MY 86 190E 16V FEELS AS IF IM BEEN REAR ENDED EVERY TIME I CHANGE GEARS. I'VE DRAINED AND REFILLED MY MANUAL TRAN. FLUID BUT THAT DIDN'T SOLVED THE PROBLEM.
"WHAT ARE YOU TALKING ABOUT WHEN YOU REFER TO THE MODULATOR"? HOW DO YOU CHECK IT?
MY CAR ALSO STALLS ON ME AT LEAST 2 TIMES IN A MONTHS PERIOD. I THINK IT MIGHT BE THE AIR FLOW SENSOR. I'VE TAKEN IT TO AT LEAST 2 MERCEDES TECHNICIANS AND BOTH HAVE FAIL TO FIND THE PROBLEM.
"CAN THE AIR FLOW SENSOR BE CHECK? HOW DO YOU CHECK IT OR HOW DO YOU TELL A TECHNICIAN TO CHECK IT? THANK YOU!!!!!

First your vehicle is manual trans there is no modulator valve (only in auto trans)
any good MB tech should know how to check it.
find someone know about MB to test for you.

Is the car stalling at idle or at speed? And have you had the driveshaft front flex disc checked for damage??

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

BENZMAC, MY CAR USE TO STALL ON ME AT LEAST OUNCE EVERY DAY WHEN DRIVING IN THE FREEWAY. I TOOK IT TO A GERMAN AUTOMOTIVE TECHNICIAN AND HE REPAIRED THE PROBLEM (SAYING MY FUEL INJECTORS HAD A LITTLE RUST IN THEM)
THE CAR STOP STALLING ON ME FOR AT LEAST 3 MONTHS, BUT JUST 3 WEEKS FROM TODAY I'VE HAD THE STALLING RETURNED. AND TO ANSWER YOUR QUESTION - THE STALLING OCCURS "IN SPEED" OR DURING THE PROCESS OF STARTING TO MOVE, AND MY IDLE MOST OF THE TIME FLUCTUATES FROM 800 TO 1200RPM.(THE ONLY DIFFENCE BETWEEN THESE STALLS AND THE ONES' EXPERIENCE BEFORE IS "THEY HAPPEN LESS FREQUENTLY AND IT TAKES AT LEAST 3 RESTARS AS OPPOSED TO THE 1 IT TOOK BEFORE)
BENZMAC, HOW MUCH WOULD YOU SAT IT WILL COST ME TO HAVE THE DRIVESHAFT FLEX DISC CHECKED OUT?

THANK'S FOR YOUR TIME, IT IS APPRECIATED!!!!!

It should be free to have the disc inspected. If it is faulty it is not an expensive repair. Sorry though I don't know the cost of the part. As for the stalling, I would have the fuel pump relay checked out soon.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM