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Old 07-02-2012, 02:59 PM
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79Mercy 79Mercy is offline
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Join Date: Mar 2008
Location: Florida
Posts: 4,131
The idle should speed up when the compressor is turned on, my M110 does at least. Check the vacuum line from the distributor to the electric switch over valve. No sure where that valve is on a R107 but on the W123 its on the drivers fender well. That switch should have constant vacuum from the intake at it and when the compressor turns on it should activate that switch to send vacuum to the advance part of the distributor to raise the idle speed.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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