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Old 12-08-2019, 09:27 PM   #2
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alexiskai's Avatar
Join Date: Apr 2018
Location: Mebane NC
Posts: 434
Default Re: Compression test and Vacuum test readings need help

Looking at the following guidelines on this page:

Gauge will indicate loose valve stem guides when gauge pointer pulsates rapidly at idling speed. This rapid pulsation disappears with the increasing speed of the engine.

Gauge will indicate a choked muffler when engine is speeded up several times in succession and the gauge pointer drops slowly. A clear muffler is indicated by a quick drop to zero.
So the drop to 0 seems like it's normal behavior, and the pulsating at idle could indicate loose valve stem guides.
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