W126

1983 300SD vacuum diagnosis

Hi, All,

I have isolated a vacuum problem to the red/green plastic line that services (I think) interior switches and servos: with this red/green line attached to its fitting on the vac system, system pressure drops from 45m/g to 15m/g or less with the engine running. When the car is turned OFF, the line holds vacuum (??); when the car is ON, its as if it's open on the other end, bleeding off vacuum (brakes go hard after 2-3 pumps; engine won't shut off if at idle awhile).

Does this behavior suggest a specific component that I should go after?

Thanks in advance!

Chassis Model Number

Forums

1985 w126 300sd cental locking system failure to lock

I have posted this question on a few other Mercedes Forums with no assistance. So...I have paid the 30 bucks for hopefully some light to be shed.

I have a strange problem with my central locks.

The problem I am having is that locking any controlling (driver passenger trunk)lock will cause all locks to unlock but it is impossible to lock the doors. I obviously have no leaks.

What I have so far.
I have run the pump on the bench and if I ground any of the 3 pins the pump pulls untill the vac switch makes. Then if I apply 12v to a pin the pump pushes until the press switch makes. This seems to make sense. Keep in mind I did not test the pump with a constant 12v on any pins and I will try that later today.

I also tested the wiring in the car and all is correct.

Chassis Model Number

Forums

1986 300SDL WVO oil filter

Has anyone developed a way to predict that your FM100 (or other WVO filter) is getting clogged? i have found that i don't have much warning when it is starting to affect the performance of my car. If i didn't have the option of switching to my second tank (diesel fuel) it might really get in trouble some time on a longer trip.
Is there a way to do it with a pressure gauge prior to the filter.....?

Interested in you comments.

Scott

Chassis Model Number

Forums

Pages