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  #1  
Old 10-20-2019, 07:54 PM
SROC2 SROC2 is offline
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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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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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  #4  
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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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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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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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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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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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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  #10  
Old 02-20-2020, 11:27 PM
SROC2 SROC2 is offline
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Update.

It's been a few months since my last post. What an adventure. Issue remains no change after the following was done. Still open to suggestions as dealer and a reputable Bmw tech could not resolve the issue. When AC is on the idle usually occurs when car has cooled down for more than hour. Does not occur when car is hot. Most of the replacement work was done by me as I had the parts on hand for general maintenance work.

Replaced:

Idle DME software update done
New battery
Voltage drain in case of system voltage anomalies.
Throttle valve software start and stop reset
Vanos solenoids
New MAPs on charge pipe and intake manifold.
New EGR
new boost solenoid
Newer throttle body
New GFB diverter valve
No vacuum or air leaks
No codes

Idle looks like this


Last edited by SROC2; 02-20-2020 at 11:31 PM. Reason: Wrong vid
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  #11  
Old 02-21-2020, 03:03 AM
Doug Huffman's Avatar
Doug Huffman Doug Huffman is offline
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^^^^ Somebody's favorite cash cow!

WTF does this mean, " Voltage drain in case of system voltage anomalies."?

BMW's particularly E70 add 200 RPM as needed At idle to account for alternator load.
Quote:
Originally Posted by E70 Energy Management page 6
Despite the alternator operating at maximum,
on gasoline engine vehicles the idle speed is
increased by up to 200 rpm as soon as
current is drawn from the battery
__________________
Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.

Last edited by Doug Huffman; 02-21-2020 at 03:14 AM.
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  #12  
Old 02-21-2020, 08:16 AM
SROC2 SROC2 is offline
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Quote:
Originally Posted by Doug Huffman View Post
^^^^ Somebody's favorite cash cow!

WTF does this mean, " Voltage drain in case of system voltage anomalies."?

BMW's particularly E70 add 200 RPM as needed At idle to account for alternator load.
Ha! Yes...it's been fun though learning and doing most of the work myself.

One indy tech did something with the battery to drain all standing power within the vehicles system. He figured maybe there was a voltage glitch somewhere which affected the system that caused the weird idle. Didn't help anyway.

Ok on alternator but system is charging well, no issues. It is something loading the system at a vehicle specific engine temp...really odd because it doesn't happen when engine is hot. So slightly warm engine + AC on = this issue. Thanks Doug

Last edited by SROC2; 02-21-2020 at 08:18 AM.
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