it run even for a few seconds.
Let's start off with you identifying the year of the engine and what mods, etc. you've recently made.
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
Let's start off with you identifying the year of the engine and what mods, etc. you've recently made.
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
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Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
No, it's not VATS. A VATS problem won't let it run even for a few seconds.
Let's start off with you identifying the year of the engine and what mods, etc. you've recently made.
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
Let's start off with you identifying the year of the engine and what mods, etc. you've recently made.
Jake
West Point ROCKS! Nation's TOP COLLEGE per Forbes Magazine!! Graduation Day Parade 20 May 2010!!!
Once I get her running right, all that is needed is the interior.
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Verdad Gallardo Vats wont cause the vehicle to start and stall??????? A VATs issue will definitely allow it to run and stall out after a few seconds. In a stock application (no retrofit) where the starter system runs through the BCM, VATs typically will cause a nocrank situation. But in a retrofit, if the PCM doesnt see that 50hz signal its looking for, it will cold pulse the injector when the key is turned on, then not fire the injectors because it doesnt see the signal. Resulting in a start and stall out within a few seconds. Not saying that is the problem here, just sounds like a good bet, especially if he hasnt had it turned off!
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Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
A VATs issue will definitely allow it to run and stall out after a few seconds. In a stock application (no retrofit) where the starter system runs through the BCM, VATs typically will cause a nocrank situation. But in a retrofit, if the PCM doesnt see that 50hz signal its looking for, it will cold pulse the injector when the key is turned on, then not fire the injectors because it doesnt see the signal. Resulting in a start and stall out within a few seconds. Not saying that is the problem here, just sounds like a good bet, especially if he hasnt had it turned off!
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
PCMforless just got back with me. Everything sounds promising but I was curious about something they told me. Seems they need to put the comp in the "open loop" program due to me running open longtubes all the time.
Won't the open loop hurt performance?
Won't the open loop hurt performance?
Do they have a base program they can use for a stock engine? If so, then you should be fine since the engine is stock. You just need to definitely use premium fuel since the knock sensor will not be operable (and that's if you have one on the block). The only way to get around using closed loop is if you use the 02's and all active sensors to close the diagnostic circuit. If you are real concerned about it you can always get it dyno tuned...
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
Do they have a base program they can use for a stock engine? If so, then you should be fine since the engine is stock. You just need to definitely use premium fuel since the knock sensor will not be operable (and that's if you have one on the block). The only way to get around using closed loop is if you use the 02's and all active sensors to close the diagnostic circuit. If you are real concerned about it you can always get it dyno tuned...
A dyno tune is in the future but I'm gonna wait till I can get some heads and cam.
An open loop tune won't hurt performance really, but looking at your setup I think a closed loop tune will be fine. If your O2's are in the collectors, you look like you have enough tubing to keep any fresh air away from the O2's causing them to read a false lean condition.
Just to understand correctly, are they saying you have to run in open loop because you are running long tube headers?
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"open" long tube headers, which he really isn't. If you are running open long tubes, meaning no pipe after the collector, you need to stick with open loop because your O2's will be useless.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 76
Likes: 0
From: Georgia
I'll shoot them an email and see what is said.