Brown Wire On 2005 - BMW Luxury Touring Community
 
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post #1 of 12 Old Nov 25th, 2005, 10:29 pm Thread Starter
 
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Brown Wire On 2005

I have been all over the same area where my prior 2003 LT had the brown wire exposed. Does anyone know if the brown wire has been eliminated on the 2005 or moved to another location?

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Perry Ridgway

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post #2 of 12 Old Aug 9th, 2006, 3:55 pm
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Unhappy Brown wire on 2005

I just try to find the brown wire on my 2005. and without good result. I'll be happy if somebody could help.
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post #3 of 12 Old Aug 9th, 2006, 3:59 pm
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There is no "brown wire" on the 2005 and later LTs. The Motronic was completely reprogrammed for the power upgrades made in 2005 and the mapping changed so the low speed hesitation was addressed.

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post #4 of 12 Old Aug 9th, 2006, 4:07 pm
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Brown wire on 2005 LT's

Because there is no brown wire on 2005 LT's and later model, do you anybody know how I can remove the hesitation?
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post #5 of 12 Old Aug 9th, 2006, 4:57 pm
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Quote:
Originally Posted by ojalpert
Because there is no brown wire on 2005 LT's and later model, do you anybody know how I can remove the hesitation?
What hesitation ? Certainly no hesitation on mine !
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post #6 of 12 Old Aug 9th, 2006, 6:17 pm
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Quote:
Originally Posted by ojalpert
Because there is no brown wire on 2005 LT's and later model, do you anybody know how I can remove the hesitation?
Can you describe the conditions and manner in which your bike hesitates? I have an 05 LT and haven't experienced the hesitation(s) that were present on my 99 or 02 LTs (pre brown-wire-snip).

David Taylor
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post #7 of 12 Old Aug 16th, 2006, 4:29 pm
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In the hot weather the motor knocking between rpm's 2000 -3500 and when I open little more throttle the motor "stump" and does not take more rpm's normally. It happens normally after long ride when I eg. stop to trafic lights.
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post #8 of 12 Old Aug 16th, 2006, 4:43 pm
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I'm not sure what part of the country you're in as you didn't fill in your profile,
but the first question I have to ask is are you using premium gas?

I had an 02 and experienced hesitation, cut the brown wire and it dissapeared,
now I have an 05 and there is no hesitation and when I twist the throttle between 2000 and 3500 rpm there is only....yeeehaaa.


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post #9 of 12 Old Aug 16th, 2006, 5:19 pm
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Quote:
Originally Posted by ojalpert
In the hot weather the motor knocking between rpm's 2000 -3500 and when I open little more throttle the motor "stump" and does not take more rpm's normally. It happens normally after long ride when I eg. stop to trafic lights.
What grade of gas are you running, and what brand generally? Also, what are the weather conditions when you experience this? Even if it had a brown wire to cut it wouldn't solve the problem you are describing.

David Taylor
San Jose, CA
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post #10 of 12 Old Aug 28th, 2006, 3:37 pm
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I am from Scandinavia and normally I use Shell V-power 99+ octane fuel, becasue it's working absolutely the best. I removed sparkplugs after 100 miles driving and one of them was quite "black" and other ones were normal lightgray. What are you thinking guys should it be possible that one injector not working well. Too rich mixture to one cylinder and after that Lambda loopback control tune the wrong mixture to the motor.
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post #11 of 12 Old Aug 28th, 2006, 3:57 pm
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Quote:
Originally Posted by ojalpert
I am from Scandinavia and normally I use Shell V-power 99+ octane fuel, becasue it's working absolutely the best. I removed sparkplugs after 100 miles driving and one of them was quite "black" and other ones were normal lightgray. What are you thinking guys should it be possible that one injector not working well. Too rich mixture to one cylinder and after that Lambda loopback control tune the wrong mixture to the motor.
If you have one black plug it could be a leaking injector causing that cylinder to run rich. Normally if the ECU (Motronic) was sending injection pulses that were too long at least TWO cylinders would be running rich. I am pretty sure that two injectors each are controlled by two firing pulses.

A black plug can also be caused by oil bypassing a ring or intake valve guide, but that coating will be rather shiny and "wet" looking, where a rich mixture will cause a dull "powdery" black coating.

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post #12 of 12 Old Aug 28th, 2006, 4:39 pm
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Quote:
Originally Posted by dshealey
If you have one black plug it could be a leaking injector causing that cylinder to run rich..
Same thought here.
Quote:
Originally Posted by dshealey
Normally if the ECU (Motronic) was sending injection pulses that were too long at least TWO cylinders would be running rich. I am pretty sure that two injectors each are controlled by two firing pulses.
Yep. And a defective (open too long) injector would also explain the stumbling -- if the Moronic is leaning out the mixture (in response to a "too rich" O2 sensor signal from the one cylinder's contribution to the exhaust gases), the other three cylinders would be running too lean, resulting in misfiring that would be frequent enough to feel like "stumbling." My vote's for one bad injector, too (or, less likely, a problem in the wiring harness to the injector).

Mark Neblett
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