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Compression test, plugs in or out 700 1986

posted by  Don Foster on  Sun Feb 17 08:23 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
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"...should I leave the spark plugs in the block when turning over the engine..."

No. All plugs out.

If you find one cylinder noticeably lower than the other three, squirt some oil in that hole, crank for ~10 seconds (to distribute the oil) and re-measure the compression. If it comes up then it means the compression rings are worn. If it stays low, then it means a valve is bad -- it's usually the exhaust valve, though not always.

"...readings done with plugs removed was higher than in..."

The engine cranks faster.
--
Don Foster (near Cape Cod, MA)






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New Compression test, plugs in or out [700][1986]
posted by  v diddy  on Sun Feb 17 07:50 CST 2002 >


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