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Old 03-19-2002, 09:56 AM
Mark Herzig's Avatar
Mark Herzig Mark Herzig is offline
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Join Date: Apr 1999
Location: Austin, Texas
Posts: 380
There is quite a bit on this subject if you search for Warmup Regulator or additional air valve.

My understanding is that once the engine is warm, in idle you do not want any additional air introduced into the mix. My 450SL has an thermostatically controlled air slide that shuts off once the engine temp reaches a certain temperature. If the valve does not completely shut, then the additional air causes the engine to run faster...
Mark Herzig
1995 E300D 153K
1985 300D 142K (sold)
1979 450SL 122 miles (sold)
1992 500E 127K (sold)
1987 300SDL 132K (sold)
1986 300E 161K (sold)
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