W201, BENZ AID - COMMON QUESTIONS AND ANSWERS

1985 300D Turbo, CA mod. w/ trap oxidizer: vacuum line connection

After doing some engine work, I could not get the engine to shut off. I checked all the vacuum lines and connections, which were ok, including testing the fuel shutoff valve and checking the line to it for grease (none). From previous testing, I know that the vacuum pump works well. I thoroughly studied the "Vacuum System Troubleshooting" manual. I noticed that there is one black vacuum line which remains unconnected, the one with a damper from the vacuum transducer which supposedly goes to the automatic transmission vacuum modulator. When I plug this line with my finger, the engine stops.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

89 560sl light indicator on after brake pedal pressed

The dashboard light indicator comes on after pressing the brake pedal the first time after starting up. I've checked bulbs and all work but am not sure if they are the correct p/n. All have nickel/silver bases which I understand they should be as I was told the copper/gold bases run hot and tend to fool the light module into turning on the indicator. I just recently got this vehicle and it appears the previous owner had a problem with the 3rd brake light as it has been resoldered and has a broken holder. It functions but I am not sure it has the correct bulb installed.

Chassis Model Number

R107

Forums

Body and Interior Specific Aid

'83 300SD Missing switch above domelight?

I've been working on getting my '83 300SD back to fighting fit and I'm beginning to move on to cosmetic issues now. One thing that has been driving me nuts is a hole in the headliner, not a cigarette burn, but one that was made into it. It's about an inch square and has has molded, rounded edges. It's about an inch above or aft of the domelight. My SD has a sunroof, but the switch for that is in the cluster above the climate controls. Can anyone tell me what this hole is for?

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

300SD with 420SEL Final Drive question

Kent,

I replaced the rear axle assembly, axles and final drive, of my 1983 300SD with one from a 1991 420SEL. I really like the result with one exception: the speedometer is off (something was wrong when I started passing everybody on the highway at 55 mph). I read somewhere that the problem would be fixed if I repalce the speedometer with one from a 420SEL. Does that make sense? The 420 has a speed sensor in the final drive, the 300SD gets it speed information apparently from somewhere else. Any suggestions would be appreciated.

Thank you
Dieter

Chassis Model Number

W126

Forums

Transmission / Suspension Specific Aid

Injector crush washer centers missing? 300TD '85

A couple of months ago I replaced my injectors with new crush washers. Now, after a compression test & valve adjustment the centers of two of the washers were missing (and one was broken, about to fall out!) The injectors were torqued with a true torque wrench to the right amount. Where did those centers go? Did they simply disintegrate like happened in my '78 diesel VW or are they destroying my engine? Unfortunately I also have a new noise at certain RPMs and when shutting down.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1987 300SDL Power Seats not moving back and forth

When I operate the seat switches on the doors(driver's and passenger's), only the seat backs will fold forward or backwards. The seat bottoms will not move forward or backwards, but the seat bottoms will move up and down. My 5foot tall wife cannot drive our Mercedes since it is set to my 6 foot height! Benz-aid help needed! Thank you.

Chassis Model Number

W126

Forums

Body and Interior Specific Aid

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