Question about 1987 Chevrolet Corvette

2 Answers

Recently installed a new 383 motor in my Corvette. Had adjusted timing(minus light)and locked down at that position where the engine seemed to run the best. Engine starts and runs fine when cold but if I shut it off and try to restart with hot engine, it will not start and run. Have to wait until everything cools down for awhile. A major inconvience. Any ideas on what I should address first?

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  • weschroer Jul 10, 2010

    383 with TPI and modified chip will not start when engine is hot. Has no problem starting when engine is cold.

  • weschroer Jul 10, 2010

    Thanks - the injectors are the originals but I will try checking for advance with the timing light when the engine is cold and again after warming up.

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  • Chevrolet Master
  • 6,826 Answers

Have you checked the distributor's coil if it has this design?
What year is your Corvette motor?
Is it fuel injected or carbureted?

Posted on Jul 10, 2010

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  • weschroer Jul 10, 2010

    The engine is fuel injected and goes by the name of Tuned Port Injection. I also installed a modified chip in the ECM to compensate for the changes in displacement and performance. The coil sits on top the distributor (red & yellow wires). Not sure what arrangement you are referring to.

  • weschroer Jul 10, 2010

    Not sure what year the engine block is but the intake manifold and TPI setup is from 87.

  • Duane Wong
    Duane Wong Jul 10, 2010

    A question I would ask is if the injectors are leaking when hot causing the hard start condition.

    If the injectors were new, however, this probably is not the cause.



    Hm.



    Could the chip that you are using be not the right one for your setup? I mean is it advancing the spark too far when it is warm vs. cold? You might be able to check this with your timing light, to see the difference in advance when it is starting cold vs. starting hot.



    If you have any other comments on this feel free to do so and I will try to help with the problem you have.



    Thanks.



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  • Master
  • 11,896 Answers

Choke could be screwed up.

Posted on Jul 09, 2010

  • weschroer Jul 09, 2010

    Forgot to mention that this engine has tuned port injection. No choke that I'm aware of.

  • Nate Stansfield
    Nate Stansfield Jul 10, 2010

    crank or cam sensor could do this. When it's cold and doesn't start, a cold start injector, but when it's hot, could be cam or crank senosor or vapor locking

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