02 Chrysler van 3.8 came in with blown head gasket and a check engine light for misfire no1 cyl. Installed new head gasket new rebuilt heads plugs wires started up still misfire 1 and now 4

1-2-3-4-5-6
Head (horizontal)
135
246

Coil (vertical)
6 3
4 1
2 5

You have an interference motor. If you had to replace the heads due to the valves possibly touching the motor, you have to consider rechecking the compression after you replaced the heads. I had the same motor that had an intake leak. I found frozen rings on the number 1 piston as well as a bent pushrod. Ultimately, the camshaft had broken due to coolant getting to the bearings. If the spark is good, the fuel is good, then the only other problem you'd have would be compression.

did you have the heads milled or just throw a set of gaskets on it?You did put new spark plugs in it rite?

you mean the injector # 3 was dry ? Is that injector connector plug-in, wires ok ? do anything different ? Is harness ok ? Is plug wire ok ? you need to make sure you have power thru and to #3 , even new wires can be bad ! check for a short, continuity, and good ground. any codes stored in the ECM ?

Do a leak-down test or at least a compression test

head gasket blown or warped heador cracked head on engine

Have a compression test run to see if you have a burnt valve or blown head gasket. If you are seeing white smoke out the exhaust, and are loosing coolant with no apparent leak, you have a blown head gasket. You may also have a defective fuel injector.

hello, The 300m's all have individal coil packs for each cylinder. They pretty much sit right on top of the spark plug and have a long boot that goes down into the head onto the spark plug. If you have not replaced the one on cylinder #4 I would do so and that will probably fix your problem. It is held down by 2 torx screws. They are around $85 bucks at the parts store. Hope this helps

Hello...

Sounds like you have a blown head or intake manifold gasket.

Good Luck


Drumbe

i think he is wrong ....check plugs wires and for vacuum leaks common for intake gaskets i have changed 3 this year and all had cyl misfire related codes