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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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  #1  
Old 12-18-2016, 05:14 PM
Virginia Stair Virginia Stair is offline
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Location: Virginia
 
Join Date: Aug 2015
Posts: 6
Mein Auto: 2004 X-3
Rough idle on cold starts

What is the deal with most BMW's that I run across have a rough idle on cold starts and then clear up about 1 minute later, whats the cause of this and how do you resolve it?
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  #2  
Old 12-18-2016, 06:02 PM
swampX3 swampX3 is offline
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Location: New Orleans
 
Join Date: May 2013
Posts: 3,526
Mein Auto: bmw++many
older and newer engine idle control differences

the older M54 engines like what's in an 04 x3 have the issue in the video link ....idle control valve coked up

the later engines like the N52....look at/clean/swap the vanos actuators first


then ....the direct injection engines .....same as diesel injector failures .....coking at tips etc ....and that familiar diesel clack on shutdown

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Old 01-07-2017, 09:34 PM
AaronPDX AaronPDX is offline
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Location: Portland, OR
 
Join Date: Aug 2016
Posts: 5
Mein Auto: 2007 BMW X3 3.0si
Just replaced my VANOS solenoids and it was cleared my rough idle right up. This was easily the most effective 15 minute repair I've done, as the engine runs perfect even on cold startup. I had gotten the sticky VANOS solenoid code and tried to blow them out with electronic cleaner and compressed air. However, it didn't really help. They were a bit expensive at $170 each from FCP, but what isn't on our cars. If you're experiencing a surging idle on cold startup, I definitely recommend looking at these.
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