Question about 1996 Chevrolet C1500

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I have a 1996 c1500 with a 305 it will start and run for about 3 mins than start running rough and then shut have to wait about an hour before it will start again

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  • mark May 11, 2010

    now i have no spark and the icm is next to the coil.


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It sounds like you have done everything right sometimes new parts are bad. looks like you should test the icm and coil pack to see if they are ok. i saw the other response you had did you check wires coming to icm. any corrosion or problems from condensation as posted? any indication computer is a problem? did you run a scanner on vehicle? good luck thanks for using fixya

Posted on May 15, 2010

  • mark May 15, 2010

    Did the scan with my ob2 the only thing it came up with was the mass air flow senser.I don;t think that,that would stop it from not getting fire.How can i check to see if iam getting pulse out of the crank trigger?And would that make it not have pulse on the injector side also?Thanks for the help so far Mark

  • Joseph Gargani
    Joseph Gargani May 16, 2010

    are you sure there is not a fuel delivery problem? have you tried starter fluid into the air lines while attempting to start the engine? need to rule out that side of the problem.


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Replace the fuel filter first and inspect your ICM (Ignition Control Module). Faulty ICM will fail when it starts to heat up and the engine will do what you have described.
Start with the simple and replace the fuel filter and have the ICM tested and replaced if it's bad. The wire leads to the ICM is also know to go bad from corrosion due to condensation that forms under the distributor cap.
Thank you for using fixya and keep us posted.

Posted on May 10, 2010

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