2001 Jeep Cherokee 6 cyl. "Engine" light comes on & stays on until code cleared. Shows #4 misfire.Have had new plugs, valve cover gasket, fuel injector cleaning. Runs fine, not rough. Any ideas?
by 
Ron
ANSWERS: 2
-
Unhook the spark plug wire on the #4 plug. Get a spark plug socket and tighten the plug. I had this problem before and it turned out the plug wasn't tightened enough. With the vibrations of the engine it came loose. I could actually remove it with my fingers without any turning. Anyways...this should fix the problem. If not, then you will want to replace the plug itself (if you do one you should do them all). If THAT doesn't fix it then you'll need to look at the coil pack (however this usually causes multiple misfires). Hopefully it's just a loose plug... Good luck, Hope this helps
-
Check out the exhaust manifold. I have the same problem in my 2000 and after the fiel pump was replaced 2, they then loooked at the manifold. the way it is designed, carbon build up and debris gets trapt at the 3 and 4 cylinders. Just like you the light was comming on all the time. After the Exhaust valve was fixed the problem went away. But now they want to replace my engine head to totaly fix it. hope this will hepl.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC