Misfire help

JoyGonzalez

JoyGonzalez

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Joined
Jul 21, 2020
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2
Location
CA
We could use some professional help at this point.
We started off with a number 2 cylinder misfire code. So we replaced the coil pack and that went away for about 150 miles and then a number six cylinder started misfiring. We noticed that the number 6 spark plug cable was broken. So we replaced all cables and plugs. And now we have number 4 cylinder misfire. We checked the new plug and cable for both and they look fine but we are still getting the misfire. does anyone have any suggestions as to why this may be happening are tips on where to go next?

It's a 2008 with about 135,000 miles.
 
Did you use OEM parts on the ones you replaced, The Jeep is real picky on what gets installed on it.
 
The NGK brand should be fine, I'd check some other simpler fixes. Try some sea-foam, doesn't cost much so you're not out much if it doesn't help. I'd also check fuel injectors, shouldn't be too hard either.
 
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Reactions: Chris
Have you done a compression test and leak down test just to rule out a potentially cracked cylinder head? Not common, but worth ruling out at least.
 
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