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I Cured A Random Misfire Problem-3800 V6


95oldsVan
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Solution for me. Installed new premium AC Delco wires, put heat shields back on, no misses yet. Still running with disconnected solenoid. But I can accelerate again! 

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On 4/12/2021 at 5:49 PM, GTPsurvivor said:

Solution for me. Installed new premium AC Delco wires, put heat shields back on, no misses yet. Still running with disconnected solenoid. But I can accelerate again! 

^^^WINNER.

The problem is NOT the heat shields.  It's faulty plug wires.  GM made a bazillion of those engines, and they were guaranteed to meet emissions regulations (i.e., no misfires that produce high HC and kill the catalyst) for 50K miles.)  The heat shields were designed-into that system.  Yes, they'd provide a ground path if the plug boot were faulty.  Removing the heat shields does not make the plug boot less faulty, it just removes an easy ground-path for the spark.

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  • 3 weeks later...

Remember, thousands of years ago, when spark plug porcelains had "flashover ribs" to reduce that sort of problem?  Now, plugs are smooth-sided.  You found out the hard way what happens next.

I guess the plug engineers managed to shave off half-a-penny by producing plugs with no ribs.  Thank God for progress!

 

Another reason that dielectric silicone grease is essential.

Edited by Schurkey
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