You have not loosened the retaining bolts and nut so that the adjuster will move (more than likely).
The 1985 Mercedes 190e could have a stuck choke. Check the choke mechanisms to start with, to see if that's the problem.
How do you remove a radio from a 190E?
I could be something as simple as a vacuum line off. I had overheating issues on my 1991 190E and found a vacuum check valve broken. Look near the passenger side of the engine.
Could be a problem with the Overload Relay,maybe one of the fuses need replacement!
A Mercedes 190e doesn't have a carburetor. They are fuel injected.
Could be universal joint is finished. A bad flex disk
Why does my fuel pump keep running on my 1984 190E
oil filter on a Mercedes 190E 1986 is in the back of engine
For a 190E 1984 Model, it is about 60Litres, this is 13 Gallons(UK) or 16 Gallons(US). For a 190E 1993 Model it should be the same +/- 5Litres.
On my 91 190e I had that problem once in a bit of a blonde moment. Apparently the gas tank door is linked to the door locks. The doors on the car must be unlocked for the gas tank door to open. I hope your problem is as simple as this.
Maybe brake shift cable from brake to gear shifter?
Where and how do you change the fuse for the dash bord lighting sytem in the 1993 190e 2.3l