High & Fluctuating Idle - Should I get a GS-911? - BMW Luxury Touring Community
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post #1 of 2 Old Jun 26th, 2015, 12:33 pm Thread Starter
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Location: Edgewood, KY, USA
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High & Fluctuating Idle - Should I get a GS-911?

Really two topics but one influences the other. I have been thinking of getting a GS-911 but wonder if I would get enough use out of it to make it worth it. Sure, it would be nice for brake bleed tests but that's not enough justification. Maybe the following minor issue can help me justify it in my own mind:

For quite some time I have a high idle at about 1500 RPM and occasionally (mostly when fully warmed up) the idle will surge / cycle between 1800-2000 RPM, drop to 1300-1500 RPM then climb back up about every 5 seconds. Otherwise, the bike runs fine. My mileage was averaging about 35 mpg so last winter I changed the O2 sensor which improved the mileage to 38-42 mpg but didn't influence this problem. Thinking of an air leak I checked if I properly blinded off the charcoal canister removed when I first got the bike, but that wasn't the cause.

I think it could either be the throttle position sensor, temperature sensor, vacuum hoses to the throttle body, but most likely the throttle valve actuator. Would a GS-911 help pinpoint the problem? Any ideas what it is? Like I said the problem is minor so if diagnosis involves going much deeper than Tupperware removal, then I'll probably wait until winter.

2003 BMW K1200LT (my favorite 2 wheeled land yacht)
2008 Yamaha FJR1300 (recent addition)
1982 Yamaha Vision (long gone)
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post #2 of 2 Old Jun 26th, 2015, 1:07 pm
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Re: High & Fluctuating Idle - Should I get a GS-911?

A GS-911 may help isolate this with TVA tests and TPS tests for a hardware fault. If nothing else is wrong, I am with you on the air leak. Possibly the rubbers on the throttle body or the o-ring under the TB mounting to the block. I have heard those as issues on other threads relating to idle issues. Not sure the 911 would help isolate those. I haven't had cause to use mine beyond replacing my TPS and checking the TVA it was invaluable on that task.

Sugar Hill, GA
2001 K1200LTI Champagne (current ride) Lazy Susan
1998 R1100RT Never should have sold it
1974 Yamaha TX 750 Twin. Omni Phase Balanced

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