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Old 06-13-2001, 01:45 PM
sixto's Avatar
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Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
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?

91 300SE
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Old 06-13-2001, 02:02 PM
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Join Date: Jun 1999
Posts: 74
Mine is the same as yours. I think this is normal.
89 300SEL
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Old 06-13-2001, 03:10 PM
BENZ-LGB's Avatar
Strong, silent type
Join Date: Apr 2001
Location: Southern California
Posts: 1,663
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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1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

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Old 06-13-2001, 04:17 PM
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Join Date: Apr 2001
Location: Doylestown, PA
Posts: 124
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.

1988 190E 2.3 (178,000)
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