Car only runs for 3 seconds- LT1
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
Car only runs for 3 seconds- LT1 This is my last shot to find out what's wrong with my car before I send it off to my tuner for him to figure out.
I have a 94 LT1 with a 2-bar SD tune. Completely new motor with a turbo setup. My car will only run for 3 seconds at a time. I can start it right back up after it shuts off. No hesitation, runs good, but just cuts off.
VATS has been disabled. My fuel pressure is solid when the car is running. Fuel pressure does bleed off rapidly when the pump turns off but I have narrowed that down to the seat inside the fuel pressure regulator. It's not a very good seal so fuel passes by the seat and the metal ball.
I have made a few logs and tried a few different tunes from my tuner. Nothing is working. I have read on here about people having issues with the MAF despite the fact they are SD tuned. That would be one thing I would like to look at if someone can guide me. I use Tuner CATS by the way.
I have a 94 LT1 with a 2-bar SD tune. Completely new motor with a turbo setup. My car will only run for 3 seconds at a time. I can start it right back up after it shuts off. No hesitation, runs good, but just cuts off.
VATS has been disabled. My fuel pressure is solid when the car is running. Fuel pressure does bleed off rapidly when the pump turns off but I have narrowed that down to the seat inside the fuel pressure regulator. It's not a very good seal so fuel passes by the seat and the metal ball.
I have made a few logs and tried a few different tunes from my tuner. Nothing is working. I have read on here about people having issues with the MAF despite the fact they are SD tuned. That would be one thing I would like to look at if someone can guide me. I use Tuner CATS by the way.
I'm guessing you don't get any codes? Does it shut off like someone turned the key off or does it sputter and then die? Can you keep it running if you play with the throttle? If you suspect the MAF just unplug it and try it
Thread Starter
Joined: Oct 2005
Posts: 1,687
Likes: 0
From: Fairfax, Virginia
I did get a code 34 MAP Low. It's not setting that code anymore for some reason. Key ON engine OFF my MAP KPa is 54.3. Then it's in the range of 31kpa-54kpa when the car runs. Is this normal readings for a 2-bar map?
It doesn't sputter and stall out when it shuts off. Just straight up cuts off no matter what throttle I give it.
I don't have a MAF anymore. But I mentioned that because I read of people having to turn off MAF settings in the PCM when they are SD tuned. Granted those are ls1's using hptuners so my pcm is probably completely different.
It doesn't sputter and stall out when it shuts off. Just straight up cuts off no matter what throttle I give it.
I don't have a MAF anymore. But I mentioned that because I read of people having to turn off MAF settings in the PCM when they are SD tuned. Granted those are ls1's using hptuners so my pcm is probably completely different.
Thread Starter
Joined: Oct 2005
Posts: 1,687
Likes: 0
From: Fairfax, Virginia
I tried out a new 2-bar map. Still won't stay running. I have a new PCM coming in case something is wrong with mine. If that doesn't fix it then I'm all out of idea's.
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Verdad Gallardo Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
But I have no choice but to use a 1bar OS correct? Just making sure your not getting at something.
As far as I know, all the signals getting to the PCM that I can view with my datalogger are normal. I don't see anything wrong mechanically with the motor either. So what else does that leave that could cause this?
As far as I know, all the signals getting to the PCM that I can view with my datalogger are normal. I don't see anything wrong mechanically with the motor either. So what else does that leave that could cause this?
But I have no choice but to use a 1bar OS correct? Just making sure your not getting at something.
As far as I know, all the signals getting to the PCM that I can view with my datalogger are normal. I don't see anything wrong mechanically with the motor either. So what else does that leave that could cause this?
As far as I know, all the signals getting to the PCM that I can view with my datalogger are normal. I don't see anything wrong mechanically with the motor either. So what else does that leave that could cause this?
Jon
Thread Starter
Joined: Oct 2005
Posts: 1,687
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From: Fairfax, Virginia
Hey Jon. Ed at VA Speed is who did the tune for this setup. I already paid them for it and then they were going to do my dynotune once I broken in the motor and have everything ready. Now that I can't get it running, they're going to figure it out and I'll have to pay them to do the multiple fluid changes and whatnot that goes into breaking in a new engine, trans, and rear end. I wasn't planning on it as I like to do all the work myself, but it is what it is.
This Thursday is when I plan on trailering my car down there. I feel like I have done all that I can.
This Thursday is when I plan on trailering my car down there. I feel like I have done all that I can.
That sucks Mitchell. Good luck and keep me in the loop. Also, if you want to send me some finished engine bay pics for my web page, that would be great.
jon@lt1boost.net
jon@lt1boost.net
