Mechanics

THE RPM HIGH EVEN ON PARK/NEUTRAL

2004 Chevrolet Optra • 174,000 miles

Hi. I'm driving 2004 Optra 1.8LT Automatic. Last time I'm having the problem with fluctuated RPM during cold engine. So I brought the car to the workshop and they clean-up my throttle body (disconnect all parts related including IAC, all socket and tube) and the problem been solved

But I'm having new problem day after that. For the past 7 years, my RPM only at 800 rpm at all conditions (either when I put on gear parking/neutral or stop at traffic light and change it to neutral). But currently, the RPM high up to 2000 rpm during parking/neutral, especially when I change my gear to neutral while engines running/waiting at traffic light, or waiting my sons at his school.

How to solve it? I want it back as before, at 800 RPM. Idle Air Control Valve problem? Throttle position sensor problem?
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Rosszaister
December 29, 2011.




Start by cleaning out the IACV and see what happens

Tiny
Rasmataz
Dec 29, 2011.
Thank you. Will do as per advice.

Tiny
Rosszaister
Dec 29, 2011.
No CEL?

Tiny
Fixitmr
Dec 29, 2011.
May need computer re program of throttle functions.
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Tiny
Fixitmr
Dec 29, 2011.

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