I test drove an 85 300SD for about 5 miles to experience average performance for all but one case of acceleration from a full stop. The one occurrance accellerated powerfully and with very little pedal. Tried to duplicate, could not.
Questions: How do you know if the turbo is "kicking in" or assisting?
Is is assisting all of the time or does something regulate the boost?
Is the turbo effect even noticible at low speeds?
I'm wondering that the car may be taking off in second gear most of the time.

There is a cable hanging down on the drivers side of the transmissinon that resembles a Delco-remy type side terminal battery connector. It has two wires molded into it that are jumpered out. Does this have any effect on shifting, or is it just a neutral safety switch cable?

Any advise on a good repair manual that explains the various systems functionality? I have seen some CDs on the net, but have had poor luck finding good ones.

Thanks for any expertise offered.
John.