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  #1  
Old 10-20-2019, 07:54 PM
SROC2 SROC2 is offline
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Location: San francisco
 
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Mein Auto: 2012 X5 35i
Pulling idle on secondary cold start?

Hi, I have a 2012 35i and have recently been experiencing a weird pulsing idle after drinking the car for 20-25 minutes after a cold start? Seems to happen all the time now. No check engine light or codes thrown. It settles down after 20 seconds. I checked and cleaned MAF and MAP connections, air box etc. no change.

Items done, I remove my RaceChip piggy back then tuned with a Dinan flash. Dinan could not find any issues and we even tested with the car reflsahed back to stock as we thought maybe itís the tune. Still happened. Iíve driven the car for 40k miles with RaceChip and have never experienced this issue. Only happened after I removed it which is odd.

I do have n existing evap,leak for the airconditiner, nothing else going on. Thanks for any input if ny have experienced it.
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  #2  
Old 10-20-2019, 08:05 PM
robinasu robinasu is offline
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Vacuum Leak

Especially with German cars, I always check for vacuum leaks, first.
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  #3  
Old 10-20-2019, 08:40 PM
SROC2 SROC2 is offline
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Mein Auto: 2012 X5 35i
Quote:
Originally Posted by robinasu View Post
Especially with German cars, I always check for vacuum leaks, first.
Thank you..Ok will review that. I remember hearing a somewhat of a cracking sound from the engine compartment the very first drive home from Dinan. Figured maybe I ran over something. Didnít see the weird pulling idle until a secondary cold start up the next morning. Any recommendations on a first spot to look at? Thanks
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Old 10-20-2019, 09:07 PM
robinasu robinasu is offline
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I would check around any work they did under the hood. Maybe check around any intake pressure sensors / flow devices, but that is a complete guess. I just bought a cheap EVAP smoke machine on Amazon to ferret out a potential EGR problem:

https://www.amazon.com/AutoLine-Pro-...DW7QYAGVMJNR4M
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  #5  
Old 10-20-2019, 09:24 PM
SROC2 SROC2 is offline
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Location: San francisco
 
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Mein Auto: 2012 X5 35i
Quote:
Originally Posted by robinasu View Post
I would check around any work they did under the hood. Maybe check around any intake pressure sensors / flow devices, but that is a complete guess. I just bought a cheap EVAP smoke machine on Amazon to ferret out a potential EGR problem:

https://www.amazon.com/AutoLine-Pro-...DW7QYAGVMJNR4M
Got it will review it. Thanks for replies
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  #6  
Old 11-10-2019, 01:12 PM
SROC2 SROC2 is offline
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Location: San francisco
 
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Mein Auto: 2012 X5 35i
Ok so pulsing idle still occurs. No leaks anywhere. I noticed it only occurs when AC is on while doing a second cold start up. First cold start fine. Seems to be AC load on system but doesn't happen on first start only restarting after driving car for a short distance and allowing the car to cool and doing a second start.

AC compressor issue. belt?
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  #7  
Old 11-20-2019, 10:16 AM
Tomcat05 Tomcat05 is offline
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Mein Auto: 2013 X5 E70 x35i
I had a goofy cold start idle which had the 35i surging or lunging coming from a stop. This happened with a cold engine and resolved itself in the first minute, or so. Car has a 100k miles on it.

Replaced both Oxygen sensors and all is good now.

Maybe this is causing your problem. Good Luck.
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  #8  
Old 11-20-2019, 12:46 PM
SROC2 SROC2 is offline
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Location: San francisco
 
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Mein Auto: 2012 X5 35i
Quote:
Originally Posted by Tomcat05 View Post
I had a goofy cold start idle which had the 35i surging or lunging coming from a stop. This happened with a cold engine and resolved itself in the first minute, or so. Car has a 100k miles on it.

Replaced both Oxygen sensors and all is good now.

Maybe this is causing your problem. Good Luck.
Ok I will look into that. I do smell an exhaust leak smell directly under the car. Not typical exhaust smell so its possible something is loose under there. Could also be oil pan which they said has a small leak. I will also review the 02 sensors to be sure. I don't have any codes at all. BMW tech did notice low voltage codes but didn't say anything further on it. Thanks for your input. Greatly appreciated
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  #9  
Old 11-28-2019, 05:23 PM
SROC2 SROC2 is offline
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Mein Auto: 2012 X5 35i
Update

Ok so vacuum check was clear, throttle and manifold maps were cleaned, new battery replaced (about time), ac compressor fine, all DME updates were completed. The pulsing idle still persists when warm and car is in open loop. Seems to be electrical but I am not getting any faults. Only items I have not replaced or cleaned yet are the MAF and vanos.

I am wondering if my RaceChip Pro box removal caused an electrical issue or damaged a component. I had it on for 40k miles and removed it. Issue starting happening right after.
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