1991 300e stalling after 10 minutes
have a 1991 300 E 2.6 after idleing for about 10 minutes the ca starts coughing and spitting and stalls out.Cannot restart until it cools down. I have replaced the coil,OVP Relay,Plugs,Cap and Rotor ,coil , Reference sensor,checked fuel pressure OK,O2 sensor and the car still does it.Seems like it quits getting spark,because when you do try to restart it backfires a bit.Any suggestions as to what this could be?I'm mechanically savy,but this one has me baffeled. Thanks for any help.

Mike

Several years ago, I had the exact same problem on a 260E, with the same engine. The culprit:

"Crankshaft Position Sender Unit" -- or Crank Sensor, in plain English.

It is a cable that runs from the back of the engine to the EZL(??) on the left fender. The insulation on the engine connection eroded away, exposing bare wires, which would short out when the engine got hot, but behave normally once it cooled.

About a $150 repair, parts + Labor.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black

I agree!

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

I have already replaced Crank position sensor. Still stalls

Thanks for the info .I will give this a try even though I do have fuel pressure when the car won't start.

OK, but is the fuel pump/pumps running when trying to re-start the car?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

What is the fuel pressure and where did you place the gauge?

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician