Low RPMS vary - what's up? [Archive] - GrandAmGT.com Forum

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glenng
03-07-2006, 09:58 PM
Hi GA folks, I have a 2003 SE1 V6. Only mods are Dr Speed CAI Stg-3 and a Magnaflow muffler and resonator. At low RPM's say between 1300-1700 cruising at say 50 mph, the rpm's jump around maybe by 100-150 until up to 1800 and above and then it is pretty stable. It doesn't seem this is doing the car any harm - it just sounds weird. Just did the spark plugs and new wires (it occured before this), and other than this car runs great. No SES codes. Gas mileage still good. Did search feature - did not find anything relevent (though I'm sure there is somewhere) - but did see some fixes for idle instability - cleaning MAF, exhaust sensor. Any suggestions? Car has 62,000 miles - bought with 16,000 and has been great!!

Metallman56
03-08-2006, 06:37 AM
well this happend to my car but not when it was over about 1000 rpms. my mechanic, who rocks and is about the only other person in the town i trust with my car, said that the pcm was "searching" for an rmp. i dont remember too much else but he fixed it. sorry not to have no details it was like 2 or 3 years ago so i dont really remember. sorry man thats about the best i can do.

nascarnate326
03-08-2006, 06:40 AM
At 55mph my car is at 1700 rmp's. I guess I have a problem too.