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ROLAND ... 5/8/2011
1990 Pontiac Tempest Base 6Cyl3.1L - Engine
Gentlemen, my sparkplugs burn black like charcoal, and engine misfires while in park
Gentlemen , my sparkplugs burn black like charcoal, and eventhou the engine runs, rev, and pick-up good, still it happens to misfire while in park. I have changed sparkplugs and wires, motor oil and filter. Also added fuel injector cleaner to gas.What could possibly be wrong?
Thanks in advance
1 Answer
  • TechSam
    TechSam 5/8/2011
    Bad fuel pressure regulator, fuel pump pressure too high, Bad air filter, bad O2 sensors, bad temp sensor or mass air flow not reading.

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