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Idle speed increasing

Tiny
YOGESHKOSHTI
  • MEMBER
  • 2004 CHEVROLET OPTRA
Hello,

I have purchased a 2nd hand chevy optra 2004, it is running fine but sometimes when I turn on AC the RPM raises too high (3500RPM) and won't come to normal position, even I turn off the AC still the idling is too high.I don't know how to set the RPM of it.
It is creating a problem for me while going for a drive.
Can you please suggest me how to set the idle time for my car?

Thanks in Advance!
Yogesh
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Monday, June 14th, 2010 AT 12:29 AM

12 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

I would service the throttle body. I have attached two pictures and a tutorial for you to view. Hope this helps and thanks for using 2CarPros.

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/engine-idles-too-high

Please run down these guides and report back.

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Saturday, September 29th, 2018 AT 8:47 PM
Tiny
JUDDYZAD23
  • MEMBER
  • 3 POSTS
Only this throttle body if I turn the AC comes to low 400 rpm if turn off the AC comes to normal 800 to 900.
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Saturday, September 29th, 2018 AT 9:54 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Is this what the throttle body on your car looks like? What size is the engine?
Danny-
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Saturday, September 29th, 2018 AT 10:10 PM
Tiny
JUDDYZAD23
  • MEMBER
  • 3 POSTS
1.6 Chevrolet Optra 2004.
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Saturday, September 29th, 2018 AT 10:25 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

I have attached a picture of what the Idle Air Control Valve looks like. Do you see this located on your throttle body? I have also attached a relearn procedure. Hope this helps and thanks again for using 2CarPros.
Danny-
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Sunday, September 30th, 2018 AT 1:44 AM
Tiny
JUDDYZAD23
  • MEMBER
  • 3 POSTS
Thanks for advice worked perfect!
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Sunday, September 30th, 2018 AT 2:48 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
You are welcome!
Thanks for using 2CarPros.
Danny
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Sunday, September 30th, 2018 AT 4:26 AM
Tiny
ROSSZAISTER
  • MEMBER
  • 2 POSTS
  • 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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Thursday, March 14th, 2019 AT 10:36 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Start by cleaning out the IACV and see what happens
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Thursday, March 14th, 2019 AT 10:36 AM (Merged)
Tiny
ROSSZAISTER
  • MEMBER
  • 2 POSTS
Thank you. Will do as per advice.
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Thursday, March 14th, 2019 AT 10:36 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
No CEL?
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Thursday, March 14th, 2019 AT 10:36 AM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
May need computer re program of throttle functions.
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Thursday, March 14th, 2019 AT 10:36 AM (Merged)

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