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Do I have a bad transmission modulator?
(I have been posting on another thread, but it is getting a little long).
Symptoms- moderately hard to neck breaking shifts at all speeds, at all temps, in a 300SDL 87 - 126 with OM603. I have been monitoring the vacuum line pressure on the line that goes to the transmission modulator and have observed the following: - idle parked is 14psi - idle at highway speed (on a big downhill) is "usually" 14psi - full throttle is around 5 or less psi - pressure varies proportional to pedal pressure from 14 to +/- 5 psi All that seems fine. Here is the problem. 50% of the time when on city streets, when I accelerate and get the vacuum below 10psi, the pressure will not return, and often leaks off and hovers around 4psi. I get terrible shifts at this point. However, if I pump the mightly vac to get the vacuum back to 10psi or so, the needle will usually recover its freedom of motion and will "work like it should" - that is, varying between 14 and 4 psi. The shifts at this point are absolutely perfect. There are no leaks in my vacuum lines or connectors. The modulator will hold a 15psi vacuum applied directly to it. Does it sound like my modulator is toast? Any help appreciated. thanks
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84 300TD - 235k - Farbe "Surfblau" bought at 213k 87 300SDL - 131k - Farbe "PimpGold" bought at 115k 00 Klepper Faltboot Expedition Double |
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