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Old 11-08-2008, 08:34 PM   #4 (permalink)
amateur mech. engineer
Join Date: May 2008
Location: New York City
Posts: 112

Sporty Accord - '88 Honda Accord LX-i
90 day: 23.25 mpg (US)

Dad's Camry - '01 Toyota Camry CE
90 day: 22.81 mpg (US)

Artie's Camry - '98 Toyota Camry
90 day: 37.3 mpg (US)
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It's possible that you have a leaking valve, incorrect valve clearance or a worn camshaft lobe. Does the engine run smoothly?

One way to make the gauge steadier is to put a restriction in it. I did that by putting some wire insulation stripped from a wire into the vacuum hose. It has to fit snugly in the hose. Another possibility is to stick a threaded stud or a bolt with the head removed into the hose. It works best if there is a long length of vacuum hose between the restrictor and the gauge.
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