2009 R1200RT erratic idle

On yesterday's ride noticed that the engine is slow to reduce RPM when closing throttle. Also does not return to 1100RPM as it has in the past 20,000 miles I have ridden this bike. Also when idling at a traffic light the idle rpm will slowly creep up to 1500 rpm. Blipping the throttle will return the engine to 1100rpm but still creeps back up to 1500rpm.
Comparing this RT to an 1200R I rode recently, the engine does de-accelerate much slower when the throttle is closed.
The throttle cables seem to move freely so biding not happening, must be something else making the idle misbehave.
Suggestions? Thanks

It seems I have read that the routing of the throttle cables around the air filter can cause a problem....has anyone replaced an air filter lately?

Ron

With regular carburetors, I'd look for an air leak - that probably does not apply to the RTs fuel injection.

Had the tank off lately? It's easy to snag/stretch the throttle cable when putting the tank back.

Thanks for the replys , but air cleaner was changed at 12k and tank, plastic etc. was last off at 18k.
bike now has 21k miles.
I feel like it is fuel injector part going bad or some thing that sends rpm info to the throttle idle system.
Problem really just became noticeable on yesterday's 80mile. Ride.

it sounds like something a gs-911 might help with

dunno

Your idle speed is controlled by engine managment system no idle speed screws on the bike.
Cables, sensors and stepper motors plus the usual other suspets like vacuum leaks

Some of the things reported by others
Vacuum leak at throttle body
Worn butterflies (IMO not likely at low miles)
Idle stepper motor sticking
Throttle cable not properly positioned in stop at motor
Other sensors

What is not so likely is an injector- not impossible though. A first rule of mechanics is nearly everything any novice thinks is in the fuel system is actually elsewhere. Rule is accurate well over 90% of the time.

No instant answer will be obtained in this thread- you simply have to pull the plastic and check out stuff methodically

racer7 said:

Your idle speed is controlled by engine managment system no idle speed screws on the bike.
Cables, sensors and stepper motors plus the usual other suspets like vacuum leaks

Some of the things reported by others
Vacuum leak at throttle body
Worn butterflies (IMO not likely at low miles)
Idle stepper motor sticking
Throttle cable not properly positioned in stop at motor
Other sensors

Click to expand...

I agree.

What is not so likely is an injector- not impossible though. A first rule of mechanics is nearly everything any novice thinks is in the fuel system is actually elsewhere. Rule is accurate well over 90% of the time.

Click to expand...

<g> I was exposed to this Rule (showing my age here) as: Almost all carbuertor problems are electrical.

No instant answer will be obtained in this thread- you simply have to pull the plastic and check out stuff methodically

Click to expand...

Agree again.

Idle Problem solved!

After gathering many suggestions here and other places I turned to Morton's BMW in Fredericsburg , Va. and
asked Stuart Beatson, the service manager, for suggestions.
He suggested checking the vacuum hose on left Throttle body and if OK use Star Tron fuel treatment to clean the fuel system due to the numerous times that Ethanol fuel as been a cause of problems.
I used two bottles on a trip from Richmond, Va. to Canada an back last week and NO more idle issues.
I really feel lucky to have Stuart and Morton's as my local dealer. Jeff Massey, the owner, has put together a great source of support for BMW.