300M, Concorde, LHS, New Yorker Discuss the Chrysler LH platform cars within.

1997 lhs 3.5 p0306

Old 09-21-2018, 10:29 PM
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Join Date: Mar 2008
Posts: 6
Default 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
Old 09-22-2018, 06:21 AM
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Join Date: Jul 2017
Location: Western NY
Posts: 811

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.
Old 01-02-2019, 12:22 PM
Junior Member
Join Date: Dec 2018
Posts: 8

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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