I was driving my 89 300ce around 45 miles/hr and slowing down to the stop light. I stopped , the engine cut off and all the lights came on. I started the engine again and drove another 100 miles (stop and go traffic) without any problem. This was the first time happened to me. Any idea? Should I take it to the shop and check it out or do some DIY myself?

Very similar to problems I am having with my 89 190e. Turns out I had no voltage going to the idle air control valve. Still trying to track down where the voltage is lost but have unplugged to ICV and it has not done it since. Might want to try that until you can figure out if you have voltage to the ICV or not.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners

Hi 190e, How can I find out the voltage of ICV? Where is ICV?

Not sure on the 300 but the 190 the ICV is right in front of the fuel tower. You can tell it by the two rubber hoses running from the manifold to the intake.

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89 190E
2.6L
Arctic white
Grey leather
Sunroof
Pirelli P400 rubber
Smoked corners

A combination of old, hard hoses and a dirty ICV will do this -- valve closes to slow the car down, then fails to open as the rpms drop, causing a quiet stall -- engine just quits turning, no shaking, etc.

Clean the valve by filling with carb cleaner, covering the holes, and shaking for 15 sec, then dump the solvent, until it stays clear. This will take a while, probably tons of residue in there.

If the idle control hoses are not fairly soft, replace them.

If you get occasional stalls while just driving, replace the fuel pump relay.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Thank you very much. I will do that ASAP.