Cutting out

  • Thread starter Thread starter Shez_ow01
  • Start date Start date
Thanks,

It is very like a dodgy connection as it cuts in and out so rapidly, I am tempted to replace the ignition switch lead as well, although I have checked it by wiggling maybe my wiggling was not quite right.

Another thing I noticed today whilst balancing the bodies again. When it is warm (4 bars) I can rev it and it will backfire loud enough to wake the dead, this is a new feature it has always popped and banged on overrun but this backfire when revving at a standstill is new and re-producable everytime.
 
Ok, I have spent a few hours this evening setting everything to perfect, even the TPS I got to .363v
Went out for a ride and it happened less and less violently but still happened. I think the less is purely down to the weather being cooler this evening it is 100% temperature related.

Because it is less violent I noticed something:hide

Tell me what drives the rev counter? I noticed when it has its flutters the rev counter dives right down even though the engine is turning, this makes me suspect it is ignition not fuel. The only part of the ignition circuit not replaced is the motronic unit, anybody know how to test that?

When it is running it is stunningly smooth now that everything is set perfectly :) just need it to run like that all the time not just when it feels like it.

Thanks

Shez
 
The only conclusive test for the motronic unit as far as I know is to plug a diagnostic unit in to the bike. Do you know of anyone near you with a GS-911 otherwise it's a dealer.

I have the same problem on my bike R1150 GS. I would be really surprised if it's your Motronic unit by all acccounts they are pretty reliable. I would look to cleaning all your connectors if you have not already done so. Failing that given you have replaced the hell sensor it will probably be a short some where. That's the conclusion I have come to for my bike, it's finding the bloody thing:D

Will be checking the loom next, including the wiring from side stand/clutch and neutral switch. Anyone tell me if a mal functioning neutral switch could cut the engine whilst your riding along?

Keep us posted:thumb

Regards

Simon
 
I have ordered a GS-911, waiting for delivery.....

I figured last time I took it to a shop it cost me more than the tool just to have them diagnose it. I have bought so many parts recently I can keep the thing going for years so may as well have the tool.

I am going to check all the wiring next whilst waiting, probably (hopefully) find the problem just before the tool arrives.

Very interested in your thoughts on the neutral switch as I had very strange behavior from the gear indicator etc the day before it happened, but put that down to washing it the day before.

To add to my pain, my Pan has just had it's first problem in 150+k miles so there is a queue of bikes to get on my bench.

Thanks

Shez
 
I have already peeled back the insulation and cleaned up everything there.
I am going to replace that ignition barrel wire anyway even though I thought that failed when turning mine gives problems when closing or gently opening the throttle very rarely when cruising or opening the throttle hard. and turning doesn't affect it.

Cheers

Shez
 
Have you actually tried shorting out the sidestand switch yet ? The symptoms can be exactly as you described, intermittently switching itself off. then coming back to life with no change.

Stewart
 
The wires on this were twisted together at the start, one of the first suggestions from this forum.

Unless I wonder if there is a break further up the wire to the sidestand, then the twisting together at the end won't cure it.....

Something to try tonight, biggest problem is I have to ride 10 - 20 miles to test it not a problem in itself but when you have to put everything back together only to have it still fail does get rather annoying.

Shez
 
You've gone through months of grief with this.......you've also spent £hundreds on failing to diagnose it and buying stuff that may or may not help you......

Why didn't/don't you just take it to Steptoe and let him sort it :nenau
 
The main reason is getting it there very difficult if you have a bike you don't trust beyond the edge of your village, the secondary reason was it was not critical so it was an as and when job. it has become more important now my Pan has also started to play up.
There is also the fact that I have a full workshop and have been servicing my own bikes and building my own race engines for years without any problems, why should I let my lack of experience with BMWs and Fuel injection beat me.
I have reached a point now where I have bought a GS-911 and have enough spares so if anything goes wrong in the future (and experience tells me it will especially with the mileage I do) hopefully I can resolve it fairly promptly, the spares I have are coil, Hall sensors, HT leads, not a lot, other bits replaced were looking a bit tired anyway.

Shez
 
Definetly not the side stand :(

It will not happen with less than 4 bars on the temp gauge, can a dodgy connection be heat related?

I really have the knack for removing the tank now :)
 
Worth checking, I used to have an old GT250 that would run fine for 15-20 minutes and then cut out and it was the coil, as they heated up they would cause an internal short in the coil and the bike would not run, as the coil cooled down the short would break and the bike would start and run until it got hot enough to short out again.

I would check anything that heats up when running to see if you can work out where its happening, I wouldn't guess its the coil as that takes time to cool and contract, same goes for anything else that will take time to cool, what about one of the circuit breakers ?, I am no expert with "lecktrickery" especially on the GS, but on my mates K100 there is a circuit breaker that cuts all power to everything its to prevent damage when you hit the start button if it tries to draw to much current, he had a dodgy starter motor and when when hitting the start button power to everything would cut out, as I say there may be a similar system on the GS.


don't know if it helps but it may point you in the right direction.
 
Just sat outside with my new GS911 connected watching the temperature climb....

When it got to 91deg started getting error 304 Lambda shorting to earth faults, and watching the real time values the Lambda circuit was switching on and off all the time.

Question is would this cause problems with the bike running, I thought the GS could run with the Lambda disconnected and just went to default values.
Could it be just the right throttle position combined with the intermittent shorting could cause the self preservation to kick in momentarily?

Anyway, plenty of pattern sensors out there so just get another and see what it does.

Those GS911s are good aren't they, very interesting to watch

Shez
 
Very interested in what you find. I am having very similar issues and am going crazy trying to find the problem.

My long tortured thread on ADVrider here.
 
I have seen your threads and noticed some similarities. I will let you know what happens with a new sensor.

Shez
 
Sensor

Why not disconnect it and see if it stops the fault reading / cutting out?.
 
Might try that for now, if the weather stays dry enough for long enough for me to get the tank off when I stop work this evening.

Shez
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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