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Old Oct 9th 2013, 03:37 AM   #11
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Originally Posted by Xbox View Post
FWIW, a BMW dealer told me that the ECU doesn't take input from O2 sensors when engine is cold, or at idle.
Correct.
The system runs open loop up to about 80-85 degrees C
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Old Oct 9th 2013, 07:41 AM   #12
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Maybe your exhaust butterfly valve is having an issue? It sounds similar to that when you manually close the valve. When I was putting on my Termi headers I played with the servo trying to remove it, and when it slapped open it sounded just like that.
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Old Oct 9th 2013, 07:50 AM   #13
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Originally Posted by Xbox View Post
Simple solution Anti ......



I reckon DNA should pony up for you
there is an alternative. loud and quiet in the making... nuff said.

i think the interferences come from the design of the headers, with the pressures building up and "colliding" at different rpms...

down low they don't need to be "synchronized" thus the weird sound?
up high, they're leveled???

maybe? just thoughts...
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Old Oct 9th 2013, 09:10 AM   #14
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Originally Posted by EvoL View Post
Maybe your exhaust butterfly valve is having an issue? It sounds similar to that when you manually close the valve. When I was putting on my Termi headers I played with the servo trying to remove it, and when it slapped open it sounded just like that.
Mine is disconnected with the servo in the bin. The spring on it is quite strong, don't think it would budge on idle*.
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Old Oct 9th 2013, 09:24 AM   #15
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Originally Posted by fireman1251 View Post
Mine is disconnected with the servo in the bin. The spring on it is quite strong, don't think it would budge on idle*.
I agree, but he's got some mileage and you never know - hence my suggestion
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Old Oct 11th 2013, 09:16 AM   #16
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Originally Posted by fireman1251 View Post
Very true!

Either that or you do what I did to "fix" the smoke issue: Only start your engine once you're seated and plop it in gear and ride off immediately. That idling business is not good anyways.
I never warm the bike up at idle, except for that video, which I made to test whether or not it would happen just idling (normally it happens after a long ride). Throttle bodies were reset, gear indicator was reset, exhaust is new.

I've never changed my plugs, but the dealer did during the 15k service (I would hope!).

I'll be disconnecting the servo next, but I've never had issues with it and it runs through it's servo sounds perfectly each time I turn the ignition. Never know....

Last edited by AntiHero; Oct 11th 2013 at 09:39 AM.
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Old Nov 18th 2013, 07:55 PM   #17
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Originally Posted by Xbox View Post
FWIW, a BMW dealer told me that the ECU doesn't take input from O2 sensors when engine is cold, or at idle.
Agreed, but his problem comes after some riding ,thereafter the idling is high with some misfire...

I would assume the O2 sensor (with the inbuilt heater (4 wire) ) is already up and running with close-loop...

This happens to my bike too, as some has said, a little rich with post ignition in the exhaust.

maybe run your finger around the exhaust exit (at cold!!),to check for soot built-up...?
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Old Nov 20th 2018, 01:28 PM   #18
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Did you happen to fix this issue? My bike is has the same symptoms. When I am on throttle the bike sounds and runs great, when when I am at a stop light the RPM drops slowly until it dies.
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