Dodge

10

Asked by Aug 17, 2019 at 01:21 PM about the 2008 Dodge Magnum SXT RWD

Question type: Maintenance & Repair

Cylinder 4 misfire
I have a 2008 Dodge Magnum 2.7 VIN T 24 valve.i
bought the car and the only code was cylinder 4
misfire p0304 but it only misfired on cold start
once it warmed up to operating temperature it
smoothes out and idles excellent and drives
excellent slow or fast.we replaced all coils, spark
plugs (correctly gapped)and injectors yet still every
morning same problem I was told it was the head
gasket leaking coolant into cylinder 4 over night
which is why cold start it was misfiring on that
cylinder and ran fine after it burned up all the
coolant in the cylinder itself which made sense to
me so I replace the head gasket which did in fact
need replaced also had a head bolt broke off into
engine block so I replaced the engine had the
heads resurfaced, pressure tested, honed out all 6
cylinders put new head gasket ,cleaned pistons,
new pistons rings ,new head bolts, new timing
chain kit, new engine mounts, new cam and crank
sensors and much much more.still I put it all back
together and still get cylinder 4 misfire but only on
cold start after it warms it is done misfiring.
anyone think they know what could be the
cause????

2 Answers

117,015

Try putting a spark plug anti fouler on cylinder number 4. I'm thinking a dripping fuel injector or worn valve guide seal on that cylinder is letting oil run down the valve stem and onto the spark plug tip causing it to be fouled out until the engine warms up and burns off the excess fuel or oil from the spark plug. Hope that helps! Jim

10

Thanks Jim but not only does it have new valve stem seals the # 4 spark plug has no oil smell or burnt oil residue and the injectors and o rings are brand new and installed also 24 brand new lapped valves

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