Black Plugs in Adjacent Cylinders and Vacuum Jitters - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-19-2010, 03:01 PM
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Black Plugs in Adjacent Cylinders and Vacuum Jitters

When taking a vacuum profile for the selection of a PCV (car did not come with a PCV) to reduce crankcase pressure and crank slinger oil seepage, I was surprised to find a vibrating vacuum reading between 7 and 15 inches Hg at idle (900RPM). Since the engine preformed without an indication of any problems, I was not expecting to see this condition.

Upon suggestion that the condition could be the result of tight valves, and since I had re-bushed and adjusted the rockers 3 months earlier, this seemed to have a high possibility. When extracting the plugs in preparation for the adjustment, I found perfect color on all plugs but cylinders, 2 and 3, which were black. Since this is a straight 6, 2 and 3 are adjacent cylinders. While Iím waiting for a friend to return my compression gauge, I would appreciate any suggestions.

All the best,

Ray (Healey64

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Old 08-19-2010, 05:13 PM
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Bad intake or head gaskets?
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