3.6L Misfires - p0304 code

[Chris1349]

I have 2019 Jl 3.6, started having code p0304, and rough idle at cold start up then it would run smooth after warm up. Changed all plugs and coil packs under intake. Ran good for couple days then started back with rough idle and p0304. Went back pulled plugs and number 4 cylinder spark plug was wet. Next changed injector, got all back together, ran good for couple days, then back to rough idle and throwing code. Checked compression and all cylinders is 150. Any ideas or help would be appreciated. Thank you.

Sponsored

 

[Vanburi]

Wet with oil or fuel?

 

[mwilk012]

Wet with what? Sounds like a failed coil, or god forbid, leaking head gasket.

 

[Chris1349]

Plug was wet wet with fuel. Also is now throwing p0300 code. I can also hold paper over exhaust pipe on cold start up it will suck it into exhaust until warms up. Maybe a valve sticking.

 

[mwilk012]

Plug was wet wet with fuel. Also is now throwing p0300 code. I can also hold paper over exhaust pipe on cold start up it will suck it into exhaust until warms up. Maybe a valve sticking.

Yea, it’s probably not that. Did you move the ignition coil to a different cylinder?

 

[Chris1349]

No replaced it with new one.

 

[mwilk012]

No replaced it with new one.

Lost any coolant? Sounds like the same problems lots of Pacifica owners had been having.

 

[Chris1349]

Nope, no lost coolant.

 

[RubberFrog]

Did all this start after your last fill up?

 

[Chris1349]

Nope, before. It all started with little bit of rough idle at start up, and the auto start stop light would come on. Everything just kept getting worse

 

[Carl H]

When that happened with my 3.6 in my 2013 model, it’s pretty much the exact same motor found out the synchronizers went out ended up having to replace the whole motor. You may want to give that a look before it gets too bad.

 

[Royalnation]

Did you find out the issue with this code?

 

[Chris1349]

Yes, blown head gasket, was replaced by dealer, and 14,000 miles later blown again.

 

[mwilk012]

Yes, blown head gasket, was replaced by dealer, and 14,000 miles later blown again.

One head, and then the other?

 

[Chris1349]

Same head, same cylinder misfire, rough idle, this time losing coolant with no leak. But dealer says they can't find any problem.

Sponsored