1994 Z28 LT1 dies when warm
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Joined: Jul 2018
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1994 Z28 LT1 dies when warm Good morning! Been searching for help on my current issue, figured I’d post and see if I’m headed in the right direction.
the car:
1994 Camaro Z28 LT1
new coil, icm with spacers behind the mounting plate, new fuel pump relay
automatic (just in case it matters)
the issue:
car cold starts and runs great, but as soon as it gets to operating temperature (whether driving or just parked in the driveway running) it stalls. No stumbling before that, literally like I flipped a kill switch. If I spray starter fluid in the intake it will start off of that, otherwise it will crank endlessly but not start until it has completely cooled off. I’m thinking that it must be the fuel pump but figured I’d ask for some help in case I’m headed in the wrong direction.
the car:
1994 Camaro Z28 LT1
new coil, icm with spacers behind the mounting plate, new fuel pump relay
automatic (just in case it matters)
the issue:
car cold starts and runs great, but as soon as it gets to operating temperature (whether driving or just parked in the driveway running) it stalls. No stumbling before that, literally like I flipped a kill switch. If I spray starter fluid in the intake it will start off of that, otherwise it will crank endlessly but not start until it has completely cooled off. I’m thinking that it must be the fuel pump but figured I’d ask for some help in case I’m headed in the wrong direction.
Put a fuel pressure gauge on the Schrader valve. Run the car without vacuum on the fuel pressure regulator. Pressure should be between 43 and 45ish PSI. If it starts off starter fluid then most likely your pump is overheating and dying. Have you replaced it before? If so, did you reuse the fuel pump bucket?
Thread Starter
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Joined: Jul 2018
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Thanks for your reply. I just went out and tested the fuel pressure with the key in the “on” position and I have 43. Unluckily for me I ran it earlier so I can’t test pressure while it’s running until it cools down. Interesting side note; I disconnected and plugged the vacuum from the pressure regulator and instead of just cranking it stumbled and sputtered but still wouldn’t start. I’ve never changed the pump, and I haven’t cut the trap door yet at this point.
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Joined: Apr 2008
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sounds like a fuel issue....ideally you would have a FP gauge with a hose on it long enough so you can see it while driving (tape gauge to windshield) to determine if it suddenly drops "before" the engine stalls
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If there is some way you could fill the tank I'm curious to know if the issues would go away. Reason being is the fuel pump should always be submerged in fuel for cooling purposes, which is why the pump is in a bucket so when the fuel level drops it can still be cooled. If the bucket isn't there and the fuel level drops it will heat up the pump. It's not really relevant since the pump should be replaced if it is indeed the culprit.
