Our Community is 940,000 Strong. Join Us.

1998 Mystique 2.5 P304

04-13-2008, 01:14 PM
I have a 98 Mystique with a 2.5L auto. It seems to have one heck of a misfire to it. I've pulled the codes and one of them was the #4 cylinder misfire. I've done the plugs and wires and also the upper intake gaskets. But it doesn't seem to help. The plug on the #4 cylinder keeps fouling up. I only have to run it for about a 30 minutes before the plug is completly fouled, which is probably causing the misfire. I ran the engine with the plug removed from number 4. There is only a little oil on the plug, but it almost smelled like exhaust fumes coming from the cylinder. Does anyone have any ideas as to what is going on with my car?

05-10-2008, 05:39 PM
A couple things come to mind...

Injector harness is cracked and fuel injector is running full duty. 95-98 had problems with wiring harnesses cracking.

Coil pack is bad.

My guess is the first option.

Add your comment to this topic!