Quote:
Originally Posted by mitch_04
If a vehicle isn't igniting a cylinder, it will cause a false lean reading. Basically, it sees all the unburnt oxygen and assumes its lean. Since an oxygen sensor doesn't sense fuel, it doesn't realize there is a lot of unburnt fuel as well, it just sniffs all the unburnt oxygen and says "It's lean, add fuel!".
Just another thing to keep in mind, it might something else.
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Bingo! That was the issue! What we found was all 8 injectors were firing, but only the passenger side coils were firing; meaning the driver side coils (where the O2 sensor is located on the driver side) were NOT firing. So raw fuel and unburnt O2...
The wiring guy (not the guy who originally wired in my harness) grabbed the harness bundle behind the intake and gave it a shake. All of a sudden the engine started running properly...
At this point, given all the electrical issues (all in the harness!) I've been having, we decided to redo the harness with a brand new one.
I'm not very happy with the original engine installation guy... his harness sucks.
Oh well - live and learn!
Thank you, Mitch. You hit the nail on the head.