Question about 1990 GMC C1500

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Engine will not start

My 1990 1500gmc truck 350 engine is not getting any spark and gas what could it be

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Ecm/pcm. i have replaced mine twice in the lifetime of my truck. i have a 1990 gmc suburban. the pcm controls both. it only cost about $90.00, but b4 you do that check all of your grounds. i have seen that when there was a main ground that was loose or corroded everything would power up, but it wouldn't start/run.

Posted on Sep 16, 2008

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Don't know what that switch would be, but sudden no starts are usually fuel or ignition spark related-one of them is not getting to the cylinders. See if you have a strong blue spark on a spark plug wire. If no spark, possibly a bad ignition coil or a bad TFI module on the side of the distributor.
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I would check for spark first with a spark plug tester. They are about $10 bucks and very easy to use. Then check all spark plugs for massive wear, and then check all spark plug wires for breaks or burn holes from motor. If not any of these, then I would check to timing belt. Once you diagnose these things, get back to me and we'll go from there. Good luck. P.S. Did the check engine light ever come on?

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Sound like there is no gas or little enter the engine.

-Check gas presure and any gas in the carburator?
Yes. The internal pump is won out. Need to replace it.
Q: Where is the internal pump...?
A: It's inside the carburator. (It looks like the toilet plunger)
You can't see untill the cover has been remove.

mai lor

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1 Answer

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NEED COUPLE THINGS TO RUN GAS ENGINE NEEDS FUEL SPARK COMPRESSION. FIND WHICH ONE YOUR MISSING AND WE CAN GO FROM THERE

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Good luck.

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1 Answer

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