1999 K1200LT hesitation, codes 4400 + 368 in memory

[BruceinLA]

I bought the 911 to diagnose a bad hesitation in the beast.  I have two codes in memory:

4400: Lambda-Control, Upper control limit reached
368: Lambda-Control, Upper Adaptation limit reached

I will ride the bike over the weekend to see if the codes come back after I cleared them.

Has anybody seen / repaired a Light Truck with these codes?

[Haakon]

Its unlegal to suggest this: (US regulations..)
Try disconect your Lambda and see if the hesitation stop.
I guess your Lambda is not working properly any more.
I never had those fault codes so can not say for sure..
From MY experience Lambda sensors often have a limited life expectansy :-(
(Have had 3- now riding without.)
If you want to exchange it they can be bought cheaper than what BMW charge you.
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"Has anybody seen / repaired a Light Truck with these codes?"
 

[BruceinLA]

just a follow up, the codes were caused by a split fuel hose in the fuel tank.  new hoses and filter, clear codes, test ride 50 miles, all ok, no codes.

the low fuel pressure made it impossible for the motronic to achieve "lambda" ... all o.k. now.

B

[kobus]

Thanks for the follow up Bruce.

Just for interest sake, you can have a look at how the Lambda control adjusts (with the Lambda plot screen) by squeezing the fuel supply line and watch how the control goes up to the upper limit as the system leans out and tries to correct it.
Nifty trick to see if your Lambda sensors/control loop  are working a-OK.

[BruceinLA]

I used the O2 sensor graph to make sure that was good and active... good tip on the Lambda, thanks.

It is very handy to have the GS911 available to make accurate diagnosis possible on my bikes.

So many internet forums have drive ability questions answered with "unplug this" or "unplug that" and it will run like a champ!

If I ask most people who tinker "what is closed loop?" I get a blank stare.   Yet they will be happy to tell you what you don't need connected!

I am a trained auto mechanic, unlimited smog license, ASE master technician, Nissan master technician.... lots of diagnostic time.

My  high school auto shop teacher said something that has always stuck with me "stock is hip", high performance is not needed, and if it does
not run / function properly it just needs to be repaired properly... not modified to "hide" the real problem.

[BC K1200R]

Bruce

Well done on the diagnosis and repair!  I agree with you.  Too many people do NOT understand how the system works and what each sensor does.  Its easy to remove something if you dont know anything about it.

I just ordered a GS-911 for my reciently purchased 07 K1200R.  Ive worked on electronic fuel injection systems since 1980.  Its interesting how they have evloved from the days of electronically controlled carborators with single wire O2 sensors to the efficient and complex modern systems.

Bill