Weird new quirk. From a stop, my vehicle shifts through all four gears before I even hit 20MPH. Engine idle doesn't change, just a series of annoying klunks.

I've been manually shifting it since this started. Works fine.

On further inspection I noticed that my vac line to the transmission has been cracked for quite some time, possibly since I've owned the vehicle. But connecting it would be useless, my "Master" modulator on the IP is broken.

Need - stick - now.

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Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel

Vacuum has nothing to do with shift timing, check your bowden cable.

Yep, when I bought my 82 the bowden cable was on the wrong side of the throttle linkage. Shifted exactly how yours does, made for some good negotiating room though. "Seems the transmission is on it's last legs..."

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<insert>clever statement</insert>

I'll give the bowden an inspection then.


Next: so what does the vacuum control then?

__________________
Vehicles:
2002 SLK 230
Gone but not forgotten:
1983 300D
1981 El Camino 'OILBRNR' - 6.2L diesel
OM617 powered '86 F150
1984 BMW 524td
2001 VW Beetle TDI
1994 Sunurban 4x4 6.5L diesel

Shift firmness.