Quote:
Originally Posted by 300SD81
From the 5 threads I read on the subject, I'm pretty sure I did it right, since it was mentioned that the black box controls only the EGR. But somewhere else I read that it also had something to do with the trans, o now I'm worried, since I broke the black box while trying to remove it.
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The black box does have something to do with the trans. When vacuum leaks from the box due to the bad 3/2 switches, the trans will see lowered vacuum levels and the vehicle will shift harsh.
Getting rid of the function of the black box is precisely what is required to improve the shifts.
Note that the black box may have some direct control of the transmission on older W123 vehicles, therefore the ensuing arguments on the forum. On the SD, however, this is not the case. The black box controls only EGR for all models of the W126 from '81 to '84.