Misfire

[joshuahughes486]

Hey I have a jku with 150k miles. It’s started a misfire and there is no codes. I bought the coil pack spark plugs and wires. What else can cause a slight misfire? Thanks.

 

[Dirty Dog]

It shouldn't be possible to have a misfire and not throw any codes, unless it is a really rare misfire. Any miss that's bad enough for you to notice would certainly throw a code. What symptoms are you experiencing?

 

[joshuahughes486]

It shouldn't be possible to have a misfire and not throw any codes, unless it is a really rare misfire. Any miss that's bad enough for you to notice would certainly throw a code. What symptoms are you experiencing?

It’s very slight. You can feel it when you are just idling. No real symptoms just slight feel.

 

[JeepJeezy]

Plugs, coils and I'd run some injector cleaner through a couple tanks of gas too.