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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
I've never experienced this in my '87 but 2 of my local mechanic friends that have worked on porsches for a living for 20-30 years have experinced it.
Sounds scarey.

They said it is caused by the deceleration valve in the early cars. Maybe it was a defective deceleration valve they were talking about, I don't know.

It is the large gold cad plated vacuum limiter that bypasses air around the throttle body and it's opened by intake manifold vacuum during deceleration.

Removing it makes the car more pleasent to drive.
Old 11-23-2008, 08:14 PM
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