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Re: What is the jiggle test? 200 88

posted by  someone claiming to be Don Foster on  Thu Nov 30 14:03 CST 2000 [RELATED]

The so-called "jiggle test" is not as reliable with the lighter plastic cap because it's, well, lighter. So cars that still have enough crankcase vacuum can still display some jiggling. Sometimes a new, soft gasket acts somewhat as a damper, and also seals well enough that the vacuum prevails and the cap doesn't bounce around.

But if you say, "ready to take off like a rocket..." then it sounds serious. You're right to worry about your rear main seal, the three front seals, and also the plug in the back of the head.

Candidates include the flame arrestor, the big hoses, the flame trap housing, the oil separator, and especially the small hose and the brass fitting in the intake manifold.

I've measured the crankcase vacuum at idle on 4 of my Volvos, and all are around 1.5" to 3" (of water). One car had a plugged oil separator and measured about 8" of pressure. Roto-rooting the separator fixed it, and it returned to about 2" of vacuum.



Don Foster (near Cape Cod, MA)





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