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  #1  
Old 01-07-2020, 04:52 PM
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Talking 2002 E53 3.0i Intermittent no crank/start

So iíve looked around the forums a bit and havenít really seen anybody talking about the issue iím having. If I may have missed it, feel free to link the forum below. Iíve got a 02 E53 3.0i with 175k miles. The issue started around the same time last year (December in Maryland) and pretty much stopped around the spring so I havenít fully ruled out the cold but iíd prefer not to have to deal with this everytime it gets moderately cold. Iíve found a way of dealing with it, which iíll mention soon. What happens when I get in the car and try to turn the key, turns all the way, all of my dash lights come on, interior lights work, hell even my stereo, amp and sub work but it doesnít crank, it makes one single click when I turn the key completely. The way iíve found around it is to pop the trunk, unhook my sub, open the spare/battery hatch and lightly tug on the positive cable, it doesnít always work after one light tug but it always eventually will allow me to go back and turn the key and itíll start right up. Before anyone asks, no the terminal is not loose, it doesnít budge on the battery even a bit. I donít believe itís a faulty BST (am I getting that right? it is a BST correct?) because as far as I know the vehicles never been in an accident. Does anyone have any ideas? I will say I havenít checked any fuses yet... probably should have
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Old 01-07-2020, 05:16 PM
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Have you measured voltage of your battery ? How new is it? Sounds a little like the battery has deteriorated inside. I had a car once where you could only start it if you jiggled the battery..In that case it was time for a new battery.
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Old 01-07-2020, 05:31 PM
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Originally Posted by Effduration View Post
Have you measured voltage of your battery ? How new is it? Sounds a little like the battery has deteriorated inside. I had a car once where you could only start it if you jiggled the battery..In that case it was time for a new battery.
I have not measured it yet, itís snowing pretty badly out right now so once it dies down iíll go out and check.
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Old 01-07-2020, 07:51 PM
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Itís a common issue for the e53 ignition switch to fail with those symptoms.
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Old 01-07-2020, 08:55 PM
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Originally Posted by andrewwynn View Post
Itís a common issue for the e53 ignition switch to fail with those symptoms.
I know this and iíve come across it here on the forums multiple times but would it really work again after wiggling the cable? that doesnít make sense to me.
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Old 01-07-2020, 10:56 PM
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I missed the query about the BST. You can determine if itís bst by measuring voltage from B+ to ground under the hood before and after the tug.

If you have no voltage at B+ before tug and after you have voltage itís the BST.

BST could only act like this if not activated by an accident. The BST when blown has barbs that prevent the contact from closing.
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Old 01-08-2020, 03:02 AM
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Originally Posted by andrewwynn View Post
I missed the query about the BST. You can determine if itís bst by measuring voltage from B+ to ground under the hood before and after the tug.

If you have no voltage at B+ before tug and after you have voltage itís the BST.

BST could only act like this if not activated by an accident. The BST when blown has barbs that prevent the contact from closing.
Okay! Guess iíll keep a voltmeter on me for now until it happens again
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Old 01-08-2020, 01:39 PM
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Okay! Guess iíll keep a voltmeter on me for now until it happens again
quick question, would it be acceptable to check at the B+ in the engine bay?
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Old 01-08-2020, 01:42 PM
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Thatís where you have to test it. If the BST opens there will be no per there.

Caveat: itís possible to just become high resistance and youíll still read voltage until you attempt to pull current so if at first you read voltage, then check while attempting to crank
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Old 01-08-2020, 02:47 PM
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Mine does the same thing. I just turn the key off and try again and it always spins the starter the second time. So I'm thinking probably the switch. At my mileage, I can't complain.


2002 X5 3.0 370,600 miles
2014 428i 65,200 miles


2004 325i sold at 123,600 miles
2001 325i sold at 66,000 miles


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