2006 Jeep WK 3.7l
I just changed spark plugs ~2500 miles ago due to a misfire code and yes they were worn fairly bad. Any ideas why it keeps doing this?
Thanks for the reply my first one! All cheering aside yes my jeep shakes pretty bad at an idle. I changed the spark plugs and it stopped and just noticed today had the code read and sure enough it was it. Cylinder 4 this time. It has 137k on the whole thing. Could it have been my cheap nature at the time purchasing cheap plugs?
Chrysler products do NOT like autolites. But if it was doing it before I don't suspect that is the issue. I have seen valve guide issues cause a misfire at idle. That repair is likely going to be a remain cylinder head.
For a misfire you need to test for spark, fuel, and compression. Swap a coil and plug and injector to different cylinders and see if the code follows to one of those. If it stays on cyl 4 then you need to do a leak down test on that cylinder and go from there.