924Board.org

LuckXIII · Joined: 02 Aug 2010 Posts: 6 Location: missouri, USA

So here is my issue. When my car is at idle or in neutral going down the road and I turn the AC on it drops to like 500 or 600 rpm's and runs rough....But runs great with the AC on while accelerating or feathering the gas while stopped. I changed the Idle control valve, and had the AC system checked STILL does it.....PLEASE HELP
_________________
1988 Porsche 924-S

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

First, follow THIS PROCEDURE to ensure your idle is properly set.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

John_AZ · Posted: Thu Aug 05, 2010 4:54 am Post subject:

You changed the ICV.
Did you remove the intake to get it out?

Did you just pull on the ICV to get it out of the hoses? Are the hoses cracked?
Check the ICV hose connection at the intake air boot. Replace all pinch clamps.

If the procedure Rasta suggested does not help, you can get a throttle body rebuild kit from www.arnnworx.com for about $25 shipped.

GL
John

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

Just rip the system out. Its a sports car and you have a big silly sunroof... just kidding.

LuckXIII · Joined: 02 Aug 2010 Posts: 6 Location: missouri, USA

I took the intake off....Replaced the ICV valve, hoses, clamps, gaskets, etc...
maybe what ever tells the ICV valve to come on?? I really don't know what else to do....I'll check my Idle to make sure, but it idles and runs great other than the issue ive posted
_________________
1988 Porsche 924-S

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

"Idles great" doesn't mean much with this system. . .if the idle bypass isn't adjusted within spec (as above) the IAC may not work.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

LuckXIII · Joined: 02 Aug 2010 Posts: 6 Location: missouri, USA

Thanks I will follow that procedure tonight and see where it gets me....
_________________
1988 Porsche 924-S