Re: Help! P0304 cylinder 4 misfire
I have a 2002 Jeep with a similar problem. It had a small ticking sound on the driver's side of the engine and would cut out when I went to pass someone or accellerate at a fast rate. If I backed off and gradually accellerated, it would do just fine. I used fuel additives in it and it seemed to be running smoother, but the fast accelleration in gear still produced this problem. Last night I went for a ride and about 20 minutes into the ride, I came up on a stop sign and from that point on, it acted like one of the cylinders was misfiring constantly. I got home and shut it off and refired it with the hood up and it was still there. This morning, i went out and restarted the engine and the misfire seems to have gone away. I had it checke dthe other day and the codes showed an intermittent misfire on the #3 and 4 cylinders. I drove it on a 120 round trip and got a little over 14 mpg, which was up from about 11 mpg before I had added the fuel treatment. I feel it is probably either an injector problem or maybe old fuel (The car sat for about 6 months and had 1/4 tank of gas in it) I filled the tank right after getting it and added fuel treatment. I was gonna try adding a injector cleaner to the gas to see if that was the problem. Any other suggestions?