gmc missfire problem
gmc missfire problem
i have a 06 gmc envoy with a random missfire code. i only have problems when the temperature is cold outside when starting. once motor reaches 200 degrees it will run just fine. ive replaced spark plugs, had a bg fuel injector cleaning done on it. now i'm lost.
Re: gmc missfire problem
when the engine is cold it is harder for the spark to jump across the plug. It will look for an easier way to ground if it can find one. When was the last time plugs and wires were replaced? it could be that they are starting to break down. Just food for thought.
an intake leak is also very common for these motors. when the parts are cold the leak may be more evident. as the engine warms up and parts expand from the heat and the computer takes over the fuel mixture the leak may not be as noticeable.
an intake leak is also very common for these motors. when the parts are cold the leak may be more evident. as the engine warms up and parts expand from the heat and the computer takes over the fuel mixture the leak may not be as noticeable.
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Re: gmc missfire problem
the plugs are new. i'll check for air leaks. Thanks
Re: gmc missfire problem
I have also had it where the injectors are a little dirty and will cause a very slight miss that you might not even feel but the computer will register a random misfire code. In injector cleaning like a motor vac can clear this up
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Re: gmc missfire problem
update; the intake manifold bolts will loosen up over time. some were ready to fall out. i just snugged the bolts back up and it fixed the problem
Re: gmc missfire problem
Congrats,
thanks for letting us know what it was
thanks for letting us know what it was
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