Low idle speed after clutch replacement - BMW Luxury Touring Community
 
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post #1 of 9 Old Jul 21st, 2012, 9:30 am Thread Starter
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Low idle speed after clutch replacement

Just completed reassembly of my 2005 LT after installing a new clutch. Everything when well and the bike runs great except the idel speed is very low and the bike will stall after a few seconds of slow idle. I did not remove the fuel rails, thottle bodies or any of the throttle cables during the clutch replacement. Any ideas before I remove the tank and take a look at the trottle assembly? BTW I did the throttle position sensor reset ( ingnition on without engine running, full throttle 3-4 times ingintion off) at did not see any change in the idle speed.

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post #2 of 9 Old Jul 21st, 2012, 9:49 am
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Re: Low idle speed after clutch replacement

I ran a scan on low idle speed since I remember seeing this problem quite a few times in the past.

Huuuum. Come to think of it there was a fellow over seas that had a heck of a time curing his bike. I seem to remember he did a total rebuild of his LT.

One thing that came up in the past was the gas tank pinching a line, ANd of course the canister. If yours is still there this is a link on it's removal:
http://www.bmwlt.com/ubbthreads/show...&sb=5&o=0&vc=1

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post #3 of 9 Old Jul 21st, 2012, 11:57 am Thread Starter
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Re: Low idle speed after clutch replacement

I removed the canister several years ago. The bike runs fine at all speeds and does not seem to have any problem other than the low rpm idle. If a throttle cable was pinched or cramped I would think that would prevent the throttle from closing all the way or opening all the way but would not reduce the idle speed, but I could be wrong, I have been a couple of times.

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post #4 of 9 Old Jul 21st, 2012, 12:18 pm
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Re: Low idle speed after clutch replacement

I had a similar situation one time, and after jumping through hoops to try and figure it out, I replaced the battery....problem solved. Just an idea, not the only solution....

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post #5 of 9 Old Jul 21st, 2012, 12:43 pm
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Re: Low idle speed after clutch replacement

OOps.. You tried that... You might try disconnecting the battery for half an hour.. Getting a good charge on it.. Then when you reconnect the battery, Reset the TPS again...You need to roll it off all the way to the stop.. If you just let the throttle go.. It actually stops turning before it's fully at it's travel limit...So roll that sucker till it won't turn no mo...

Try that..

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Last edited by JPSpen; Jul 21st, 2012 at 12:49 pm.
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post #6 of 9 Old Jul 21st, 2012, 2:12 pm
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Re: Low idle speed after clutch replacement

When you raised the rear frame to tilt the engine and transmission for transmission removal, did the rubber "boots" (do not know the correct name) come off the tops of the injector area? Mine did.

Loosen the clamps at the bottom of the boots, and push boots back up (mine came off at top) or down as appropriate to get them back on nice and snug. If you have an air gap there, will probably run like crap at low idle.

FWIW, separation was greatest at rearmost cylinder, as one might expect due to the tilt angle.

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post #7 of 9 Old Jul 21st, 2012, 2:16 pm
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Re: Low idle speed after clutch replacement

I had the same problem as Tony. Easy fix though.
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post #8 of 9 Old Jul 21st, 2012, 9:59 pm
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Re: Low idle speed after clutch replacement

Another possibility is that the throttle positioner became disconnected. That is the little stepper motor drive on the rear of the throttle rail that controls idle speed. The Motronic ECU controls idle speed with that motor.

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post #9 of 9 Old Jul 22nd, 2012, 12:55 pm Thread Starter
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Re: Low idle speed after clutch replacement

I took the tank back off to inspect and the throttle position sensor is connected as are the boots to the air filter box. I did the TPS reset again and the idle is slightly higher but is still to low to keep the engine running after 5-10 seconds without turning the throttle grip.

'05 K1200LT
'92 FXSTC
'66 HD Sprint
IBA #375

"Eat, Drink and be Merry for tomorrow we Ride"
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