namasgt

That vacuum module (its green in color) is like 30 bucks for a new one. But if failed will not cause the car to not go in gear, many break the vacuum line during an intake refresh without realizing it then they wonder why their car is shifting hard. Or the module could fail which seem to be the case with yours.

MainePorsche

Some have said it would not cause my symptoms, and some have said it could. I'm still not out of the tall grass until I drop the pan and look for presence of 'things'. As I was planning to check the modulator and its line, now that I see the modulator has failed I will change it out no matter what else I find on this sojourn.

the flyin' scotsman

Craig.......sorry to hear the tranny has such issues.

If I were you Id seek further counsel as to cost of repair given the possibility of fragments throughout the assembly versus a complete new or refurbed gbox.

The rest of the car and budget of course will play large......good luck.

Landseer

Hoping its something simple, like low fluid or some problem with the shift linkage cable or linkage mechanism. Maybe, like lots of 928 issues, multiple problems.

(I've had an otherwise operational transmission with a broken parking pawl, and it doesn't sound like the issue on your car --- unless somebody tried to drag it away while it was parked and broke everything inside including the pawl and the operating parts.)


Here are some pictures of the shift linkage and axle.
Maybe its somehow spinning inside.

(Looking for parking pawl pictures, its on the output shaft end of trans.)

Landseer

Here's the parking pawl, broken one installed, new one in foreground.
Mine broke and destroyed the transmission case and it leaked.

MainePorsche

Thanks for the thought.
If I find damaged component(s) when I drop the pan (spring, clips,other sundry items...) is it a mortal sign for the transmission or can (I would think) these items be replaced and re-seated ?

Mrmerlin

the hot setup would be to buy a brand new transmission from GB it would be a plug and play install

G8RB8

How did this turn out?

MainePorsche

Hey Jim.
I let it alone for a few days until the trans pan gasket, filter, and replacement modulator came in. I didn't want to drop the pan and leave it open for days. According to tracking, should be here this afternoon. I will post back.
Thanks,
Craig

O.B.1

Good Luck.....hope it's something simple

MainePorsche

Thanks very much.
I'm removing the modulator now, and when the parts arrive I'll post back if I find 'loose change' in the pan.

MainePorsche

Guys, a quick question. On the above MB repair guide supplied by Jim, on page 4.6/1 I note a spring that goes over the thrust pin and modulator valve. I do not see this spring on PET for my MY, and I did not find it when I removed the modulator apparatus. Before I put the new vacuum unit in, I just wanted to clear with the more knowledgable regarding the absence of the spring.
Once I put the vacuum unit back, I will next drop the pan and see what's there.
Thanks,
Craig

MainePorsche

Well Boys,
Dropped the pan and nothing in it. No springs, not metal bits.

rexpontius

Thats a good sign, what did the oil look/smell like?

the flyin' scotsman

Not sure the failure modes of the modulator but hopefully the failure was contained and not spread throughout........good news I believe.

What does the old modulator look like?