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  #1  
Old 06-13-2001, 02:45 PM
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I have a W126/91 300SE. The economy/vacuum gauge is about 1/4 swing from max economy/vacuum at idle. It swings out a little more if the AC compressor is on. I can cruise on the freeway with a higher economy/vacuum reading. Does this mean anything?

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91 300SE
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Old 06-13-2001, 03:02 PM
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Mine is the same as yours. I think this is normal.
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Old 06-13-2001, 04:10 PM
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In my 1991 420SEL with 192K miles, the economy gauge rests comfortably all the way over to the left at idle. It moves slightly to the right when the A/C compressor is on. When I was having problems with the idle (sticky exhaust valve) the needle regularly moved one-quarter of an inch to the right during idle. Since the idle problem was fixed and the valve adjusted, the needle stays to the left. I don't know if this is true for all M-Bs or whether your model is a little different from the V8s. The fact that you can get a better reading at highway speed may be relevant, however.
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Old 06-13-2001, 05:17 PM
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I have a '88 190E and was having the same problem. My culprit was a leak in the vaccuum line. Hope this helps. Seems like an easier problem to fix than the other.

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