Hey guys, thought I would document how I solved a high rpm problem in my 1989 six-speed Corvette in hopes that it may help someone.
Please excuse me as I don't have all the right mechanical terminology, but I changed my fuel pump a few months ago (used stock ACDelco parts) and my car was idling great at about 7-8 rpm's at a stand still. The fuel pump install was a success and it actually increased the acceleration of the car. Anyway, fast forward a couple months (a few days ago) and while driving the rpm's would stay at whatever speed I was at even with my foot off the pedal. For example, on the highway in 5th gear I took my foot off the pedal and the car kept driving at the same speed. My cruise control was off. Same thing with lower gears in the city. My rpm's would stay the same even when I took my foot off the gas pedal. It was only when I tapped the gas pedal quick that it would drop down to the normal idle or speed. It would drop to 10-12 rpm's, which was still higher than the 7-8 rpm's after the fuel pump installation. Long story short, first I unplugged the Idle Air Control Valve (IAC) and sprayed it with electrical cleaner. Plugged that back in and that didn't help. Then I removed the Mass Air Flow Sensor and sprayed it with MAF Cleaner. While that was off and drying, I sprayed the throttlebody (still on the car) with throttle body cleaner. I used a tooth brush and praper towel and cleaned what I could in there. It had a grayish/black film on it. I also LIGHTLY lubed the swivelling parts in the throttle body and all moving parts on the outside associated with the throttle body with Sea Foam Deep Creep. I managed to clean the throttle body fairly well, although not as thorough as I could with it off. I put everything back together and went for a drive. The car drove well. The rpm's went down each time I let off the gas. It also went back to idling at about 7-8 rpm's at a stand still. I was very relieved and THANKFUL that this problem was solved. Hope this helps.
Please excuse me as I don't have all the right mechanical terminology, but I changed my fuel pump a few months ago (used stock ACDelco parts) and my car was idling great at about 7-8 rpm's at a stand still. The fuel pump install was a success and it actually increased the acceleration of the car. Anyway, fast forward a couple months (a few days ago) and while driving the rpm's would stay at whatever speed I was at even with my foot off the pedal. For example, on the highway in 5th gear I took my foot off the pedal and the car kept driving at the same speed. My cruise control was off. Same thing with lower gears in the city. My rpm's would stay the same even when I took my foot off the gas pedal. It was only when I tapped the gas pedal quick that it would drop down to the normal idle or speed. It would drop to 10-12 rpm's, which was still higher than the 7-8 rpm's after the fuel pump installation. Long story short, first I unplugged the Idle Air Control Valve (IAC) and sprayed it with electrical cleaner. Plugged that back in and that didn't help. Then I removed the Mass Air Flow Sensor and sprayed it with MAF Cleaner. While that was off and drying, I sprayed the throttlebody (still on the car) with throttle body cleaner. I used a tooth brush and praper towel and cleaned what I could in there. It had a grayish/black film on it. I also LIGHTLY lubed the swivelling parts in the throttle body and all moving parts on the outside associated with the throttle body with Sea Foam Deep Creep. I managed to clean the throttle body fairly well, although not as thorough as I could with it off. I put everything back together and went for a drive. The car drove well. The rpm's went down each time I let off the gas. It also went back to idling at about 7-8 rpm's at a stand still. I was very relieved and THANKFUL that this problem was solved. Hope this helps.
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