Thread: 2001 gagt1
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Old 01-22-2011, 08:13 AM   #12
AaronGTR's Avatar
AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 40
Posts: 12,233
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
Originally Posted by stillriza View Post
Your car runs on a low mileage & consumes too much fuel..when was the last time you replaced the o2 sensor?

The missfire would usually be caused when a bad o2 sensor affects the air/fuel mixture and engine combustion. It's more evident @ idle or running at a very low speed.

Same with the rough idle..O2 sensor plays a significant role in regulating the air/fuel mixture, engine timing and intervals between engine combustion, ther's no doubt a bad oxygen sensor will cause the engine to run rough or irregularly.

Any engine pinging? A bad O2 sensor either retards or advances the engine ignition timing, which will cause engine pinging.

Nope. Actually the O2 sensor has absolutely NOTHING to do with ignition timing. It makes adjustments to air/fuel ratios and that's all. It can cause bad mileage for sure if it's not working properly, and can cause detonation in certain circumstances, but it usually is not the culprit for misfires.
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