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TDIDog's Avatar
 
Join Date: Aug 2010
Location: Comox B.C.
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Low Idle on cold start up

I'm looking for assistance on what to look for. On cold start idles quite low. Once it warms up, idles fine. I'm assuming there should be a fast idle on start up.
Thanks for all input. Oh, its an 86 930.
Cheers
jack

Old 07-12-2011, 09:00 PM
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Turbofrog
 
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Join Date: Aug 2009
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The gismo AAV(?) next to WUR should feed air by the throttle plate when engine cold. So check that it's not stuck closed. You can remove the hose from it to get a view.
Old 07-12-2011, 10:12 PM
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Turbo Hooligan
 
Join Date: Sep 2007
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It's a common practice to put a slug in the hose going into the AAR, most of the time when they fail they stick open causing a 2-2.5k idle when warm. with the slug in place you have to apply a bit of throttle when cold, but everything is perfect when warm.
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Old 07-13-2011, 06:02 AM
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I had the same issue in my 87. The solution was to press in the larger of the two discs on the end of the AAR about 1/8". This opens up the slide for a bit more air when cold. You'll want to pull the hose and look inside first. If you don't see about a 1/4" gap when dead cold, this could be your issue. Also recheck the slider when it's hot to confirm that it closes all the way or you may have to push back on the smaller disc. Took me a couple of tries to find the sweet spot.
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Old 07-13-2011, 06:07 AM
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Did you use a small c-clamp and something like an 8mm 1/4" socket as a drift to push in the disc(s)?

My '87 desn't need any adjustment but I looked at it and
I see a steel insert or disc about 10mm in diameter out near the end of the aluminum casting on one side and a large phillips head screw on the other side.


They changed mounting position of the WUR over the years and the angle it's mounted on an '87 the disc is out on the end of the top side of the casting protrusion that sticks out and houses the bimetalic spring and heater element and the large phillips head screw is on the bottom opposite it.

Is your's like that? I don't see a small disc.

Old 07-13-2011, 07:31 AM
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