2015 misfire HELP

[JeepKreep]

Hello! I just recently purchased a 2015 jku with 130,000 miles. I bought it knowing the engine light was on thinking I could fix it with a few parts. Its a good clean ride completely stock. It’s throwing codes p0300 and p0302.. (misfire in cylinder 2)

Thing is it runs and sounds just fine. If the light wasn’t on I would’ve even suspect anything to be wrong.

First we replaced the coil after noticing the plugs were recently replaced, cleared the codes and the light popped on the next day.

I ordered mopar brand plugs and replaced all 6 plugs, cleared the codes and the light popped back on within 20 minutes.

We found that whoever had the Jeep before had 3 different brand of plugs in it. Which tells me they couldn’t figure out the issue either and just traded it in.

Has anyone had a similar issue that figured it out?

 

[BLACKJKU]

Hello! I just recently purchased a 2015 jku with 130,000 miles. I bought it knowing the engine light was on thinking I could fix it with a few parts. Its a good clean ride completely stock. It’s throwing codes p0300 and p0302.. (misfire in cylinder 2)

Thing is it runs and sounds just fine. If the light wasn’t on I would’ve even suspect anything to be wrong.

First we replaced the coil after noticing the plugs were recently replaced, cleared the codes and the light popped on the next day.

I ordered mopar brand plugs and replaced all 6 plugs, cleared the codes and the light popped back on within 20 minutes.

We found that whoever had the Jeep before had 3 different brand of plugs in it. Which tells me they couldn’t figure out the issue either and just traded it in.

Has anyone had a similar issue that figured it out?

Sometimes it can be a dirty connector, or damaged pin in the connector.

Sometimes a ECM reset is necessary after replacing parts.

 

[JeepKreep]

Sometimes it can be a dirty connector, or damaged pin in the connector.

Sometimes a ECM reset is necessary after replacing parts

Sometimes it can be a dirty connector, or damaged pin in the connector.

Sometimes a ECM reset is necessary after replacing parts.

We checked the connectors while we had it apart. They checked out.

 

[pole_cowell]

We checked the connectors while we had it apart. They checked out.

I have been having the same problem on cylinder 3.

I replaced the spark plug and coil pack to no avail.

The shop I go to replaced the fuel injector for cylinder 3 and that helped for a few days.

I would check your injectors. It wasn't my problem but it might be yours.

 

[1Graeman]

We checked the connectors while we had it apart. They checked out.

Might I refer you to this current thread that is going on about this exact same issue. 3.6 Pentastar Misfire on Cylinders 1, 3, & 5