TrueJeep565
New member
Hey guys I am having trouble with my 2008 jk. It has 120k miles on it and is throwing a PO304 code. Since figuring out the code I have replaced spark plug wires to all cylinders and replaced the spark plug to that cylinder (previous plugs had about 20k on them).
I'm thinking bad coil? But have noticed knock on startup (cold here in SD) which continues for about 5 minutes. Also just had manifold on drivers side replaced along with an injector cleaning service from dealership.
Any ideas? Thanks in advance.
I'm thinking bad coil? But have noticed knock on startup (cold here in SD) which continues for about 5 minutes. Also just had manifold on drivers side replaced along with an injector cleaning service from dealership.
Any ideas? Thanks in advance.