Will not restart once the car is Hot

Hi: I have a 1990 Iroc with a 5.0F TPI, manual trans. With about 130,000 kms. The car runs great when cold but after about 15-20 min. Of driving it starts to feel like it is misfiring or running on 7 cyinders, then you shut it off and it will not restart, cranks over fine but will not fire. Once it has cooled down it starts and runs fine till it gets hot.
Do you
have the same problem?
Wednesday, July 18th, 2007 AT 1:58 PM

1 Reply

The first things that come to mind are: 1. Coolant temp sensor on water pump sending back incorrect voltage to PCM*. 2. Thermostat is sticking or incorrect for your engine.
3. Battery condition and pay particular attention to the Bat. Ground connection at the engine block. It is often the last 2"-3" of cable that fails.
4. Check ignition coil output and ignition (spark plug) wires and replace if they are more than 5 years old.
A diagnostic test performed by a competent shop can save you money by not needlessly replacing parts. A bad PCM *(power control module) or PCM ground connection, can be the cause for inaccurate engine operation, and consequent poor performance. That isn't necessarily your problem, but if a code scanner or diagnostic engine computer could identify it as your source of trouble. So good practice dictates, establishing a base line, getting a correct diagnosis by a knowledgeable tech, followed up with correct repair(s), and that should resolve the issue for you.
Buying unnecessary parts, when the problem may be just a bad connection, would be folly, don't you agree?
All you need is the right repair shop and the money to pay for it, and your IROC Z should be a happy camper, once again. Good Luck :D
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Wednesday, July 18th, 2007 AT 2:57 PM

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