Transmission shifting cold-arrh! - PeachParts Mercedes-Benz Forum

samiam4 · #1 11-08-2003, 12:57 PM

Hello guys,

Just though I'd pick everyone's brain this morning. I wentout today and drove the old diesel. It didn't upshift until I hit the hash marks for shift points.

Would this be an aging seal problem or a modulator/vacuum problem??

Michael

Fisherman · #2 11-11-2003, 04:51 PM

My guess is, based on my limited knowledge of my tranny, is that you have lost vacuum to the transmission... Done any work on it lately where you might have bumped off a hose connection?

Check your vacuum hoses for leaks and if you have a mity vac try pulling a vacuum on the transmission shift line. It will most likely come off the block on top of the valve cover and then diappear somewhere behind the IP. Black on my car.

If you have a relief valve on the tiop of the IP for the vacuum this might also be the cluprit if it has gone bad and is allowing air in and thereby loss of vacuum. Youc an take it out of the circuit easily to test this.

In my expereince my car will shift harder in the mornings until it warms up a bit. Makes for all kinds of fun when the snow has fallen...

samiam4 · #3 11-11-2003, 10:58 PM

Yea- but it shifts normally when hot.

I will check the vacuum stuff. I was hoping it could be a bad modulator instead of a "tired" transmission. I think cold shifting problems are ussually aging seals within.

Michael

Fisherman · #4 11-11-2003, 11:24 PM

That means my tranny is dying? Oh well it should I guess with the neglect from the PO...

samiam4 · #5 11-12-2003, 01:03 PM

while I'm not a transmission expert...

My understanding was as the seals get old and hard, cold performance suffers first. That and how many seconds it take reverse to engage. Longer time indicating more wear on the clutch plates.

Michael