W126

1983 300SD vacuum leaks & other issues

1983 300sd trans hard shift from 1st to 2nd then it skip shifts into 3rd and shifts into 4th too early.... slow loss of vacuum when checking underhood line going to ignition switch... also air not blowing from center vents, and sometimes it takes a while til heater blows hot even if it is warmed up..... i replaced green dashpot and have a new trans modulater valve but want to make sure its all correct before i install the modulator because it looks like its been replaced recently (green) thanx in advanced! also do u hacea vacuum diagram for the doorlocks/vacuum pump in trunk....

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83 300sd VACUUM?

symptoms include.... door locks dont work.... well sometimes i come out and some doors are locked and battery is dead.. (vacuum pump running?), air dont blow out rite vents, takes a long time for heat to blow hot even if engine is at oper temp.... minor delay in shutdown of engine.... i hooked up mityvac to ignition vacuum line and it slowly leakes down.... normal?

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83 300SD trans slipping/flairing when cold

I replaced the modulator and adjusted the pressure to factory spec about 3 months ago when I first got the car. Also at the same time I replaced most of the vac hoses and connections under the hood. The trans seemed to shift pretty good for its age, with a very small 3-4 flair.

One night after getting off the interstate 3rd gear just didn't engage. After trying to limp home for a couple minutes, I got angry I just gave it gas and all of a sudden it shifted and worked. The next day I changed the trans fluid/filter and added some Lucas. Now first thing in the morning it slips VERY bad going into 3rd and has a VERY noticeable 3-4 flair. If you floor it all gears engage solid, but it seems like it doesn't want to downshift and it seems to be shifting early too.

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