Quote:
Originally Posted by FRSBRZGT86FAN
Has anyone thought of unusual valvetrain issues?
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Yes. But it it doesn't fit well for your problem...
We still don't have enough information.
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steve99 was correct in saying if there's a bad component in the valvetrain, you will likely have a related code...
If the variable cam actuators are anywhere in their mechanical range stuck or uncommon dedicated you shouldn't get serious afr imbalance sufficient to fold the plugs, it'll just run and idle like sh*t.
Little while ago a guy broke a valve spring. That won't throw a valve train related code, but you will have rough idling, afr issues, and random/multiple cylinder misfires.
Still want to know which plugs are fouling...
Theoretically, if you had a bad coil, the associated plug would foul, but the ECU on this car uses a crank speed variation algorithm to determine misfire, and you would have at least 1 misfire code.