Guys,
My '85 300D all of the sudden shuts off very slowly, but eventually does. Vacuum leak or bad shut off valve, easy I thought...
Here's what I checked with the MityVac:
(precursor - EGR vacuum stuff is all gone)
1.) Vac Pump puts out 22 mmHg vacuum to master brake line
2.) Brake booster does not leak, held vacuum for a good long time
3.) All underhood rubber replaced or are verified as leak free
4.) Car shuts off after two pumps of mity vac when connected directly to shut off valve.
5.) Additionally, shut off valve holds vacuum
6.) Car shuts off in two pumps of mity vac when connected to shut off valve through ignition shut off switch
7.) The car WILL NOT shut off if only the shut off valve is connected to the master brake line, and everything else is t'eed of. Said another way, with the shut off valve being the only vacuum accessory connected, the car won't shut off from it's own vacuum supply.
Any ideas? Could anyone follow my explantion?
Im stumped. The only things I can think of are somehow the ignition housing vac switch is bad, OR something is wrong with the master brake line. But i dont understand why the mty vac shuts it off easily.
Sorry for the long post...
dd