After reading the forum posts and trying to diagnose the problem with the best of my abilities and the tools I have, I've desided to post my progress so far.
The car in question is a late 1991-1992 600SE, engine code M102.980 or 982 (not entirely sure which one, just searched info from the net with the cars plates)
It's been left untouched since 2014 due to engine problems (rough idling, cylinders not firing etc. and right signal lamps on constantly when battery is connected)
So far both distributor caps and rotors have been changed (new bosch with identical codes) and spark plugs.
I also replaced the MAF wires to the computers (previous owner only changed the connectors and small part of the wires, originals were dust), rest of the wires in the box and harness were good looking, no cracks visible.
The injector harness top of the engine appears to be replaced (bright coloring compared to original, no cracks anywhere).
Before starting i changed the oil and found nothing out of the ordinary like flakes of metal or coolant. Only mild gasoline smell. I did spray some oil to each of the cylinders and let it sit for a day before cranking it for a first time.
The engine won't get spark to the driver side bank. I have swapped pretty much everything that can be swapped (ignition coils, ignition boxes, distributor caps, spark plug wires, cam sensors, MAF sensors)
But still the left bank won't get spark properly compared to the right. Only one weak spark occationaly.
I also constructed the blinker code reader and read the codes from the diagnostic port.
The codes reported that the crankshaft position sensors are bad. I read that they are pretty hard to replace without removing the engine.
I checked the wires and connectors to the ignition boxes and they seem to have been changed also (brand new looking, no dust or grime compared to factory wires next to them). They are 3-pin connectors. I read that there is some difference in them.
Should I try to replace them or is there something else that I should try before completely disassembling the engine and finding out that the problem was somewhere else?
I was also wondering that could the swapping have caused some codes to appear?
I don't have a star-reader or know anyone that can lend it in my area (Finland).
I apologize for my long and messy first post and possible errors in my writing. Please correct me if there is some confusions.
The car in question is a late 1991-1992 600SE, engine code M102.980 or 982 (not entirely sure which one, just searched info from the net with the cars plates)
It's been left untouched since 2014 due to engine problems (rough idling, cylinders not firing etc. and right signal lamps on constantly when battery is connected)
So far both distributor caps and rotors have been changed (new bosch with identical codes) and spark plugs.
I also replaced the MAF wires to the computers (previous owner only changed the connectors and small part of the wires, originals were dust), rest of the wires in the box and harness were good looking, no cracks visible.
The injector harness top of the engine appears to be replaced (bright coloring compared to original, no cracks anywhere).
Before starting i changed the oil and found nothing out of the ordinary like flakes of metal or coolant. Only mild gasoline smell. I did spray some oil to each of the cylinders and let it sit for a day before cranking it for a first time.
The engine won't get spark to the driver side bank. I have swapped pretty much everything that can be swapped (ignition coils, ignition boxes, distributor caps, spark plug wires, cam sensors, MAF sensors)
But still the left bank won't get spark properly compared to the right. Only one weak spark occationaly.
I also constructed the blinker code reader and read the codes from the diagnostic port.
The codes reported that the crankshaft position sensors are bad. I read that they are pretty hard to replace without removing the engine.
I checked the wires and connectors to the ignition boxes and they seem to have been changed also (brand new looking, no dust or grime compared to factory wires next to them). They are 3-pin connectors. I read that there is some difference in them.
Should I try to replace them or is there something else that I should try before completely disassembling the engine and finding out that the problem was somewhere else?
I was also wondering that could the swapping have caused some codes to appear?
I don't have a star-reader or know anyone that can lend it in my area (Finland).
I apologize for my long and messy first post and possible errors in my writing. Please correct me if there is some confusions.
). So the knock sensors are new. Measured both crank position sensors and the right one showed exactly 800 ohms. The left one was dead. So it seems that I have to figure how to get to that sensor.
