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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > M Series > E46 M3 (2001-2006)

E46 M3 (2001-2006)

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  #1  
Old 01-02-2010, 04:18 PM
tate in action tate in action is offline
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Mein Auto: 02 E46 M3
HELP car wont crank and its cold

well i havent cranked the car in a couple of days and its been cold outside. But when i first tried to crank it, it was started and then went dead. ttried it again and it did the same thing. so the third time all it wants to do is turn over. what could the problem be. ( fuel pump, fuse, etc...)

NOTE: havent checked if its getting spark or fuel yet. Im new with bimmers so please help!!!
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  #2  
Old 01-02-2010, 10:31 PM
tate in action tate in action is offline
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anything would be helpful
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  #3  
Old 01-03-2010, 09:09 PM
tate in action tate in action is offline
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come on peeps
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  #4  
Old 01-03-2010, 09:10 PM
Ryan M Ryan M is offline
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So the car does crank? As in the starter turns correct?
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  #5  
Old 01-03-2010, 09:19 PM
tate in action tate in action is offline
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no the car will turn over but not crank
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  #6  
Old 01-03-2010, 09:20 PM
Ryan M Ryan M is offline
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Quote:
Originally Posted by tate in action View Post
no the car will turn over but not crank
Ok. You have confused me. How can a car turn over but not crank? Sorry I'm a little lost.
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For Sale: M60B30 intake manifold, M50 intake manifold, 2.81 differential, new OEM upper control arm bushings, 8 M62 fuel injectors.
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  #7  
Old 01-03-2010, 09:32 PM
tate in action tate in action is offline
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Mein Auto: 02 E46 M3
the starter just sits their and spins. but it seemslike their is not getting any gas or spark
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  #8  
Old 01-03-2010, 09:41 PM
Ryan M Ryan M is offline
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Ok, so the car does crank. So the starter works. I would check for fuel first. Check for any blown fuses first. If all are good, access the fuel pump. Have somone turn the key all the way but do not start the car. You should hear the fuel pump buzz for a second or two as it is energized. If you hear no buzzing, unplug the harness that connects to the pump. Connect a voltmeter to the harness. Have someone turn the key all the way again but do not crank the car. You should get battery voltage at the connector for about 2 seconds. This is why you need someone to turn the key for you, otherwise if you do it yourself you may miss it. If you do get battery voltage, your fuel pump may be shot. It you do not get voltage, go to the fuel pump relay. Pull the relay and insert a jumper wire. Turn the key again. If you now get voltage at the harness connectory, then you need a new relay. If you still get no voltage at the connector, then you have an open circuit in the wiring. Really the best way to check for a proper working fuel pump is to simply connect a fuel pressure guage to the rail, and try to start the car. But I'm assuming you don't have one, so this method will also work. Try these steps and get back to us.

Also, if you hear the pump buzzing, that is not an indication that it is working properly. All this means is that it's getting voltage. It could still be weak.
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  #9  
Old 01-03-2010, 09:44 PM
tate in action tate in action is offline
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thanks for all the help man and ill check everything out in the mornin. but thanks again man
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  #10  
Old 01-03-2010, 09:46 PM
Ryan M Ryan M is offline
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You're welcome.
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For Sale: M60B30 intake manifold, M50 intake manifold, 2.81 differential, new OEM upper control arm bushings, 8 M62 fuel injectors.
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