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ON MY 1992 LT1 CONVERTIBLE, I HAVE A HIGH IDLE (1800).

by DEAN DASSEL
(MACON, GEORGIA)

I HAVE REPLACED TPS, IDLE AIR CONTROL VALVE, CLEANED THROTTLE BODY, CHECKED THE TPS MODULE. EVERYTHING CHECKS OUT FINE. I ALSO HADE THE ECM REBUILT. CHECKED ALL GROUNDS, AND STILL TO NO AVAIL. ANY HELP? I AM GETTING A CCM CODE 41, SO I CANT SEE THE ECM CODES, BUT I CAN VIEW CCM CODES AND ABS CODES, AND AM GETTING NOTHING.

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Nov 04, 2018
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starstarstarstarstar 		Diagnostics NEW
by: Anonymous

Try checking the RPM using a timing light with a built in tach to see if the dash tach is correct. My 1991 always reads 400 RPM higher than actual and this is a problem with a resistor on the tach breaking down. I use my laptop plugged into the OBD I port with analytical software to give me actual data on the systems like the TPS values and the idle air control valve along with real time values on the O2 sensor to get a good snapshot of what is working and what is not. Sometimes a code will just lead you more or less in the direction you need to go and that can cost a lot of money replacing all the parts covered before you find the right one(s).

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