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Originally Posted by Jmana
My 300SD always slammed into gear, and I always suspected that there was an internal problem too, especially considering it has over 300k miles. Anyway, I drove it like that for several months, then one day I was trying to get the center vent to work, and realized that the pod was shot. Not wanting to bother with the pod, I took it apart so it was always open, and plugged up the tube. After driving it I was shocked that it now shifted like butter, and the shift points were right where they are supposed to be! With as many Benz's with bad pods out there, I would say that be the first place a person should look when they have a rough shifting tranny.
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Jmana - how did you plug that line? Did you do it at the point where the vac line runs from behind the CCU to the center vents?
I'm having this same exact problem you had. The leak is definitely in the climate control system and the center vents are a good bet, though I'm not positive yet. Ever since I figured out where the leak is I've been turning defrost on right before I shift because this makes it smooth.
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Originally Posted by Samuel M. Ross
...Be patient now guys [and any gals out there] for what I believe I have found is that understanding how to properly use these restricted orifices is absolutely KEY to getting the external vacuum components/system properly balanced and functioning. This external system must pass onto the modulator a variable vacuum that decreases from ~15 inches of vacuum down to or near “zero” as you drive and put the petal-to-the-metal! Yes, the mail reason I am brow-beating you with this is that I want to REALLY emphasize that you MUST get this part right before you start adjusting the modulator… and my purchase of and having all six of the different colors/sizes of orifices was the best nickel-N-dime investment I made through all of this experience....
Sam
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I noticed on my car, which is a CA car, the vac going to the tranny is 20.5" hg when it seems to be working correctly. I'm not sure if this is the 'proper' number or not, but I suspect the CA models with the blue transducer are different in this respect. As you mentioned, we CA owners have some unique aspects of our cars to puzzle over.
Another great write-up, Sam!