Quote:
Originally Posted by 2aircooled
It sounds like you have a 911SC distributor with two vacuum unit ports installed in your car, it is used on engine types 930.07/08/16/17 according to the USA_911_78-83 PET.
It is my understanding that the vacuum unit on distributors for 911SC ROW engines only have one port for vacuum advance... There may be exceptions of course, so others can correct me if I am wrong... The distributor for the 81' 930/10 engine in my car has one port for vacuum advance.
Pulling the vacuum line off the 089 WUR (temporarily to test only) should lower the control pressure and change the AFR (assuming that the 089 WUR is functioning correctly), whether it smooths out the engine or not depends on how the mixture is set.
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I was thinking of doing this, however I was afraid I'd send the mixture to lean and perhaps cause harm to the engine. I suppose I could do it as a quick test just to see if I get some more smoothness under the conditions that cause the rough running. I will attempt this later today and report back.