Chug chug stall flickering tacho

[mylovelyhorse]

That more or less sums up the point in my commute this morning where it all came to a stop.

I was 2 miles from work, 6 miles from my digs and 110 miles from my home & garage

The bike (a 1999 R1150GS @ 104k miles) chugged a couple of times on the way in, something it hasn't done before. I thought it was a fuel flow issue and thought "must change the fuel filter" - although it's not exactly old (maybe 8k, more likely less). I also wondered if it wasn't charging so I flicked the lights off to help if the battery was being drained.

It then proved to be a little difficult to keep going as I dribbled past a school and then basically stopped running a little further down the road.

As it stopped running, the tacho flickered despite the engine being off. It then went on flickering up as far as 5k and then down, hovering around the lower end of the scale. I tried to start it a couple of times. It turned over fine, popped, banged, nearly fired, tacho flicked around a lot but it wouldn't catch.

It's not a precise multimeter but my GPS has a voltmeter so I attached that (engine off) - 12.2v. didn't think to see what happened when I turned the ignition on.

So I parked it up in Winterbourne and got a colleague to come and collect me.

Do these symptoms suggest anything to anyone?

Cheers

M

 

[Aidan1150]

I hope I'm wrong, but isn't the bouncy rev counter a symptom of failed Hall Sensor?

 

[wildbeeste]

Flickering tacho chug chug
I think that may mean "hall sensor"
http://www.ukgser.com/forums/showthread.php?t=246493&highlight=hall+sensor

 

[mylovelyhorse]

Flickering tacho chug chug
I think that may mean "hall sensor"
http://www.ukgser.com/forums/showthread.php?t=246493&highlight=hall+sensor

That thread actually led through Hall sensor to dodgy electrical connection on coil, so I'll whip the tank off after work and have a general look about. Not that I've a crimp tool or anything here in Brizzle. Hmm.

Cheers!

 

[DrFarkoff]

Sounds like the Hall sensor thing

Just a word of warning Do not hold the spark plug or try to do anything with it if the ignition is on!

I did this with TUNEDIN's bike and got my pan knocked in as we say locally!

It decided to spark while i was refitting the sparkplug and the bike was on the ramp so I didn't notice the ignition on

I was doing a funky shuffle for about 10 seconds till i could let go of the bastrad!

 

[wildbeeste]

Sounds like the Hall sensor thing

Just a word of warning Do not hold the spark plug or try to do anything with it if the ignition is on!

I did this with TUNEDIN's bike and got my pan knocked in as we say locally!

It decided to spark while i was refitting the sparkplug and the bike was on the ramp so I didn't notice the ignition on

I was doing a funky shuffle for about 10 seconds till i could let go of the bastrad!

I want to say I am sorry to hear about this but I am laughing too much at the imagery

 

[DrFarkoff]

I want to say I am sorry to hear about this but I am laughing too much at the imagery

Don't worry I still Giggle every time I think of it It's just a shame Tuned wasn't there with a camera we could shared the "You've been framed! Vid of the Century!"

 

[mylovelyhorse]

Turned out to be a loose wire under the tank - I've checked the Hall sensors and they're fine

I returned to the bike Thurs evening, ready and prepared to be recovered back home by Britannia Rescue. In fact I called them out when I got there.

I tried to start the bike and could hear an arcing noise from under the tank so I shut the ignition PDQ!

Having only the BMW toolkit and my trusty Teng BBX19, I whipped the tank off and had a good root round. As I have no ABS, I have used the large space in front of the battery to house the fuse box that controls the Autocom and the relays etc for the various extra spots, fog lamps and so on. I cleaned up a couple of vaguely corroded looking connections and removed the heated jacket wires (just in case - not using it in this weather anyhow).
Just as the recovery truck arrived I had it all back together and was testing things. The ignition came on, no noise from under the tank and all seemed just fine.

Rode home without incident. Hurrah!

I have a friend with a diagnostic tool that plugs into the socket on top of the airbox. He lent me that on Sunday so I installed the software on my laptop that evening and tested the system. No fault codes shown on the brain and the Hall sensors test showed them to be in good order.

Problem fixed

 

[mylovelyhorse]

http://www.ukgser.com/forums/showthread.php?t=246493&highlight=hall+sensor

Thanks for this link, this is what made me first wonder if it could be a response to an 'accidental earthing' or other dodgy connection. Getting back to the bike without my lid on and earplugs in let me hear the Big Clue coming from under the tank.