But the o2 sensor detects oxygen not fuel. A cylinder full of unburnt oxygen just went down to the sensor. Yeah there's fuel but o2 sensor doesn't detect fuel. So it would tell the PCM it's lean, PCM would add fuel to compensate creating a rich running car.
I'm with you though, I don't know if a spark plug occasionally not firing would effect anything enough to cause the PCM to make a change.
Someone knows this. Hoping duster, turbo666, or some other internal combustion smarty pants will chime in.
Silver 05 Srt-4 fpgreen s3
07 Charger RT AWD
Last edited by dohc122acr; 09-12-2011 at 02:49 PM.