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Old 12-28-2009, 12:49 PM   #2
AaronGTR
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AKA: Aaron
Join Date: Aug 2002
Location: Detroit area, MI
Age: 39
Posts: 12,214
Vehicle: 2000 Grand Am GT1 2dr
AaronGTR has made plenty of valid pointsAaronGTR has made plenty of valid points
If the old MAF was dirty or somehow otherwise damaged, and wasn't cleanable/fixable, then putting a new MAF on could certainly help. Doesn't matter if it was used, as long as it's functioning properly and it's the same part. It might affect your fuel trims and should make the fueling more accurate and improve your mileage a bit, but it shouldn't really affect your idle speed. I know sometimes a dirty MAF can cause a surging or rough idle, but that should be from inaccurate fuel metering at low engine speed. The idle is usually set just by coolant temp (warm or cold start), the TPS sensor, and the IAC valve. If you have a sticky or dirty throttle plate or IAC valve that could be affecting idle speed, or possibly if you need to do a throttle position learn procedure. You'd need someone with a scanner to see what number the pcm is seeing with the throttle closed and open, but you could do the procedure regardless just to make sure it is ready correctly. Not sure what else it might be.
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