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Join Date: Jul 2007
Location: Davis, CA
Posts: 142
Update.

After hooking the suspect wayward hose back up the hot idle problem seems to be gone and the idle is rock solid at just under 1K. However, now the cold idle is sometimes much higher than it was so I suspect some goofiness from the WUR is also in play. Will try the isolation tricks and see if it helps further.

Thanks to all for the help!

-JWL
Old 10-15-2011, 09:01 PM
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Alan L's Avatar
 
Join Date: Apr 2006
Location: New Zealand
Posts: 3,185
How high? It is supposed to be high(er). Around 12-1300 would be ideal. You have an air auxilary valve (AAV) next to your WUR that also works on a bimetallic finger with heat and when cold allows extra air thru for the extra fuel your cold WUR lets thru. In theory, they work in tandem and heat up together and close the AAV off as the WUR closes up. Then your idle should drop to around 900 rpm. Often, idle problems are due to a sticky/faulty AAV. (easy to check and fix).
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 10-15-2011, 10:36 PM
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Alan is right. Your AAV (or is it really a regulator, thus AAR) is doing as it's supposed to do when cold. Mine idles at around 1400 when stone cold. The only negative thing about them is that after even a few minutes of shutdown on a warmed up engine, you get high idle once again at re-starting 'cause the valve has opened up due to the power having been cut to the heating element with the engine off. Kind of annoying is all.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 10-16-2011, 04:26 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
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