Question about 1993 Chevrolet C1500

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How to troubleshoot 1993 chevy Z71 pcm

Mike i have a 1993 Z71 with a rebuilt 350 the problem that i have is that the truck died while driving it started to backfire when i would accelarate then the engine died no spark to the plugs, i have replaced the distributor the coil and the truck will not start no spark i have 12v to the coil coming from the ignition switch the ecm fuse inside the truck is good i have fuel pressure how do i know if the pcm is the problems?

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  • cstibbits May 19, 2009

    Have a 93 Z71 and the engine has been sitting for awhile but it ran good before I parked it, just put in rebuilt transimission headers but need to get it running before driving to have new exhuast trying to start with straight headers...The engine will start sometimes but I have to paddle the throttle to keep it running...will not idle and cannot rev high or it this an electrical issue after sitting for so long, bad sensor or something....and can I reset the computer so I can start with fresh error codes..

  • david moss Dec 25, 2012

    The temp sensor on the upper filler neck will make it do that

  • billy smith Feb 10, 2013

    mine runs good till it get hot then when u floor it ,will go good then boog down ,ive changed everything i that is ,wat else could it b



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Hi Nsilguero,

I apologize for the delay in responding.

From your description, I'm leaning toward a timing chain problem, first stretching, then skipping and finally breaking.

If you're getting voltage to the coil and still getting no spark, there is a test I'd like you to try.

Take off the distributor cap and have someone turn the engine over while you eyeball the rotor. Is it spinning?

This going to take some back and forth interaction. Comment me back with the results. We will proceed from there.


Posted on Jan 17, 2009


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