Interesting vacuum gauge readings on my 2.2 TBI..

[flatlander757]

So I just got a new Matco vacuum gauge and decided to monkey around with it on my car before I stuff it into my box at work.

I connected the hose to the cylinder-looking thing directly above the brake booster vacuum check valve.

It measured a steady vacuum of about 18.5 to 20 in-Hg

The needle slowly wavers back and forth between 18.5 and 20. It takes about 1 to 1.5 seconds to go from 18.5 to 20 and about the same from 20 to 18.5.

I've been reading and learning a lot about what vacuum gauges can tell you and I couldn't really find my symptom described anywhere. The needle doesn't shoot back and forth rapidly so it's not a sticky valve or burned valve or anything like that.

I just replaced the spark plugs and wires.(Champion RN12YC and "Xact" brand wires... I know they aren't the best wires but will do for now).

I'm thinking it is a really small intake manifold leak. Are there any areas that like to leak with age? Or any hoses or vacuum lines that I should look for?

[mpgmike]

Personally I think that there is nothing wrong with your engine. I'm guessing that you tapped into the vacuum for the brake booster on the protected (other side of the check valve) side and if anything, you might have a bad booster.

Mike

[flatlander757]

Hmmm, thanks for the input.

I'll try tapping into another source later today and post my findings.