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Old 08-05-2017, 05:39 AM
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Join Date: Jun 2017
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Unhappy 1991 500 SL engine cuts out

1991 500 SL Engine cuts out
Hi people. I have a fault on my merc 500SL which is:-

From cold engine starts and runs fine until the temperature reaches around 80 deg then when you come off the accelerator (gas) pedal the engine cuts out, if the car is moving fast enough only the rev counter drops and no warning lights come on, then just touch the gas pedal and engine comes back in . However if your travelling slow engine cuts out charging light comes on and you have no power steering and brakes. It will do this 3 to 4 times over a couple of minutes then be fine for the rest of the day. If its started from cold and left ticking over until it reaches running temperature it does not cut out.
It always happens on or around 80 deg and i suspect its the fuel being cut off until the temp rises a little more.

Anyone got any ideas Thanks
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Old 08-05-2017, 09:42 AM
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Join Date: Jan 2012
Posts: 7,179
The usual suspect is the crankshaft position sensor for the ignition system ( reads from flywheel ) . Changing this is usually work the risk of throwing parts at a car.

Hook a light and / or pressure gauge to the fuel system to see if it is dropping out.
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