erratic idle - BMW Luxury Touring Community
 
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post #1 of 8 Old Oct 1st, 2011, 5:21 pm Thread Starter
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erratic idle

hello, I have a 2000 Lt with 14,000 miles. It has an erratic idle and sometimes stalls at a redlight. I ran seafoam through it and no improvement. I removed the breather box and noticed a hose clamp very loose on 2 of the boots between the breather box and the intake openings of the throttle bodies. I also noticed a lot of oily residue around one of the bodies. Can a loose air cleaner boot cause an erratic idle and stalling? The bike has had a cannisterectomy. All 4 of the lines running from the throttle bodies to where the cannister used to be are in good shape with no leaks. Thanks for the help. Byrdman
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post #2 of 8 Old Oct 1st, 2011, 6:53 pm
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Re: erratic idle

Quote:
Originally Posted by byrdman
All 4 of the lines running from the throttle bodies to where the cannister used to be are in good shape with no leaks.
??? You may have a vacuum leak. IIRC, you should just need to block these off on the carb (or what ever you want to call it)

Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
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post #3 of 8 Old Oct 1st, 2011, 9:38 pm
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Re: erratic idle

Quote:
Originally Posted by byrdman
I also noticed a lot of oily residue around one of the bodies.
This suggests the crankcase breather line behind the throttle bodies may be cracked open -- that would allow oil to make a mess, and create a vacuum leak.

A pita to get to to fix. However, before taking the bike apart to see whether this is the problem, you may be able to see whether the hose cracked by looking in with a flashlight from the front of the bike, past the suspension to the area above the engine block and below the frame backbone.

Mark Neblett
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post #4 of 8 Old Oct 1st, 2011, 10:17 pm Thread Starter
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Re: erratic idle

Thank you Mark and Hoss. I will check both of these on Sunday and post my findings. I will add that I also observed that the throttle body located at the front of the engine was the one covered with the oily residue and the butterfly in it was dirty along with the interior wall of the body itself. Also, the bike runs well except for idle and sometimes it idles ok for a few minutes
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post #5 of 8 Old Oct 1st, 2011, 10:53 pm
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Re: erratic idle

Quote:
Originally Posted by mneblett
This suggests the crankcase breather line behind the throttle bodies may be cracked open -- that would allow oil to make a mess, and create a vacuum leak.
If it is the breather... a mess is an understatement... A flashlight from the front will give you a view of the top of the engine...

it will look like this...

Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
'05- K1200LT - Gretchen
R.I.P. - '00- K1200LTE- "Barbara" - Retired at 168K 9/2011
MOA, IBA, EXR & RCB and TMI
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post #6 of 8 Old Oct 1st, 2011, 10:59 pm
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Re: erratic idle

Quote:
Originally Posted by mneblett
This suggests the crankcase breather line behind the throttle bodies may be cracked open -- that would allow oil to make a mess, and create a vacuum leak.
If it is the breather... a mess is an understatement... A flashlight from the front will give you a view of the top of the engine...

it will look like this...

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Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
'05- K1200LT - Gretchen
R.I.P. - '00- K1200LTE- "Barbara" - Retired at 168K 9/2011
MOA, IBA, EXR & RCB and TMI
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post #7 of 8 Old Oct 2nd, 2011, 7:31 pm Thread Starter
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Re: erratic idle

Update: It is Sunday pm and I am starting to put the bike back together. I inspected the vent tube on top of the engine between the engine and the frame and it is in good shape with no leaks. The only problem I could see was the loose boot and dirty throttle body. Got everything clamped down and cleaned up. I plan on having it back together and testing it out on Monday. Thanks Hoss for the photos they were a great help .
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post #8 of 8 Old Oct 6th, 2011, 9:19 pm Thread Starter
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Re: erratic idle

Finally got it all back together and went for a test ride. Idles very well, in fact better than it has in a long time. Not sure what fixed it. All I did was spray carb cleaner into the throttle bodies and wiped them out best I could I also cleaned them on the outside including all moving parts such as linkage and pivot points on the butterflies. I also made sure I fastened all hose clamps down good and tight to prevent air from being pulled in from around the bodies. Thanks again for the advice, it is well appreciated. Something about fixing your own bike and saving a lot of bucks makes it ride so much better .
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