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1997 lhs 3.5 p0306
As title say p0306 cyl 6 misfire. Only misses for about 15-20 secs and only after setting over night. But it will eventual turn on check engine light. 168,000 miles new plugs and Chrysler wires 6 months ago. Replaced number 6 plug and wire again. Ran wire over intake plenum. Have checked for vacuum leaks get no hint of a leak. Went so far as to plug off the brake vacuum line. Still a miss for a few seconds only on a stone cold start. Did a power clean on the injectors. That did keep the light off for about 3 week. After the initial start up miss it runs perfect. I am pretty much at a loss. Any ideas. If I do have to pull the plenum I will put in new injectors. I do have a new coil pack may try that. Any ideas |
Sounds like you have #6 cyl. leaking down overnight(not holding system pressure). That will partially flood that cyl. on initial start and the injector should be replaced.
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Better to test the injector to see if it is leaking before condeming it. Don't replace parts unless you know it is bad.
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