Rough running R12S

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Great Britain
victorlaszlo
Posts: 211
Joined: Sat Mar 26, 2016 1:48 pm
Location: London

Re: Rough running R12S

Postby victorlaszlo » Fri Jul 13, 2018 3:36 pm

I don't think it has anything to do with the cables, the rubber pieces are in good condition and no visible cracks anywhere. Also there is good play in the cables, but I noted something else which seems strange and I've posted a video of it here:

https://youtu.be/FbCqrdXEito

Not sure if this is a problem or as it should be.

The revving issue is present occasionally also when starting up, ie you press the ignition button, no throttle, engine starts, revs up to say 2000 rpm, slows down jumps up revs at 1800 before which, sometimes after a blip on the throttle, it goes down to 1150ish...

:oops:

Australia
Justcruising
Posts: 66
Joined: Sun Dec 27, 2015 3:33 am
Location: Brisbane, Australia

Re: Rough running R12S

Postby Justcruising » Sat Jul 14, 2018 1:39 am

I go back to my earlier suggestion of doing a recalibration of the Idle Actuators (IA) using a GS-911 or similar, see if mechanic did this simple operation or can. May also be an intermittent problem with an IA. Also, the staggered idle down from cold start, seems inherent. Your YouTube clip seems to demonstrate play at one of the Bowden cable adjusters at a throttle body (if I recognise this correctly) BUT I recall this play does not occur during normal operation ... would need to investigate further on mine! Will have a closer look at mine when back home tomorrow.

Btw, your issue is not unheard of. See similar discussions here http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/501682-12s-engine-dies.html and others if you search!

One last thought, are you using premium unleaded fuel (RON 98 where i am) and personally I would avoid any ethanol blends.
2006 R1200S (Red/Silver) - Michelin PR4s, Akrapovic slip-on silencer, Ohlin suspension, Ilmberger Carbon hugger & Carbon valve-covers, Corbin seat.

2010 R1200R
2004 R1200C Montauk

Great Britain
victorlaszlo
Posts: 211
Joined: Sat Mar 26, 2016 1:48 pm
Location: London

Re: Rough running R12S

Postby victorlaszlo » Sun Jul 15, 2018 11:19 am

I think air leak can be excluded as if I turn the ignition off or blip the throttle it goes back to normal, an air leak would still be present. Also, yesterday I sprayed butan gas around throttle bodies and airbox with no pick up in revs, so hopefully not this.

Someone on pelican parts mentioned idle actuator stopper / motors which can get stuck. Because the motors run through a cycle when ignition is switched on this exercise normally fixes it until next time. To remove these for inspection, is it as simple as unscrewing the safety torx on top of the TBS and pull them out?

Cheers Victor

Australia
Justcruising
Posts: 66
Joined: Sun Dec 27, 2015 3:33 am
Location: Brisbane, Australia

Re: Rough running R12S

Postby Justcruising » Mon Jul 16, 2018 4:33 am

I’ve only ever run the IA calibration function with a GS-911 and have not had a need to remove, dismantle or service an IA, although I recall reading threads of this done ... will see if I can locate. This link might help with understanding the IA issue http://www.hexcode.co.za/techinfo/iac .

Btw, I could not replicate quite the extent of play at one of the Bowden cable adjusters at a throttle body you demonstrated in your YouTube clip (if I recognise this correctly) BUT I don’t think it would come into play without your interference. Can always recheck with your mechanic.
2006 R1200S (Red/Silver) - Michelin PR4s, Akrapovic slip-on silencer, Ohlin suspension, Ilmberger Carbon hugger & Carbon valve-covers, Corbin seat.

2010 R1200R
2004 R1200C Montauk

England
ted
Member
Posts: 145
Joined: Fri Nov 20, 2009 10:56 am
Location: Leeds, United Kingdom

Re: Rough running R12S

Postby ted » Mon Jul 16, 2018 5:12 pm

Sometimes its the simple things that can lead us down many false paths - i once swapped my plugs for top of the range iridium ones. Less than a year later i started with troubles similar to what you describe, against all my instincts but not wanting to start replacing coils etc, i changed the plugs even though i thought it wouldn't be them - yes, the faults were gone - i would try with a full set of new plugs - you might be surprised. Even the threads are knackered you may as well sort it once and for all

Great Britain
victorlaszlo
Posts: 211
Joined: Sat Mar 26, 2016 1:48 pm
Location: London

Re: Rough running R12S

Postby victorlaszlo » Tue Jul 17, 2018 9:45 am

ted wrote:Sometimes its the simple things that can lead us down many false paths - i once swapped my plugs for top of the range iridium ones. Less than a year later i started with troubles similar to what you describe, against all my instincts but not wanting to start replacing coils etc, i changed the plugs even though i thought it wouldn't be them - yes, the faults were gone - i would try with a full set of new plugs - you might be surprised. Even the threads are knackered you may as well sort it once and for all


Actually received them a couple of days ago, change scheduled for today :)


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