Troubleshooting quiz for experienced LT riders - BMW Luxury Touring Community
 
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post #1 of 8 Old Feb 15th, 2011, 8:19 pm Thread Starter
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Troubleshooting quiz for experienced LT riders

I've had my 2002 LT for about six months now and it's just developed a starting problem I hope folks can guide me into searching for the culprit. Here's the background to help -
Bike has about 20K miles on it and I did recently did most of the items called out in the 24K maintenance schedule (ie new fuel and air filter, spark plugs, oil change) - along with installing a new Odyssey 680 battery. After this major work - the bike started up just like normal and ran well. A few days later we rode it for almost a 2 hour ride with no issues. About two weeks later I connected my new Odyssey charger to the lower-left powerport to insure the battery was fully charged - then the next day in starting the bike, it would turn over fine but it wouldn't startup like always before (ie I would always just push the starter button, no throttle, and it would idle) - the only way I could get it to keep running was to give it some throttle and keep babying it until it warmed up - then we rode it again for about an hour and it seemed fine. Tonight (about 4 days later) - I rechecked and unfortunately it again exhibits the same problem (ie won't just start up without some throttle playing) - again, this bike never had a starting issue so it seems something happened suddenly that I'm not sure where to start. Seen several possible issues in this forum but since I'm pretty new to the LT, I could sure use some expert advise. thank you!

Chuck
Jacksonville, FL
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post #2 of 8 Old Feb 16th, 2011, 3:42 am
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Re: Troubleshooting quiz for experienced LT riders

You might try remapping your throttle. Do a search you should find the directions to make sure mine are correct.

Disconnect the battery for at least 10 minutes.
Connect the battery, turn key one( do not start the bike)
Open the throttle all the way and then close it three times.
Turn key off.

This may fix the problem.

Bob Brendel
05 LT, Light Metallic Yellow
99 LT, Totaled 3/09
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post #3 of 8 Old Feb 16th, 2011, 4:49 am
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Re: Troubleshooting quiz for experienced LT riders

When you say you have to play with the throttle, can you just hold it at idle speed once the engine starts and keep the engine running?

If so, you may have a throttle positioner problem. It is a small electric stepper motor that controls the idle speed. It is at the rear of the throttle rail, and positions the throttle for idle. If it is going bad, idle control will be lost, and the engine will not keep running with it at it's normal engine off position.

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post #4 of 8 Old Feb 16th, 2011, 6:05 am Thread Starter
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Re: Troubleshooting quiz for experienced LT riders

Thanks to both Bob and George for your replies - it seems both of you are leaning towards TPS issues. To answer George's question - by "playing with the throttle" - I meant I have to keep the throttle held a bit open to even get the bike to start cold and then it will not stay running unless I continue to hold the throttle open to allow it to get warm and then it will idle on it's own. Once it was ridden and warm, it would start without any hand on the throttle and idle fine. That's why I wasn't sure if the TPS being either out of "calibration" or just plain bad would allow the engine to improve once it's warm.

Chuck
Jacksonville, FL
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post #5 of 8 Old Feb 16th, 2011, 6:07 am Thread Starter
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Re: Troubleshooting quiz for experienced LT riders

sorry David - didn't mean to call you George!

Chuck
Jacksonville, FL
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post #6 of 8 Old Feb 16th, 2011, 4:47 pm Thread Starter
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Re: Troubleshooting quiz for experienced LT riders

Final update as the problem has been "solved". Not sure what caused the issue in the first place but unplugging the battery and trying it again seemed to reset things and the bike starts normally again. Thanks again for the input!

Chuck
Jacksonville, FL
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post #7 of 8 Old Feb 16th, 2011, 5:27 pm
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Re: Troubleshooting quiz for experienced LT riders

I've disconnected my battery numerous times and have never had to reset the throttle. I've read these threads and always wondered why some had to and others like myself didn't?

Dano
Tampa, Fl.

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post #8 of 8 Old Feb 16th, 2011, 6:21 pm
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Re: Troubleshooting quiz for experienced LT riders

Quote:
Originally Posted by DanDiver
I've disconnected my battery numerous times and have never had to reset the throttle. I've read these threads and always wondered why some had to and others like myself didn't?


I don't believe the re-setting of the TPS (open twice close twice key off) is necessary (but agree beneficial) but the re-set (memory erase) of the ECU is. I forgot to do the TPS after my clutch job (battery off for one week) and never had an issue on initial startup. Even my 96 Lincoln MK VIII has required an ECU purge once just to get her to start.

John
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Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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