MY MERCEDES 300E +- 1987. WITH BOSCH FUEL SYSTEM CUTS OUT WHEN COLD AND SOMETIMES WHEN HOT. I HAVE CHANGED PLUGS, CLEANED AND CHECKED DISTRIBUTOR CAP,REPLACED FUEL FILTER,USED INJECTOR CLEANER WITH THE FUEL, CHECKED INJECTORS FOR SPRAY.PROBLEM PERSISTS.
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Under the airfilter assembly and part of the Fuel distributator.
rarley the problem usually a vacuum related issue in mercedes 124s.
see my other post on 300E rough Idle. THis care uses a hybrid bosch mechanical electronic fuel delivery system. easy to diagnose and assumptions are usually wrong. try w124zone for basic information.
Check the battery condition, battery state of
charge and starter motor current draw. Replace the battery if marginal
and the starter motor if the current draw is beyond specification.
Check the battery cable condition. Clean the battery terminals and replace corroded or damaged cables.
Check the fuel system for proper operation. A
fuel pump with insufficient fuel pressure or clogged injectors should
Check the engine's tune-up status. Note the
tune-up specifications and check for items such as severely worn spark
plugs; adjust or replace as needed. On vehicles with manually
adjusted valve clearances, check for tight valves and adjust to
Check for a failed coolant temperature sensor, and replace if out of specification.
heck the operation of the engine management systems for fuel and ignition; repair or replace failed components as necessary.
I had this once, get the car running and turn the ignition key very slightly and very lightly from side to side while the engine is at idle, this may show up a faulty ignition switch if the engine cuts when you're turning it.
Also the ecu on the nearside inner wing may be at fault, see if you can find a friend with the same car to try swapping over to his first to test as they are expensive is this isn't the problem.
Finally, a common fault with these cars is the fuel pump relay, its the biggest black plastic covered relay in the fuse/relay box, at the rear of the front offside inner wing area.
hi,seem all part have been check,to check further,you need to use a pressure gauge, to check the lower and upper chamber of your fuel distributor,only dealer have the tools,valve clearance is a hydraulic valve,no need to adjust,seem your car start,engine timing is ok,ty