Vacuum retard

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T.Hanson
Posts: 1696
Joined: Wed Jul 26, 2006 7:39 am

Vacuum retard

Post by T.Hanson »

'81 528i : the vacuum retard port (tube) under the throttle body is plugged with a red rubber cap. I assume the small tube under the distributor for vacuum retard is left alone, no plug necessary, as it came off without anything there.

What happens if I unplug and put a vacuum tube to the distributor ? The serial numbers matched between old and cleaned versionn but are some distributors made to not vacuum retard ?
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