[tociano]

99 K1200LTC with 120,000 miles, started missing above 75 mph (where I ride 90% of the time as I travel mainly in West US).. have cut brown wire, took charcoal canister off, still missing... recently had valve job and adjusted valves, still missing.. took to 2 BMW dealers and neither was able to figure out issue running it thru computer diagnostics and no check engine light or codes present, they reqeusted I leave bike there for some hefty hours of searching.. but trying to find out if anyone has ran into similar issue and found fix .. btw, Albuquerque BMW resealed my timing case cover as I did not do a good job of that, so they also reset static timing and they thought that would fix my problem..but it's actually worse now that bike is in perfect timing .. I have also replaced fuel and air filters, cleaned injectors, checked for vacumm leaks and found none... can ride all day long below 75 with no issues, only above that speed does it give me lots of missing.. when it misses, if you apply more throtle, it does not miss a bit and can go up to top speed without any hiccups ..

 

[mwnahas]

Check the hoses in the fuel tank that go to the fuel filter for cracks or holes. Also check the fuel filter installed in correct direction.

 

[LTOehler]

My 05 does the same thing until i shift up from 2nd gear (sorry probably no help)

 

[johnbaker15]

One of the site members had an issue like yours a week or so ago, take a look at this thread and go to reply # 15.

 

[deanwoolsey]

Yep, look carefully at the in-tank hoses. You likely have a cracked one or a loose connection. The reason it misses at higher speeds is that as your fuel consumption increases, the fuel rail loses the ability to deliver sufficient fuel pressure to the injectors. Another possibility is a leaking plug wire, but I would dive into the tank first.

 

[saddleman]

The 1999 LT's did not have a brown wire to cut. The brown wire for the different mapping was only on the 2002-2004 LT's. So which brown wire did you cut ?.

 

[tociano]

Finally confirmed what I had told 2 dealers... had to be throttle position sensor (switch as they call it).. tried to remove to open it up but alas, gotta take whole fuel rail out to get to back screw... (and I had just replaced 2 bad valves, had all that out in open).. anyhow, I just slightly adjusted it from current location and went on trip from Dallas to Amarillo then thru Oklahoma,,, not one time did it miss .... parts guy agreed with me before I messed with it,,, sensor has brushes that tend to wear out if you spend most of your time at a certain speed, loses contact and sends computer on a spin reason for hesitation... now waiting to see how long I will wait to replace it .... found Bosch OEM part on line for 159.00 .. beats dealer price of about 285.00 ... thanks everyone for suggestions...