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Old 08-22-2012, 03:24 PM   #1
freyke OP
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Question 2011 R1200GS Rough Idle

My 2011 R1200GS with almost 15,000 miles on has suddenly started to idle roughly when warm. Still runs great when rolling on the throttle. Also idles like a champ when first starting up. Had the 12,000 mile service done at the dealer about a month and a half ago. No faults or check engine lights on the dash. Problem didn't start to surface until about a week ago.

Any thoughts.
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Old 08-22-2012, 04:01 PM   #2
stickman1432
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Try a throttle sync should fix the problem..............either twin max or a Harminozer.........
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Old 08-22-2012, 05:14 PM   #3
erkmania
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You might try removing the small hose going to the left throttle body and capping the hose fitting off. There might be some fuel leaking from the carbon canister into that cylinder. Overfilling the tank may cause this.

This is just to help you diagnose the problem. The carbon canister valve is not usually open at idle.
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Old 08-29-2012, 08:19 AM   #4
freyke OP
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Laugh Thanks Adventure BMW - Fixed

Rough idle issue is fixed (under warranty) thanks to the folks at Adventure BMW in Chesapeake, VA.

Guided diagnostics found the Secondary Air Solenoid to be inoperative. Apparently this was caused by a bad Fuel Tank Breather Valve (PN 13901433603) which was replaced along with a new Activated Charcoal Filter (Part Number: 16131464924).

All good now; smooth as glass at idle.
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Old 08-30-2012, 12:28 AM   #5
billdonna
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Quote:
Originally Posted by stickman1432 View Post
Try a throttle sync should fix the problem..............either twin max or a Harminozer.........
I don't think so. On a 2011 GS at idle, the throttle bodies should not be affected by the cables, which a throttle sync with the Twin Max sets. They are sitting on the throttle body stops. The only way to calibrate the stops is with a GS-911 or at the dealer.
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Old 09-10-2013, 04:22 AM   #6
smokeeater495
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I overfilled my 2011 R1200GS this morning. I watched about half an ounce of fuel go down the overflow around the tank bung. Pulled out of the station and directly onto the interstate. Had a momentary bog while accelerating, lasted 5 or 10 seconds. It felt like the engine went way too rich. Ran fine the rest of the trip. Is the key just to not overfill or is there a fix?
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