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Old 06-30-2008, 01:32 AM   #7 (permalink)
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Join Date: Dec 2007
Location: Southern California
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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90 day: 40.49 mpg (US)
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azlar -

Originally Posted by azlar View Post

If you're getting 10 inches of mercury, either your engine is sick, or it's a bad vacuum source. Should be getting 15-18 at idle.

Is the needle steady? Does it bounce up and down, or slowly fluctuate? This gauge is a great indicator of both engine health and economy. Check a service manual or on-line reference for details about the readings.

The boost side is a waste of money, unless you have a turbocharger. Not a popular ecomod option...

I've run that gauge for 20 years and it's about the best fuel efficiency meter there is (for ICE).
Thanks for the info. The needle is rock-steady so I am hoping it's a bad source. I'll do some homework and see what's up.


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