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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 08-31-2009, 04:02 PM   #1 (permalink)
n00b
 
Join Date: Aug 2009
Car: 1998 323is & 1995 525i
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Hard start on '95 525i

I've been working on a 1995 525i that consistently starts hard when it is cold. Once it's been started, you can shut it off, and it will start right back up. After it sits for longer than an hour, it has the same hard start problem.
By hard start, I mean it will crank for ~10 seconds before starting. Once it's warm, and is started back up within 5-10mins, it will start within 1-2 seconds of cranking.
Idle will also be slightly rough after starting when cold, but it clears up within 30 seconds.
I've replaced the battery, sparkplugs, and fuel filter.
Is the fuel pressure regulator, the idle air control valve or something else? Is there an easy way to check these before I buy the parts?
Thanks
Kent
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