So I changed the spark plugs/wires and the cyl 4 fuel injector and the light and code went away for a week, popped back up ( even though there is no actual misfire now ) and it keeps coming on, again there is definitely not a misfire, why is the code still popping up? I know I need to replace the upstream o2 sensor, could that be a problem with changing the fuel injector since the upstream o2 is fuel related?
Misfire Cyl 4
- Thread starter Jamessandlin
- Start date
I had a misfire code for a while. At first it was random, then it was cylinder two after I did a plug, wire and coil change. Ended up the end wasn't on the plug tight enough. Pulled it off, applied more dielectric grease, reinstalled it, no more misfire codes. I also have been running Berryman's B-12 injector cleaner in the tank for quite awhile. It has Acetone, MEK and Methanol in it. Best injector cleaner there is. You might try some just for 
s and giggles. These vehicles are old and injectors do get plugged up. Especially if they've sat for any prolonged period of time.
Try getting the fuel filter changed as well.
s and giggles. These vehicles are old and injectors do get plugged up. Especially if they've sat for any prolonged period of time. Try getting the fuel filter changed as well.
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