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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 01-29-2011, 11:57 AM   #1 (permalink)
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2001 e39 530i has a hard time starting in the cold

my e39 has a hard time starting in the cold. It just cranks and cranks and takes forever to turn over. Ive changed the cps sensor that had went bad but the problem still continues. But once the car has started it starts back up the only time it struggles to start is when i let it sit over night in the cold. Anyone might know what this could be?
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Old 01-29-2011, 05:21 PM   #2 (permalink)
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Welcome to the Werkz.

How cold does it get overnight?
Can you hear your fuel pump buzzing (for ~2 seconds) when you first turn the key to position II?
How long have you had the car for, i.e. has it performed through cold weather previously?
Is your battery in good condition?
If the engine starts and you kill it immediately (before it warms up) will it start again without any issues, or does it go through the same process if you don't let it run for a while?
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Old 01-29-2011, 07:39 PM   #3 (permalink)
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about the 20's i havent heard the fuel pump buzz ive had 3 years now its got 110 000 miles on it and its been fine throughout the cold until recently if it starts and i kill it immediately i have to go through the same process
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Old 01-29-2011, 08:08 PM   #4 (permalink)
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What grade oil are you using? Are there any other unusal noises associayed with the cranking stage?
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Old 02-02-2011, 02:25 PM   #5 (permalink)
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im using 5w-30 and no unusual noises at all just has a hard time turning over
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Old 02-03-2011, 04:52 AM   #6 (permalink)
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Once the car starts, is the idle smooth and steady?
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Old 02-05-2011, 02:31 PM   #7 (permalink)
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yes the idle is smooth and steady and there are no other issues with the car
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Old 02-05-2011, 11:57 PM   #8 (permalink)
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When its cranking over (but not yet started) is there a smell of unburnt fuel from the exhaust, and are you able check that you have a good solid spark?
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