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Old 11-20-2012, 01:13 AM
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acoste acoste is offline
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Location: California
Join Date: Nov 2011
Posts: 3,272
Mein Auto: 2010 550i MT
Originally Posted by neonphire8604 View Post
1998 540i M62 non vanos engine

I just finished replacing the clutch and now the car wont start. It will crank for what sounds about 1 revolution and cut out and continue.When it cuts out the steering wheel will go up and down as if the ignition switch is shut off and on. The thing that puzzles me the most is that it will crank normally if I unplug the crank sensor.


the cranking will stop if the speed of the engine is too low during cranking. The engine speed is measured by the crank sensor therefore when you disconnect this sensor, the "cranking speed monitoring" function will shut off and let you crank as long as you want.

Now the question is why is the cranking too slow?
Either the resistance of the engine / crank shaft is too high (unlikely) or
this is an electrical issue. High resistance (= bad contact) in the main path from the battery to the starter. Or the starter itself. Did you remove starter cables during clutch job? Are these tightened correctly?
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