Question My Firebird hesitates under 2,000 rpm. Runs fine over 3,000 rpm. I Get code 0306 on OBD for number 6 cylinder misfire. Car will die coming to a quick stop at light once or twice a month.
Changed spark plug, no change, then injector, still no change. Switched front 2 coils to see if problem moved to number 2 cylinder but I still get code 0306.
Could the spark plug wire be causing this or is there something else I need to check? Car has 54,000 miles on it and was running fine before. Maintenance is done regularly.
Appreciate any insight to help me figure it out.
Sincerely,
Mike Wilson
[email protected]
AnswerHi
Could very well be plug wire. They are know for cracking due to them being ran VERY close to Exhaust manifold(s)
It also may be a mechanical problem, a weak cylinder.
(Worn cam lobe, low compression, sticky valve). Anything that can cause a cylinder to misfire.
You MAY also see if the injector is pulsing (with a noid light). May be a wire issue.
The ignition module I have also seen cause a single cylinder misfire, dont why on these systems as they are waste spark. But I have seen it before.(with assistant, start engine with #6 plug wire removed at coil AND a test light hooked to ground, about 1-3 inches away from the coil tower. See if it can jump a good 2-3 inch gap (Should be able to At least 2 inches).have an assistant shut car off. Dont let the spark "fly" around keep it contained with a grounded light.)
I would really check that plug wire first, though.
And as I always say, if you do not feel comfortable doing this work, take it to a good shop YOUR familiar with and trust and have it done.
Hope this helps.
Good Luck
Pawl
