Cylinder 3 Misfire

[Fish]

I feel like normally I’m the one giving advice but I’m in a hard spot. I don’t drive the jeep everyday and really don’t every week.. well around a month ago I was headed to the dunes with my jeep and had to floor it to get past some cars in traffic and the check engine light flashed. It’s happened a couple times since under heavy acceleration (I can get it to do this every time) I checked the coil pack, and the fuel injector and both tested fine. Next up is plugs but those were done 4,000 miles ago so I’m guessing that’s not the issue either. The motor doesn’t have any lifter or rocker clanking or ticking so I don’t think it’s that either.. jeep has 105k miles on it I’ve owned it for 5k but in that time heavily modified it.

Short: Jeep gets misfire cylinder 3 under heavy acceleration. Not coil pack or Fuel injector. Pls help.

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[svtrit]

I had a P0302 in my wife's 2014 Town and Country 3.6L

I changed the coil pack, which made it better, but I still had a bad vibration. The code came back a few days later.

I pulled the left valve cover and found a very slight wear mark on my exhaust cam. First I changed only the rockers, as I intend on trading the van soon. It ran even better, but there is still an ever so slight vibration at idle, but no code anymore.

This weekend I am changing the exhaust cam on the left and then doing the rockers on the right, hoping I don't find a damaged cam on that side. Thankfully my left intake cam is not damaged, as that is the cam that is impossible to find.

 

[Fish]

I had a P0302 in my wife's 2014 Town and Country 3.6L

I changed the coil pack, which made it better, but I still had a bad vibration. The code came back a few days later.

I pulled the left valve cover and found a very slight wear mark on my exhaust cam. First I changed only the rockers, as I intend on trading the van soon. It ran even better, but there is still an ever so slight vibration at idle, but no code anymore.

This weekend I am changing the exhaust cam on the left and then doing the rockers on the right, hoping I don't find a damaged cam on that side. Thankfully my left intake cam is not damaged, as that is the cam that is impossible to find.

Any update? Did you get it fixed up?

 

[svtrit]

No. Once I opened up the right bank and saw the cams looked no different than the scuffed left one, so I changed the rockers and closed it back up. I still have the P0302 and a rough idle.

I have a Toyota Sienna on order now, as I am done with the old van.

I’m so frustrated with the 3.6L that I thought about trading the Jeep for the new van. It didn’t take long to realize what a stupid idea that is.

 

[mwilk012]

No. Once I opened up the right bank and saw the cams looked no different than the scuffed left one, so I changed the rockers and closed it back up. I still have the P0302 and a rough idle.

I have a Toyota Sienna on order now, as I am done with the old van.

I’m so frustrated with the 3.6L that I thought about trading the Jeep for the new van. It didn’t take long to realize what a stupid idea that is.

It’s a burnt valve. Needs a cylinder head.

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