accelerator stayed high

[NeverRodeBefore]

Just a thought

Had to take the battery of my 12 (it had gone flat) and whilst reading the manual for clues, I found that when you reconnect, you have to cycle the throttle a couple of times so that the brain works out the travel, then you can start the bike and ride...

Is it possible then that by not waiting for the normal start up, the brain has been confused, and then reset when you turned the bike on and off again?

I should have stuck to Landies... it only had two fuses when I got it.... it has 8 now... some off them are actually connected to things too

 

[Cookson]

The cable opens the throttles and turns the potentiometer - the potentiometer then reports the amount of throttle opening to the electronic management system. What this means is that the rider physically opens the throttles, but the engine management system can work out how much fuel to inject. Well that's my theory anyway!!

Correct.

 

[Cookson]

Also meant to say.

Does'nt help or solve the problem tho.


I would have said it was the cable sticking but strange it would reset itself by turning ignition off & on, unless you moved the throttle twist grip while the ignition was off & that freed the sticky cable.

 

[Engineer]

Correct.

Thank you

 

[minkyhead]

This morning I started my 1200GS (without waiting for the pre-check, I never do) and the engine was "graspy". At the first stop I noticed that the accelerator stayed high, no way to reduce the revs.
It continued like that for a few hundred meters than I stopped and switched the engine off.
Pre-check was ok and since then no problem at all?
Any similar experience? what explanation?

hope its not this ...
http://www.ukgser.com/forums/showthread.php?t=62976

 

[gsSpike]

Chasr's report that this can be heated grip related rings true. I went out today (cold) for a "quick" 300 mile lap of Wales. The throttle felt a little "shunty" rolling on and off - then I noticed no spring return on the throttle - it would close if you wound it off. I found that within 30 seconds of turning the heated grips on, the throttle would start to bind, if I took my hand off, the windblast cooled the grip, and the throttle would then close after 20 seconds or so. I amused myself with this "cruise control" feature for an hour or so - 100% correlation - heat on, throttle stuck, heat off, throttle OK. Anyone got a fix though? Mine is >20K miles and out of warranty.....

 

[Pukmeister]

I had exactly the same problem with my BMW heated grips (which I fitted myself last year using BMW parts and got the dealer to "software enable" - Doh !!).

When used and hot, the throttle grip expanded lengthways and rubbed against the bar end weight preventing the throttle from closing under its spring action. It took me longer to investigate the cause than to sort it !!

To remedy it, it takes 10 minutes if you have Torx tools:

1) Remove the RH handguard, remove the rear cover on the RH switchgear.

2) Slacken the clamping screw which holds the clamp band for the RH switchgear and throttle handle.

3) Move the switchgear a couple of millimetres further down the handlebars and retighten in the new position. Ensure throttle has some side to side 'float'.

4) Re-assembly is the reverse of the above.

Test heated grips and throttle on an empty stretch of road and be ready just in case throttle sticks.

No more tightening throttle action as the heated grips expand - result !!

 

[The Nutter]

This morning I started my 1200GS (without waiting for the pre-check, I never do) and the engine was "graspy". At the first stop I noticed that the accelerator stayed high, no way to reduce the revs.
It continued like that for a few hundred meters than I stopped and switched the engine off.
Pre-check was ok and since then no problem at all?
Any similar experience? what explanation?

I had the same thing happen to mine last summer after stopping for a ciggie break. On top of the high revving tickover the bike would lurch quite violently on a steady throttle. I too stopped, switched off and started the bike again, allowing it to go through it's full start up cycle. Problem cured.

 

[cookie]

sounds like it was the ECU having a blonde moment to me.




BTW fly by wire is old hat. my 94 VW TDI has it.

 

[Pukmeister]

I take it that'll be a Yellow GS then ??

 

[gsSpike]

Thanks Pukemeister - sounds like a better fix than the packing washer on the end weight. Yes - mine is a yellow 04 GS - if you were asking.