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Discussion Starter · #1 ·
About 2k miles ago I got a cylinder 2 misfire code. Took it to my local dealership where they came back and told me it was actually cylinder 3 and they replaced the spark plug and coil. Now I'm getting another cylinder 2 misfire code and rather than spending $350 I'm considering replacing it myself for $40. Two primary questions:

  • Is it even worth going back to the dealership and trying to argue that they misdiagnosed or is it a lost cause?
  • Should I replace the other spark plugs when I have the plenum off? I've got 60k miles and only 3-4 hours at night to work on the jeep. Should I just wait?
 

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Discussion Starter · #3 ·
I would do all of them but depending on your year it might be the cylinder head itself not just the plugs.

here are some other ideas.https://www.700r4transmissionhq.com/p0302-jeep-wrangler/
Thanks! I should have mentioned that it is a 2015. I originally made a stink about the fact that I was getting a misfire, that te heads are known to crack and that my coolant had to be topped off ~6k miles ago because it was very low. They told me I hadn't lost any coolant since they topped it off. Maybe I should do an oil analysis? They also told me the 2015s weren't part of the TSB.
 

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Most likely cylinder head. Should be covered by your power train warranty.
 

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Discussion Starter · #5 ·
Thanks. I stopped by the dealership and spoke with the service manager. I told him about my concern that the first check engine code was a P0302 (even though they diagnosed it was cylinder 3) that it is now coming up again and that I'm worried the head is cracked. I know they probably don't want to hear from a customer (who isn't a mechanic) about what the issue might be, but the service manager agreed that it might possibly be a cracked head and that they would do a compression check. Is a compression check sufficient enough to detect a cracked head? Any advice on how I should handle?
 

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Thanks. I stopped by the dealership and spoke with the service manager. I told him about my concern that the first check engine code was a P0302 (even though they diagnosed it was cylinder 3) that it is now coming up again and that I'm worried the head is cracked. I know they probably don't want to hear from a customer (who isn't a mechanic) about what the issue might be, but the service manager agreed that it might possibly be a cracked head and that they would do a compression check. Is a compression check sufficient enough to detect a cracked head? Any advice on how I should handle?
Hi Emerscape,
Please let us know via private message if you need any additional assistance while your dealer works on finding a potential solution to this. We're happy to help!

Lydia
Jeep Social Care Specialist
 

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Discussion Starter · #7 ·
Hi Emerscape,
Please let us know via private message if you need any additional assistance while your dealer works on finding a potential solution to this. We're happy to help!

Lydia
Jeep Social Care Specialist
Lydia - thank you for reaching out! I didn't know that Jeep Cares was active on this forum, but I'm really glad you reached out.

Brought the jeep in this morning and just got the call saying that they found an issue with the head and that they will be replacing next week under warranty. Knock on wood but I'm happy that they are taking care of this and can't wait for my jeep to be back to normal!
 
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