[BMWCSRegistry] idle problems

[SPANLAB]

It seems you have a vacuum leak. Check all your hoses, check valve. 
Do the servo check to see if its working. correctly.
Enrique

>From: jmlaughead at aol.com
>To: BMWCSRegistry at idb.ded.forest.net
>Subject: [BMWCSRegistry] idle problems
>Date: Thu, 12 Jul 2007 10:44:07 -0400
>
>Hi gang.  I've got a 71 2800CS with two Weber 38/38s.  I've been 
>playing with the idle adjustments recently and think I have it set 
>where I want, but now have a new problem.  Under braking (e.g., 
>coming to a stop sign), the idle drops way down (from about 900-1000 
>to about 200rpm) with the A/C off.  After a few seconds at rest, 
>foot still on the brake pedal, it comes back up.  Repeated pressing 
>on the brake pedal while at a stop has little to no effect (it might 
>drop the idle just a little, but not much).
>
>I'm assuming this is either:
>
>1. a vacuum problem (perhaps in the booster?) drawing too much 
>vacuum from the carbs under hard braking and reducing the amount of 
>fuel sucked into the carbs, or
>
>2. Loose motor mounts causing the engine to move on deceleration and 
>tweaking the throttle linkage or otherwise upsetting the carbs.
>
>As I recall, the vacuum advance on the distributor has no affect at 
>idle, so I'm assuming it is not a problem with the lines that go to 
>the distributor.
>
>Anyone have any ideas as to how to diagnose either of these issues, 
>or any other suggestions?  Someone mentioned that there may be some 
>sort of check valve in the brake booster that may need to be replaced.
>
>Thanks,
>Jim
>
>71 2800CS
>74 R75/6
>72 911
>
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