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Registered
Join Date: Feb 2000
Location: Monroe, Louisiana
Posts: 1,340
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Warm up Regulator or Auxilary Air Valve
What is the best way to decide which of these two are giving problems.How do you test each without removing them from the car? I am getting a low idle during warm up and getting minor backfires during warm up.Once it is up to temp all is fine. This one has me stumped.This is an 83SC, new injector boots and wires and plugs, new injectors,new rubber everywhere and this just started and the new stuff was put on abut 50,000 miles ago.I have replaced the WUR about three years ago and as for as I can tell I have the origional AAV.I read in the archives about looking for a half moon in the AAV.What next ?
Thanks. Chuck |
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03-31-2003, 11:49 AM
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Crotchety Old Bastard
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The AAV is easy to test. Remove it from the car and put it in the freezer. After 15 minutes or so the slide valve should be open. At room temp it should slowly close back up as it warms.
The AAV increases the idle during cold starts. It will never decrease the idle to less than the set speed. If you completely remove the unit and block off the hoses the car will still start and run due to the rich mixture of the WUR. Try both of these methods and see what you find.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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03-31-2003, 03:35 PM
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Registered
Join Date: Nov 2002
Location: venice ca
Posts: 928
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low idle during warm up usually means a closed AAV.
just put in a new one, its not that expensive
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Jason 81 SC 97 328is 87 Jeep Comanche (RIP) |
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03-31-2003, 04:27 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
