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-   -   650i 06 idling too low (http://www.bimmerfest.com/forums/showthread.php?t=659090)

HULKED 11-19-2012 10:08 AM

650i 06 idling too low
 
Hi
I'm having an idling issue on my car......on cold start up it idles at 1100 rpm for @ a minute or 2, then drops down to 700 rpm for @ 4 minutes which at this stage it has a smooth & equal idle from the exhaust, after this it drops down to 550 rpm - rough idle & sounds like each bank has a cylinder misfire. I have done the vent valves (2 x diaphragms), check for any air leaks, had full system software updated, airflow meter (maf) has been checked,vavletronics settings been chanced from .3 to .8mm, spark plugs & coils are all good, there are no errors codes and no lights that appear on dash. Had my car by few BMW agents and they are unable to find any fault??? I have also been to a dealership that has same car as mine on sale & i done same idling test and it also started up at 1100 rpm(cold start) and when going down to the 700 rpm range.......it stayed on 700 rpm - with a smooth idle?? I'm suspecting software issue?? BTW I have been through the forum and haven't found no answers. Maybe someone can point me in the right direction, this would be appreciated.

lifezzgood 11-25-2012 08:43 AM

idling/low rpm issue
 
I sense you're more technical than I am on this but I wonder if we're having the same issue. When I run my car cold at low RPM's, for example driving slowly up a hill in my neighborhood, the car "knocks" as though it's not getting enough gas. Is this what you're experiencing?

HULKED 11-25-2012 09:32 AM

I don't have that issue, but have you had your car diagnosed to see if there's any fault codes? I ordered myself "Autocom" from China for @100usd to diagnose some other issues I had and saved me from running back & forth to dealers & saved alot of $$$. Works great with Windows 7.

lifezzgood 11-25-2012 10:00 AM

Thanks for getting back to me - I'm a mechanical idiot so I worry a bit whether or not any of the SW results will make any sense to me. :)

HULKED 11-25-2012 10:16 AM

Best bet is to start off by getting ur car diagnose to see if there's any errors. These cars are very sensitive in the sense of software related issues.

MakaveliFaison 11-25-2012 02:19 PM

May not be getting enough fuel. Clogged filter or dirty fuel rail?

davewoolley 11-27-2012 07:08 AM

What is the device you purchased?

HULKED 11-27-2012 07:15 AM

Autocom Cars Trucks & Generic

HerbP 11-27-2012 01:48 PM

If you had INPA or DIS, you could drill down in the software to help find your problems. Until you learn how to use the software, it is a bit confusing. There are many test you can run, to check to see where the problem is. The only way to learn how to use the software, is to start experimenting with it. If you think like a German, your learning curve would be accelerated a lot! Read below for more on this !

http://www.bmwcoding.com/

When the engine starts cold at 1500 RPM, the car is in the open loop mode. Once the O2 sensors & CTS have been satisfied, the engine goes into the closed loop mode. At this point all fuel & air is controlled by the ECM.

Hope this might help!

HULKED 11-27-2012 11:18 PM

I do a lot of programming on Bm's & other vehicles so it shouldn't be to difficult.I need to go thru the setting for fine tuning cos there is a imbalance between the two banks,so some specs would be appreciated.

Thanx Fred.

SFbay 11-27-2012 11:22 PM

Its a high chance you've got oil in your spark plug pipes

HULKED 11-27-2012 11:24 PM

Thanx they clean.


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