Dismantling Throttle switch M117

[Graham]

I found the pictures that barri posted with his TPS in pieces. But, I am a bit afraid to start prying mine apart. The plastic is 37 years old and seems brittle. Any tricks that might help?\

ADDED: Not to worry - I got it done.

Made up a pdf of sequence. Here is a link:

http://home.cogeco.ca/~mbz/Adjusting and Cleaning TPS on R107 Mercedes.pdf

[Graham]

Edited above post to reflect what I did today

[meltedpanda]

nice work and write up , did it help? DO you think this was the first time serviced, looked clean??

[Graham]

Originally Posted by meltedpanda

nice work and write up , did it help? DO you think this was the first time serviced, looked clean??

It was not bad. Looked quite clean except for skid marks across zig-zag contacts.

Did it help? Well, Hard to say! I did start engine this evening but it ran just awfully! I had vacuum gauge attached. With throttle plate closed, I had ZERO vacuum! Had to shut down because we were going out for dinner.

Over dinner friend said it just could not have ZERO vacuum. Well he was of course right. Came home and tried to blow through port that feeds vacuum to distributor. It is blocked!

I looked on inside of throttle body but did not see any opening. Looking for drawing or advice on how to get it cleared!

[meltedpanda]

did you get that sorted out?
I can look on mine if you would like

[Graham]

Originally Posted by meltedpanda

did you get that sorted out?
I can look on mine if you would like

I found the throttle body port was plugged. I cleared it by pushing a thin wire through the port and then flushing with solvent. I now get a vacuum reading!

But as outlined in my other post, my problems are far from over!

Sounds like I do need to do the intake donuts, but not sure if that is the main problem or not.

I would be interested to know if other D-Jet SLs have black deposits on the inside of the throttle body below the throttle plate. It was those deposits that blocked the vacuum port.

The other thing I would be interested in, is the position of the vacuum port when the throttle is closed. I thought it should be just below the plate, but on my car it is essentially blocking the port. But not so much that it won't pull a vacuum. I tried to adjust the stop, but it's awkward to do, so gave up for the night!

[meltedpanda]

mine does not have black soot, and mine ( vacuum port) is definitely below the plate
Sounds like it may be part of your issue!

[Graham]

Originally Posted by meltedpanda

mine does not have black soot, and mine ( vacuum port) is definitely below the plate
Sounds like it may be part of your issue!

Thanks for checking!

Today I measured 16.5" vac - lower than it used to be. But I guess the throttle plate must be closed otherwise I wouldn't even get that.