Irratic Revving

[skids]

I have an 87 911 and every once in a while when I come to stop and the car is idling it keeps revving up and down for a while then settles back down. I'm thinking its the idle control valve, but is there anything else I should consider before a buy the valve?
Thanks,

[wolf76]

You can try and clean the valve before you replace it. I have heard it has worked for a few people here.Hope that hlps.

Chris

[wildcat077]

Skids,

I'm having the same issue with my 89...
I removed the ICV valve and cleaned it with brake cleaner and blew some air through it,although it didn't help any.
Check your vaccuum hoses,the clamps become loose over time !

Cheers !
Phil

[skids]

I tried cleaning it a few weeks ago as well and it didn't work for me a as well. I'll check for any leaks.

Thanks guys,

[twistoffat]

Propane or Carb cleaner can help speed up the process of temporarily sealing the leak to allow location.

[kidrock]

do a search on the thread called "idle bounce"...extremely informative.

[john walker's workshop]

too high idle speed will do it. also, listen for the clicking from the micro-switch on the left side of the throttle housing when you manually open and close the throttle. the switch tells the computer to activate the ISV when the closed throttle hits the switch.