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Re: 1994 vette runs great for 30 min then keep cutting...
Sounds like the Opti-Spark distributor on front of engine is defective that is the most common issue. Sold my Vette and have a spare new one for sale, want to buy it.
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Have you tried replacing the fuel pressure regulator in your EFI (carburator) Sorenson sells a kit that has all the gaskets, screens and regulator for around $30.
Check the fuel delivery system and as well as the ignition system (Ignition coil, spark plugs gaps, high tension cords resistance and the igniter amplifier assembly).
Yuck, that sucks. best guess is malfunction in the body control module circut. factory anti theft uses ground circut disable to keep the car from running without the key. try disconnecting the negative battery cable, wait 10 min. and remove the BCM fuse and any fuse that is related to the vehicle security system. re-connect the battery and try it. if it runs the the fuel pump most likely has a ground issue that was overlooked during replacement.
i have a 1990 vette doing the exact same thing. i have checked; fuel pressure, replaced fuel filter, checked spark, checked engine vacuum and i still cant seem to get the car to run once it's up to temp. any help on this would be great.
1. Check the Fuel Pressure Regulator. No sign of fuel should exist when the vacuum hose is pull out.
2. Check the relay (one by the side of dashboard and one in the fuse box engine bay) for the fuel pump and the injection system.
check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump
I have heard that in some vehicles, when the coil warms up, it operates sporadically. When the engine dies and it cools back down it operates fine until it heats up again and fails. This could be your problem.
is it fuel injected? you might have a faulty sensor it sounds like a vapor lock, also you fuel injectors might be dirty or bad also check fuel pump pressure or a cloged fuel filter, or it is putting to much gas if your vette has a carb.
I had the same problem. Turns out,( and I didn't believe it when I was told) but, my problem turned out to be cheap (inferiour) plugs and wired. I was reccomended to use NKG plugs and Borg-Warner wires.
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