Question about 1987 GMC V1500

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Truck turns over but won't start 87 gmc 4x4

I did a tune up, new spark plugs, plug wires, distributor cap and rotor, went to start and it would not fire up, but would turn over. Checked and re-checked my work, re-installed all old stuff except plugs. Checked coil for defects reference haynes manual. measured resistance of the plug wires and the old bosch wire had a resistance ten times lower than the new carquest ones. ex; coil wire to the distibutor cap 8 inches in lenght, bosch 500 ohms car quest 4500 ohms and the same ratio for the rest of the wires longer wires higher resistamce. Did I blow something THis problem has never happened in seven years. I'm stumpped???

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Well, if it was running prior to your replacing the plugs, then somewhere you went amiss. Check the firing order. If when you crank the engine over and it pops and backfires then you have a few plug wires mixed up. Other than that the other item to check would be the rotor button in side the cap. Is it lined up correctly or broken? Good luck.

Posted on Feb 07, 2009

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