Rough Idle - 2005 LT - BMW Luxury Touring Community
 
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post #1 of 12 Old Oct 13th, 2006, 4:09 pm Thread Starter
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Rough Idle - 2005 LT

I got my bike back from the dealer for a 12k service. The bike is rough at idle even at operating temp. At stops the tach needles bounces and the handlebars shake like a Harley. It was rough before the service as well. The canisters have been removed. Is this the way the bike is supposed to be?

Jim in Dublin, OH

2005 - LT Ocean Blue (Catuffalo - Part Cat / Part Buffalo)
2002 - Moto Guzzi Cal Spec Sport
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post #2 of 12 Old Oct 13th, 2006, 4:33 pm
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You stated it was rough BEFORE the service! LTs aren't rough. It could be a bad spark wire, a vacuum hose or throttle body connection. The dealer should have found any problem that existed while they were in there. Unless, of course, THEY caused this one... wouldn't be the first time.

Did you mention to them the roughness?

Did they read the Modec codes looking for faults?

J. Averill Townsend
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post #3 of 12 Old Oct 14th, 2006, 2:22 am
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If it was running rough before the service, then you should have mentioned it so they could have looked for the problem. Most probably a vacuum leak near the throttle bodies.

BTW, you did plug the vacuum hose after removing the canister, right?

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post #4 of 12 Old Oct 14th, 2006, 4:03 pm
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My 99 had the same rough idle.I found the problem after I changed the clutch. The throttle position senor was loose. The paint was still on the little allen bolts, but I could turn them with my fingers. An allen wrench and some lock tight fix the shake.
Don
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post #5 of 12 Old Oct 14th, 2006, 7:58 pm
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My 2005 ran rough and I asked the dealer, the tech claimed it was normal. I wasn't impressed and didn't really beleive him. The idle was running up and down hunting as if it had a leak.

Just had the clutch cylinder leak and a new clutch under warranty. This bike has been a disappointment and it still hasn't been reassebled properly.

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post #6 of 12 Old Oct 16th, 2006, 8:26 am Thread Starter
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It ran rough before the canister removal, yes the vac hose was plugged and yes I told the dealer prior to the 12k service.
Jim

Jim in Dublin, OH

2005 - LT Ocean Blue (Catuffalo - Part Cat / Part Buffalo)
2002 - Moto Guzzi Cal Spec Sport
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post #7 of 12 Old Oct 16th, 2006, 5:28 pm
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Question

Jim.
Have you had any clutch done?
Don
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post #8 of 12 Old Oct 17th, 2006, 12:22 pm Thread Starter
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No - I have not had the clutch done. The clutch has not been a problem. Why would the clutch cause the bike to idel rough?
Jim

Jim in Dublin, OH

2005 - LT Ocean Blue (Catuffalo - Part Cat / Part Buffalo)
2002 - Moto Guzzi Cal Spec Sport
2000 - Moto Guzzi V11 Sport
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post #9 of 12 Old Oct 17th, 2006, 5:20 pm
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It is not the clutch that would be the problem. When I removed the transmission to get to the clutch, I found that the air silencers had pulled loose. That created an air leak. Not too hard to fix though.I used a tack pulling screw driver to force the boots back down. That fixed the leak.
If you had ANY work done that would require the cross-over mount to the transmission to be removed, this is where you want to look. Not too hard to see, you only have to remove the engine lowers and use a good flashlight.


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post #10 of 12 Old Oct 18th, 2006, 6:25 am
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Quote:
Originally Posted by jsciullo
I got my bike back from the dealer for a 12k service. The bike is rough at idle even at operating temp. At stops the tach needles bounces and the handlebars shake like a Harley. It was rough before the service as well. The canisters have been removed. Is this the way the bike is supposed to be?
When you say the tach needle bounces, do you mean random, high speed "flutter", or do you mean rising/falling every couple seconds or so? If the latter, it is probably a specific vacuum leak: Each of the four throttle bodies has a vacuum hose attached (the charcoal canister hose splits into 4 hoses downstream of the purge solenoid). It's real easy to knock off one of these hoses during work without noticing it, and occassionally one will come off by itself. When this happens, the closed-loop engine electronics "hunts" -- it sees a lean condition (from one cylinder), richens the mixture, which causes the idle to rise, which is turned back down by the electronics to the target idle speed, which results in the O2 sensor seeing a lean condition from the vacuum leak again, restarting the cycle. The idle will go up and down between ~1000-~1800 rpm.

Mark Neblett
Fairfax, VA
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post #11 of 12 Old Oct 18th, 2006, 11:49 am Thread Starter
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Its not a high speed flutter... more like a slower movement every sec or so. How much crap has to come off to see if a vac hose got knocked off?
Jim

Jim in Dublin, OH

2005 - LT Ocean Blue (Catuffalo - Part Cat / Part Buffalo)
2002 - Moto Guzzi Cal Spec Sport
2000 - Moto Guzzi V11 Sport
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post #12 of 12 Old Oct 18th, 2006, 1:37 pm
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Quote:
Originally Posted by jsciullo
Its not a high speed flutter... more like a slower movement every sec or so. How much crap has to come off to see if a vac hose got knocked off?
Jim
It does sound like a loose hose. If you know where the hose stub tubes are on the throttle bodies, you can remove the left upper side panel and left fan shroud, then use a flashlight and long-nose pliers to reach the hose ends -- but it's a pita. Much easier to pull the fuel tank (both upper side panels, radio stingray, seat frame, tank).

Mark Neblett
Fairfax, VA
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