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How to clean idle air control valve

Tiny
BUSHWICK
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 200,000 MILES
How do I clean the idle air control valve and throtle body
Sunday, January 20th, 2013 AT 4:13 PM

16 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have the engine off and use shoke cleaner spray it on both sides of plate an dinto iac hole, car will start hard but it run ok after. Make sure to hook up duct work before starting car.
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Sunday, January 20th, 2013 AT 4:15 PM
Tiny
MAYRAJ
  • MEMBER
  • 1 POST
  • 1999 PONTIAC GRAND AM
I have a 1999 pontiac grand am and my trac off light came on and the check enguin light also came on I bought the IAC, but do not know were it gose can some one help me.
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Monday, November 4th, 2019 AT 12:21 PM (Merged)
Tiny
MBONGERS2
  • MEMBER
  • 8 POSTS
It depends on the motor but if it is the 2.4 it is up front by the black box going to the air filter. If not the 2.4 follow the pipe from the air filter to where it goes into the engine. That is the throttle body the IAC shold be mounted to it. Hope this helps.
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Monday, November 4th, 2019 AT 12:21 PM (Merged)
Tiny
BRIANGIGLIONE
  • MEMBER
  • 4 POSTS
  • 1999 PONTIAC GRAND AM
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 85,000 MILES
What kind of tool is needed to adjust the base idle speed and is the adjustment done from the top or bottom of the adjustment screw?

Thank you in advance.

Brian
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
That adjustment screw never needs to be adjusted. What are the problems you are having? Most idle concerns are caused by a idle air control valve issue
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
BRIANGIGLIONE
  • MEMBER
  • 4 POSTS
The problem is a slight shake felt on the steering wheel at idle speed with the transmission in "Drive" mode. An increase of 100 - 150 RPM removes the slight shake. The idle speed is now at 350 - 450 RPM in this condition. Raising it to 450 - 500 removes the shake. The screw top looks like an allen head but there is a center steel piece preventing an allen from adjusting it. Thank you again in advance.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
The idle is automatically controlled by the computer, what I think you are feeling is a grounded out engine mount. Very common. This engine mount is at the rear of the engine on passengers side. I replace them all the time for a vibration at idle in drive.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
BRIANGIGLIONE
  • MEMBER
  • 4 POSTS
There are three mounts. Two on the transaxle front and rear, I replaced the front and inspected the rear, and one on the engine on the p/s upper mid section which I inspected also and is in good shape. When I manually hold the rpm up 100 - 150 rpm, the vibration is gone. I have manually shimmed the throttle cable to keep this rpm and test ran the car and all was great. I could drill out the idle stop tha's in there if it's not adjustable and top in an adjusting screw. Wha do you think? Thank you again in advance.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
The one on the pass side upper mid section is the one in question. Humor me. Have it in drive in idle and try using a pry bar to move engine so the pressure is off this mount and tell me if the vibration goes away because I bet it does.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
BRIANGIGLIONE
  • MEMBER
  • 4 POSTS
I will try that tomorrow or wed and let you know. Thank you.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
KMANIT
  • MEMBER
  • 5 POSTS
1999-2005 Pontiac Grand Am has a screw to adjust idle speed. It is located on bottom side of the throttle body, and easiest to adjust if the throttle body is taken off. Has hex head, tighten to increase idle and loosen to reduce idle speed. I feel turning around 1.25 is good adjustment to test.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
SOTTJOEY0069
  • MEMBER
  • 2 POSTS
  • 1993 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 160,000 MILES
I just needed to know what the name of the part that is connected with the tps and the idle air control sensor? It is a sensor part that is metal and is behind the tps and the idle air control sensor. if you can please hepl me out i would appreciate it


https://www.2carpros.com/forum/automotive_pictures/486350_engine_part_024_1.jpg

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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If it has any connection to the exhaust, egr valve? I did look at a partsbook. Didn't see anything that looked like that?
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
SOTTJOEY0069
  • MEMBER
  • 2 POSTS
It does look like it is connected to the exaust in some way and connected with the tps. It is not the map sensor. I looked online and thats not it.
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Monday, November 4th, 2019 AT 12:22 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
My info shows this for digital egr. The one wiring diagram I looked at, didn't show wiring for the egr, maybe I missed it?


https://www.2carpros.com/forum/automotive_pictures/170934_digital_egr_2.jpg

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Monday, November 4th, 2019 AT 12:22 PM (Merged)

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