Quite possibly a stupid vacuum testing question - Page 2 - PeachParts Mercedes-Benz Forum

vwnate1 · #16 07-10-2019, 10:43 AM

I don't think any of the OP's questions are foolish much less stupid ~ not knowing a thing isn't stupid and asking so you don't screw things up is smart in my view .

JHZR2 · #17 07-10-2019, 04:43 PM

Quote:

Originally Posted by Diseasel300

Vacuum to the modulator softens the shift. Typically the modulator vacuum is somewhere around 12" at idle. I'd expect more vacuum to make the shift even softer, or if the modulator is maxed out at that point, make no difference at all. Try replacing the cap and see where it gets you before going nuts trying to fix a problem that may not exist.

Agree with all of this. Shifts besides that 2-1 coming to a stop are perfect, zero complaints.

Cap should be delivered today!

JHZR2 · #18 07-10-2019, 05:01 PM

Quote:

Originally Posted by vwnate1

Thank you ! .

I can always trust the brain trust here to teach me new things ~ I thought there was only one vacuum element in the Coupe's seat back....

For the OP : the seat back locking vacuum circuit is all in blue and almost always leaks, it's a simple thing to cap it off under the hood for testing .

Vacuum leak testing is simple if tedious .

I learned that there’s four because one doesn’t lock in operation. You’re right, isolating that system and changing the five-way to a four-way vac splitter is easy to do.

Alas that’s not the end-all for a very slow leak down.