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Turning key,Starter engages for split second then nothing. Jumped relay, and confirmed starter functions normally. Good hot battery. Car is 2002 E430. Anyone run into this??
 

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I have heard putting some never seize on the flywheel teeth works for this. not a lot but thin coating.
 

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My guess is something is telling it to stop cranking? I don't know what all is involved in that but I'd assume the ecu reads the crank sensor rpm and decides to kill starter power at xx rpm, like 300? Just a guess but I suppose I'd try to see if there are any codes telling of some stupid failed part that may cause that to read wrong.
If all fails I'd just put a little push button on the dash that bypasses whatever bs and just cranks it. My truck is like that, which I did for different reasons but the starter is a little teeny push button and next to it is a teeny toggle switch for the ignition. Then teeny toggles for cooling fans, fuel pump etc. Old school and no electrical problems :)
 
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