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45 Posts
Hello everyone I’ve been having an on going problem with a cylinder 4 misfire. I’ll start from the top, in the beginning all four cylinders were misfiring, so I changed out all the spark plugs coil packs and cleaned the throttle body out along with the components connected to the throttle body( IACV, etc) I also ran Seafoam through the gas tank and have been putting 91 octane gas in it since I got the car. After that clylinder 1,2, and 3 stop misfiring but cylinder 4 misfire still came on the cel light. So I decided to change the fuel injectors, cel light went off for the day came back on the next day. Then I decided to change the pcv and check for vacuum leaks using carb cleaner, I sprayed all the lines and hoses. Couldn’t find any leaks and cel light is still on. The misfire only happens when I’m at a still idle, it runs rough, some days better than others, when I’m driving I don’t notice any misfire what so ever! I’m about exhausted any idea of what it could be, any thoughts or comments would be a huge help! I appreciate it, have a good one!