Vacuum advance hoses correct? - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 07-19-2005, 08:36 AM Thread Starter
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Date registered: Jun 2005
Vehicle: 72 250 M130 W114
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Vacuum advance hoses correct?


I'm wondering if the vacuum advance is plugged in correctly.

What is of the vacuum advance mechanism is supposed to have a constant
vacuum? is idle speed supposed to drop when disconnected at idle?


72 250 w114
ggenovez is offline  
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post #2 of 2 (permalink) Old 11-16-2005, 05:55 PM
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RE: Vacuum advance hoses correct?

Yes, generally idle rpm drops when the vacuum advance is disconnected. That is why one should always disconnect the vacuum tube when setting timing from distributor adjustment. The vacuum is not a constant, but changes according to throttle, speed, load. I believe this is a correct summation, but somebody please correct me if I'm wrong.
On where the hose goes, I'm not familiar with your car, but generally the vacuum connection is on the intake manifold, so look for an unused nipple there.
The rpm decrease at idle with the distributor vacuum line removed, especially at the connection is the source of the vacuum, because that "hole" where the vacuum tube enters manifold serves to drop vacuum.
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