I have a temperature problem on my 1987 300e. When the engine temp warms to 100 C' the engine will stall. In this stalling condition the fuel pumps will not come on. Could this be the temperature sensor in the head on the left hand side, or low coolant level, or maybe a defective fuel pump relay?????

You can try by-passing the fuel pump relay & see if the stalling problem stops.

Could be the relay OR RPM signal from ignition system.

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theres a tsb on the rpm signal

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

What is a tsb??????????

Technical Service Bulletin

When the temp sensor on the head is no longer functional, the engine is only affected during cold startup. I know because I broke it 2 days ago and the change was very obvious. Once the engine warmed up I didn't notice any difference. I got a used one today and the change back was obvious. Having the 87 model, we get the fragile green 2 prong sensor instead of the plug and it will crack easy if any pressure is applied. Once cracked its toast because the wire that goes through is molded to the plastic with no slack so any cracks and the wire tears.

I would look into the FPR first as MB Doc said.

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