Quote:
Originally Posted by JFP in PA
A failing AOS diverts vacuum to where it should not be; try pulling the oil fill cap while at an idle, if it comes off very hard (or not at all) the AOS is toast. We made a test fixture from a brand new oil cap and a vacuum gage that reads 0-20 inches of water; a good AOS should read about 5 inches of water, any higher than that and it needs to be replaced.
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Oil fill cap comes off easily and the vacuum is very mild, i can hardly feel it when i put my hand over then oil filler tube but I have been getting more smoke at start up lately. Today it was a pretty thick, whitish blue smoke.
So a failing AOS will create a vacuum leak?