Hey guys, my CEL is throwing 0201 (coil), 0604 (cylinder #5) and 0304 (KS). The cylinder #5 fuel injector was just replaced about 3k miles ago so I assume that it is working ok. So I replaced the coil and the cylinder is still not firing. I've since moved coils around to make sure that the new coil wasn't bad and no matter what I do, cylinder 5 won't fire. If the injector is good (assuming) and I have a known good coil, what could cause this cylinder misfire?

FWIW, this is the first time that I've gotten 0201 and 0304. Over the past 6 months I have been replacing coils and injectors and the CEL light has indicated cylinder misfires on almost every cylinder.

Thanks!

 

have u checked the spark plug.....if u had a injector problem chances are the plug got messed up too...either too much fuel or little fuel and now its toast

 

check to see if the connecotrs and not bad on the injector.. go to autozone and buy a "noid light" is a led bulb that u inser into the plug it will light up when it gets a signal.. that will give you a start on if the wiring is bad of just the parts....

 

Well, I am still stumped. I moved the suspect coil around and didn't see any improvement which told me that it was either the spark plug or the injector on cylinder 5, but not the coil. So, I pull the spark plug and it looked ok but I decided to swap cylinder 5's coil and plug with cylinder 2. The car definitely didn't run any better and I noticed that when the car was idling I could unplug coil 2 without any change in RPM. So, I replaced the spark plug in cylinder 2 (was cylinder 5's old plug) and no change.

So, I am stumped. The coil seems good, the plugs are good, the only thing that I can't verify is that injector 5 is good and I can't tell what's up with cylinder 2 now.

I'm trying to track down a noid light right now.