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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 11-22-2011, 10:43 AM
EURO540M EURO540M is offline
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e39 rough idle on cold start

I recently started experiencing rough idle on cold start. Once the engine warms up it goes away. What can cause that?
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  #2  
Old 11-22-2011, 11:27 AM
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Josh P. Josh P. is offline
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Vanos, idler pulley, oil separator.
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  #3  
Old 11-22-2011, 11:28 AM
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mpower997 mpower997 is offline
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I just recently had the same problem, turns out I had a vacuum leak at the intake manifold/throttlebody
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Old 11-22-2011, 11:39 AM
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Very likely a vacuum leak somewhere. Either the CCV, throttle body or intake manifold gaskets.
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  #5  
Old 11-22-2011, 12:07 PM
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Josh P. Josh P. is offline
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Why would it occur only at idle if it was a vacuum leak? Not disagreeing, just wondering.
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  #6  
Old 11-22-2011, 04:57 PM
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POof540i POof540i is offline
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Quote:
Originally Posted by Josh P. View Post
Why would it occur only at idle if it was a vacuum leak? Not disagreeing, just wondering.
Unless I'm misinterpreting his post, I believe he's saying the car has a rough idle on cold starts. Once the car warms, the rough idle disappears. Me thinks the gaskets expand when they warm up, sealing the vacuum leak, thus normalizing the idle.
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  #7  
Old 11-22-2011, 05:52 PM
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Trebbia Trebbia is offline
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In addition to the seals changing shape suggestion, the OP may not realize the SAP system operates only when cold.

So maybe the SAP system is haywire?

What other systems operate only when cold?
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  #8  
Old 11-22-2011, 10:47 PM
sbersenev sbersenev is offline
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Quote:
Originally Posted by POof540i View Post
Unless I'm misinterpreting his post, I believe he's saying the car has a rough idle on cold starts. Once the car warms, the rough idle disappears. Me thinks the gaskets expand when they warm up, sealing the vacuum leak, thus normalizing the idle.
I got similar. On cold start. The engine shakes a bit and rpms move up and down between 1000 and 2000. every 3 or 4 days. I need to restart the car because it shuts down on cold in the morning sometimed. What doed this mean? is this something to worry about?. if yes, how do i fix it?

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  #9  
Old 11-22-2011, 10:49 PM
sbersenev sbersenev is offline
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I think its the cadilic converter thats building up emissions. Its very expensive to do.

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  #10  
Old 11-22-2011, 11:06 PM
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Quote:
Originally Posted by sbersenev View Post
I got similar. On cold start. The engine shakes a bit and rpms move up and down between 1000 and 2000. every 3 or 4 days. I need to restart the car because it shuts down on cold in the morning sometimed. What doed this mean? is this something to worry about?. if yes, how do i fix it?

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Is your car throwing codes?
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  #11  
Old 11-25-2011, 08:33 PM
sbersenev sbersenev is offline
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cadilic converter for 2000 528i

Quote:
Originally Posted by sbersenev View Post
I got similar. On cold start. The engine shakes a bit and rpms move up and down between 1000 and 2000. every 3 or 4 days. I need to restart the car because it shuts down on cold in the morning sometimed. What doed this mean? is this something to worry about?. if yes, how do i fix it?

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Yes, I think its the cadilic converter. Anybody know how much it costs?
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  #12  
Old 11-25-2011, 09:00 PM
sbersenev sbersenev is offline
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cadilic converter

Quote:
Originally Posted by sbersenev View Post
I think its the cadilic converter thats building up emissions. Its very expensive to do.

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No Codes
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  #13  
Old 11-25-2011, 09:54 PM
jorjio_k jorjio_k is offline
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Quote:
Originally Posted by sbersenev View Post
No Codes
I am experiencing the same problems and no faults what so ever,i guess it is time to replace the oil separator coz i hear a slight whistling sound on cold starts when i accelerate,the problem is the separator or a vaccum leak.
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  #14  
Old 11-26-2011, 07:37 PM
safety glasses safety glasses is offline
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sbersenev what year is your car?
if it is a 99-2000 then it's most likely your Vanos Seals. Those cars' m52TU engines will stall in the cold at idle and run real rough until they warm up.
A new CCV (sometimes called an oil separator) will make it run a bit smoother but it will still run rough and sometimes stall at idle when the temps are at or under freezing.
I did the CCV last fall and the Vanos this spring and the car is running silky smooth in the cold now, that is how I know this
Sorry OP this may not be helpful to your 540.
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  #15  
Old 11-26-2011, 08:42 PM
bobdmac bobdmac is online now
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Quote:
Originally Posted by sbersenev View Post
I think its the cadilic converter thats building up emissions. Its very expensive to do.

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This doesn't sound like catalytic converter issues to me. First of all, you say it produced no codes. a failed converter should certainly produce a code. Second, clogged converters affect high speed power, not idle speed--at least, not that I've read about.
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