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Old 06-07-2024, 04:09 PM   #5
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
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Quote:
Originally Posted by S50Sinner View Post
After digging into it again today, I noticed that my manometer is in inches of mercury, and the correct crankcase measurement of 5in-H2O barely registers in it.

I also finally found somewhere to shove it in the plenum and found very steady vacuum around 16 in-Hg. I tried searching, but can't find any info on what the reading should be. A general search showed me that most cars should be steady between 15-22, so things look positive but I'd like more certainty.

If anyone is wondering as I was before, I unscrewed the little blanking plate on the rear of the passenger's side and jammed the manometer adapter in there, it worked like a charm.

Next step, I'll order a fuel filter, as I should replace it regardless of what's causing this issue.
Intake vacuum and sump vacuum are two entirely different things. The AOS in these engines throttle the high intake vacuum down to about 4-5 inches of water in the sump when the AOS is working properly.

If you manometer is digital, you should be able to switch from inches of Hg to inches of water with a click, and then retest the dipstick tube. Again, you can also smoke test the tube as well.

You are too early in the process to claim victory......
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