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Old 11-24-2002, 09:17 PM
suginami suginami is offline
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
The computer controls your idle by adjusting the ratio of fuel and air based on a large numbers of parameters, i.e. engine load, temperature, altitude, etc.

Having a vacuum leak screws up the whole system because it introduces "false air". Note the following thread and the comments by Stevebfl:

Reving 300 E at idle?
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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