AJ_

So my Jeep is back together and after changing almost everything excluding the coil pack, cables, and injectors I am still experiencing rough idling and blinking engine light with p0300 Any ideas?

Jeepstercanada

What year ?

AJ_

2007, I'm beginning to think it may be one or more of the injectors but godddd they are so expensive. How can I see which one is bad?

AJ_

Stuck a long screwdriver to the front injector and its making a clicking noise. That means its bad right? how can I check the other ones that I can't reach?

jedg

A clicking noise means it working.

Jeepstercanada

You change plug wires ? Could be bad coil pack to

AJ_

Update** So my dad has a really good Jeep mechanic friend who I just talked to. Told him all what i replaced: EGR valve, PCV Valve, O2 Sensors, Head gasket and covers, spark plugs, cleaned throttle body, checked injectors, and ran seafoam. Then I told him I was knocking on the catalytic converter to check and see if they were okay and heard a rattle noise in the one to the back on the driver side. He said remove the exhaust and from the exhaust manifold and run it. I did and the engine light is still on (because exhaust is disconnected) but not flashing! The issue has stopped, NO MORE P0300!!