New technical articles by Nick.

[Nick V]

Good day all!

Three more technical articles have been added to the site list:

Aftermarket Spark Plug Listing (BMW F-, R-, K-series models, '04 on)
This will be of use to those intrepid souls who'd like to use spark plugs other than the ones BMW Says You Must Use™.

Replacement of RDC sensor batteries (All BMW models equipped with RDC)
A procedure for exchanging the lithium batteries in 'dead' RDC tyre-pressure sensors.

Throttle Position Sensor (BMW F-, R- & K-series, '04 on)
A procedure for fault diagnosis and repair of malfunctioning throttle-position sensors on 2006-2014 F-series, 2004-2013 R-series and 2005-present K-series fours.

To get to the repository of all my tech articles so far, click here:
http://www.ukgser.com/technical/index.htm?
I can't post this on every forum... so if you have a buddy in trouble, please feel free to spread the word!

 

[shez1]

Thanks for posting.

Very useful, thanks for taking the time.

 

[Rockred]

Yes thanks for all the time and commitment you have put in. They have added a great deal to the knowledge base on here.

 

[adventuredon]

Top man, thank you and we'll written

 

[Nick V]

It's been a pleasure!

More on the way soon (holiday time permitting)!

 

[ATG]

Nick;

Great work ! BMW should copy you...

On the subject:

11. Average fuel consumption 1 (CONS 1).
The display can be configured by BMW to read in either litres per hundred kilometres or miles per gallon.
12. Average fuel consumption 2 (CONS 2).
The display can be configured by BMW to read in either litres per hundred kilometres or miles per gallon.

At least in some countries, Brazil among them, it is also possible to have it set so it reads Km per one liter.

Andre

 

[dave hendy]

Well done Nick, keep up the good work

 

[kurienp]

Top man! Thanks for taking the time and effort to get this together.

 

[AyrtonO]

Good day all!

Throttle Position Sensor (BMW F-, R- & K-series, '04 on)
A procedure for fault diagnosis and repair of malfunctioning throttle-position sensors on 2006-2014 F-series, 2004-2013 R-series and 2005-present K-series fours.

Hi Nick! Since I seem have no rights to reply you privately, will post my question here concerning your article. It's nice, thanks a lot, but how sure you are about these values:

"With the brush spindle turned to it’s fully clockwise position:
Indicated resistance between terminals 1 and 2 should read approximately 5.3.
Indicated resistance between terminals 1 and 3 should read approximately 4.4.
Indicated resistance between terminals 2 and 3 should read approximately 0.7.

With the brush spindle turned to it’s fully anti-clockwise position:
Indicated resistance between terminals 1 and 2 should read approximately 0.9.
Indicated resistance between terminals 1 and 3 should read approximately 0.9.
Indicated resistance between terminals 2 and 3 should read approximately 1.5."


Since my sensor values in anti-clockwise position shows about 0.9, 4.3 and 5.2 - so same but opposite than clockwise position. Which one should be correct ?

Petri M.

 

[Nick V]

Since my sensor values in anti-clockwise position shows about 0.9, 4.3 and 5.2 - so same but opposite than clockwise position. Which one should be correct ?

Hi Petri!

When I wrote that document, the TPS I had came from a 2010 R1200GS Adventure.

This year, I've been doing a lot of work on combining a belt-drive F800GT engine with an F800GS frame. All three bikes use the same sensor - but I noticed that on F-series parallel twins, depending on how tight the clearance is between frame and sensor, the sensor can be assembled in different configurations using the same parts (so it can face either up or down with the spindle in the same relative position).
This might be what's causing the values stated in the document to be 'mirror-imaged'.

What bike was your TPS removed from?

Also, what symptoms (if any) is the bike manifesting? Any misfires, refusing to idle, grey smoke etc?

Do you have access to a GS-911? Or to BMW diagnostic equipment? When you open the throttle, the real-time TPS value should be proceeding from 0% to 100% on a sequential scale, with no jumps or unusual values.

Have a look, and let me know!

 

[AyrtonO]

Hi Nick,

it's 2008 GSA. I have been since last year hunting down those famous cold-idling symptoms, in my case they are something like this:

- after start, some 10 secs idle quite ok
- after that, idle goes more or less much erratic, rough, I use term "tractor-like", so kind of pinging/misfiring/pre-ignition or something. Also using throttle here would very easily lead to stalling. Idle speed looks normal though.
- but soon as motor warms up near normal temp, it runs quite ok, no symptoms of stalling.

GS911 shows no faults, even O2 sensors looks quite normal. Also tried during winter service check throttle body syncing, calibrate steppers, cable checks, coils ok... Must be something related to engine temperature, so now checked TPS (looked fine, just those different values to your instructions), next wonder if it could be something with cam tensioners or position sensor. Just in forums seems owners seemed found no help replacing cam tensioners either...

Also this symptom was already last summer, at winter put bike in half for clutch replacement (so throttle bodies etc were removed, everything cleaned and installed back) but these symptoms did not disappeared.

Also maybe should really put GS911 logging everything when running it from cold to operating temperature and investigate if somebody notices something in log values.

In my case situation has not been (yet) so impossible (like some other GS-owners), just annoying having to wait engine to warm well until getting on the road.

P