RPM problems with S-10

MVSOPHIA

MEMBER
1996 CHEVROLET TRUCK
6 CYL
2WD
MANUAL
160,000 MILES

My 1996 S-10 with a 6 has a periodic problem with the RPMs. That is, when I put my foot on the clutch while driving they RPM go up initially before dropping. When I am in gear they also stay up although I have my foot off the clutch or the transmission is in neutral. When I come to a stop the RPMs go down to idle. I have had sensor changed after a scanning but the problem returned.

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

What sensor? What code?

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Tuesday, April 5th, 2011 AT 3:48 PM

MVSOPHIA

MEMBER
2 POSTS

Replaced IAC valve (AC147) with new one. It made a difference for a few days and then the situation returned. Also had the dealership check and do the latest program but didn't find anything. Code 10653. It is quite strange. I had the throw bearing replaced a few months ago and the RPM situation went away but returned. Cheers, Craig

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Wednesday, April 6th, 2011 AT 3:08 PM

MERLIN2021

MECHANIC
17,250 POSTS

I don't have a listing for that code? Codes come in several varieties "P" "B", "U" and "C" followed by four numbers like P0653 but it's not found, A vacuum leak or improper adjustment on the cam sensor are the two likley to upset your idle speed. By using a can of spray throttle body cleaner and spraying the vacuum lines and around the manifold seams, if the idle speed changes you found a leak, also check your EGR to make sure it's not sticking partially open. Check Brake booster hose and check valve.

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Wednesday, April 6th, 2011 AT 8:40 PM