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Originally Posted by 1slowdsm
Hmm...I have one question. Do anyone else here run lean when they start their car after its been sitting for a while. Thats whats my car does all the time, so I have to drive it for a little while and then thats when the A/F gauge starts to move. It also likes to disappear(spelling) past the red for a few seconds when I go into neutral, then it pops back up. Normal Or No?
(my car wouldn't be quick next spring, just quicker than it is now...haha)
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Your car should run rich when first started "cold" and there should be little if any o2 activity for up to a few minutes after starting, since the ECU stays in open loop(no o2 feedback) until warmed up.Once warmed up the o2 feedback kicks in, in which case the A/F gauge will start jumping back and forth.