Crank Shaft Sensor on 2001 Mercedes-Benz SLK320

Car will just shut off.... just replaced crank shaft positioner... ran fine first day... Tryed to start car next day - nothing - all lights on dash come on and the electric fan motor starts to run in the engine compartment - that it! Waited an hour - went out and car started right up ?!?!!?? What is causing this to happen ?

by in Plainfield, NH on April 12, 2011
1 answer
ANSWER by on April 12, 2011
you are describing two very different problems. engine just shutting off MIGHT be a crank sensor; you confirm that with either a diagnostic code or watching the resistance of a suspected sensor while heating it with a heat gun. the MB cranks sensors usually will fail when hot. when you have a bad crank sensor, the engine will turn over, crank and crank and crank, but will not start until it cools off. this sensor won't cause the dash lights or aux fan or a "no crank" problem. you will need someone with MB software to confirm you are getting a start signal from the DAS and then make sure that you don't simply have a dead spot on the starter.
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The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool of...
...nally while driving and won't start back up for a while. I have replaced the k40 relay and the crank shaft sensor. Neither have worked.

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