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Old 05-25-2003, 12:29 AM
JSlabotsky JSlabotsky is offline
Registered User
Join Date: Dec 2002
Location: Piedmont, OK
Posts: 69
Hey MBRookie, I wanted to clear up a small thing. . .

That "Economy" gauge is completely useless and doesn't say anything meaningful in diagnosing problems (unless you have one hell of a bad vacuum leak).

The gauge isn't telling you how much fuel is being sent to the engine, it just measures engine vacuum. When you open the throttle, there's less engine vacuum and the needle goes up. When you let off, the engine is sucking air through a smaller opening, creating more vacuum, and the needle goes down.

Think of it as the mechanical equivalent of your wife complaining about your lead foot.
1998 S320
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