Date registered: Sep 2004
Vehicle: 2014 E250 Bluetec 4-Matic, 1983 240D 4-Speed
Mentioned: 3 Post(s)
Quoted: 256 Post(s)
I don't have any 8 valve 190E experience but I think many of the fuel and ignition features are the same. On a 16 valve 190E there is a set of micro switches on the throttle linkage to shut the fuel off when you remove your foot from the throttle pedal at load abruptly, then, by having the linkage drop to its idle position and close the lower micro switch, set the computer to catch the rpm dropping through around 1800 rpm so that it idles. If the second micro switch is either broken or gummed up you don't give the computer the signal and you get a stall. I have had to clean this item on each of our 16 valve units several times.
The same with the "idle motor" between cylinders 2 and 3. We have to remove it and soak it in Sea Foam or the like overnight and then drain it and put it back in - if it is gummed up it may seem to work when you bench test it, but if it is reacting too slowly and you have that fuel saving micro switch bullshit set up it lets the car stall. I do not believe all the vehicles of the era had the micro switch set up. While it is a complication and needs to be attended to once the area gets gunked with dirt and grease and the like, the switches are simple and reliable. Just the linkage that needs to be kept clean. I use a spray electrical part cleaner liberally and then spray it with a lithium grease lube lightly.
Good luck - this stuff can be a pain. But it sounds like the car restarts, so, remember, shit can be worse. Count your "blessings."