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2001 Mercedes-Benz SLK320 Question: Crank Shaft Sensor

 

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larryenoti, Plainfield, NH, April 12, 2011, 08:07
 Rookie

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 ?

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  • Answer #1

    overbys from Overbys Inc, April 12, 2011, 10:55
     Master

    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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