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post #1 of 8 Old Nov 18th, 2006, 8:00 pm Thread Starter
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excessive smoke

under moderate to heavy acceleration, i'm getting a lot of black smoke from my 05 lt. heavy build-up of soot around the tail pipe, also. with no decrease in oil level, i'm assuming this is most likely an air/fuel mixture ratio problem. would a PCIII eliminate this problem? are they available for the 05's? any other solution possible?


thanx
denis
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post #2 of 8 Old Nov 18th, 2006, 8:23 pm
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Quote:
Originally Posted by boocoo_dinky_dow
under moderate to heavy acceleration, i'm getting a lot of black smoke from my 05 lt. heavy build-up of soot around the tail pipe, also. with no decrease in oil level, i'm assuming this is most likely an air/fuel mixture ratio problem. would a PCIII eliminate this problem? are they available for the 05's? any other solution possible?


thanx
denis
It sounds more like a throttle position sensor issue or a oxygen sensor that has gone out to lunch. And its running full rich in limp mode. Also some BMW's dont like K&N filters as it can kill the AFM.

BobZ

99 K1200LT Burgundy (Canyon Red (new to me))
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post #3 of 8 Old Nov 18th, 2006, 10:17 pm
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Probably right on mixture rich idea.
05 still under warrenty. Have the dealer look at it.

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post #4 of 8 Old Nov 18th, 2006, 11:53 pm
 
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Quote:
Originally Posted by boocoo_dinky_dow
under moderate to heavy acceleration, i'm getting a lot of black smoke from my 05 lt. heavy build-up of soot around the tail pipe, also. with no decrease in oil level, i'm assuming this is most likely an air/fuel mixture ratio problem. would a PCIII eliminate this problem? are they available for the 05's? any other solution possible?
Although there is a handful of LTs out there with a PCIII...DynoJet never officially released the product for the LT.

Basically, the engineers back on the mothership figured that it was better to have a bunch of unused fuel dump outta the tailpipe whilst protecting the valves, then to actually equip their bikes with a real EFI system. But I digress...

If you're concerned that something's really wrong, take it back to the dealer and have them check it out. Chances are it's just fine though.
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post #5 of 8 Old Nov 19th, 2006, 5:42 am
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Denis,
They all do that. No, seriously, every LT that I have followed, smokes like a diesel when you crack the throttle wide open.

DCH
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post #6 of 8 Old Nov 19th, 2006, 8:23 am
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Quote:
Originally Posted by boocoo_dinky_dow
under moderate to heavy acceleration, i'm getting a lot of black smoke from my 05 lt. heavy build-up of soot around the tail pipe, also. with no decrease in oil level, i'm assuming this is most likely an air/fuel mixture ratio problem. would a PCIII eliminate this problem? are they available for the 05's? any other solution possible?


thanx
denis
have you been running this bike everywhere at lower rpm's? say under 5k mostly and never run it up to say 7k?

if so, Change your plugs go run the snot out of it and clear the crap out of it , BMW does not have a full functioning EFI system like a auto. So if you are "lugging" it often and or giving it hard throttle at low rpms (IOW's to high of gear for load) it will build up carbon like you will never imagine

Tom (oh the R bikes don't do this)

Tom

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post #7 of 8 Old Nov 19th, 2006, 8:51 am Thread Starter
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thanx for the info, fellows. i feel better knowing that i don't have a unique problem. i had noticed the sooty build up on the exhaust pipe but wasn't aware of visible smoke. my son was following me through the dragon's tail a couple of weeks ago & told me it looked loke a deisel when i really romped on it. as far as driving habits, while the majority of my driving is at highway speeds of 80mph+, i seldom run it up above 5k, usually shifting around 3k. the recommendation of "running the snot out of it" reminds me of my old hopped up cb750 of the early 70's. ran bunches better when i really wrung it out occasionally. appears the LT may need the same treatment. reliable bmw dealer 100 miles away, i was hoping to avoid a visit, but i think it may be better to make an appointment & make a day trip just to be sure.

thanx again
denis
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post #8 of 8 Old Nov 19th, 2006, 11:22 am
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Quote:
Originally Posted by boocoo_dinky_dow
...while the majority of my driving is at highway speeds of 80mph+, i seldom run it up above 5k, usually shifting around 3k. the recommendation of "running the snot out of it" reminds me of my old hopped up cb750 of the early 70's. ran bunches better when i really wrung it out occasionally. appears the LT may need the same treatment...
It took me awhile to realize the LT wouldn't fly apart over 5k... but now I rarely shift below 5k and never ever run it up above the rev limiter

and yes... it runs bunches better and less/no smoke in the power band!

Warren
Chipley, FL
'05 LT - Gold
She was a fast machine, She kept her motor clean
She was the best damn woman I had ever seen -- [ac/dc]

"When you come to a fork in the road, take it."
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