Quote:
Originally Posted by stevebfl
Low modulator pressure will cause that trans to slip. Somewhere between where you are at and slipping is a modulator pressure that gives good shifts. It will not vary from shift to shift so its only usefull for general conditions such as yours.
To do it right modulator pressure should be measured against a standard and if right and shifting is wrong, there is another issue. When testing mod pressure the value is for zero vacuum, but once that is established the value at idle vacuum should also be noted and it should be way different. If vacuum were applied to the modulator with a mitivac while the gauges were measuring mod press, a steady change in pressure should occur between zero and idle vacuum.
These cars will shift much harder if the power (and thus manifold vacuum) is reduced for any reason. Thus a smooth powerfull motor is often part of the cure.
|
Steve,
I am quoting an old thread of yours regarding transmissions. I hope you can advise me.
I just had my transmission re-built and picked it up yesterday. My car is a 1993 300E 2.8
Now the car starts on 1st gear all the time and shifts hard to 2nd. I told the tranny shop about this and the guy insists that this model always starts on 1st. As far as I know, this car starts on 1st only when you press aggressively on the gas pedal to get it to start on 1st. Otherwise, under normal driving conditions, it should start on 2nd. Am I right?
I've been looking for any material about this, but could not find any. I'm still looking, but if you can lead me to the right web site or thread, it will be highly appreciated.
If this starting on 1st is resolved, will it fix the hard shift fromm 1st to 2nd? or will I need to adjust the modulator (or adjust somehting else?)
Thanks for any advise.
Rico