Misfire and oil temp dropping off - Help!

[andy white]

Hi Everyone,

I haven't posted for a while cos' the bike was fine and i was enjoying life

However my bike has a problem

Riding along in top the bike coughed and lost power, looking down i noticed the oil temp on the RID had gone from 5 bars to 0, and the bike missed and nearly stalled, the temp then went to one bar then paced up back to five and the bike ran fine again.
This has happened about ten times now. in all gears and speeds, with the oil temp dropping off during the misfireing.
It has had new plugs (1500 miles ago) air filter is good (K+N) and the oil etc is ok. Have checked the plug leads are on ok. I put optimax petrol in it and dont leave it half full for condensation to get in the fuel.
The oil pressure light dosn't come on during the fault.
I dont think it is the ignition/kill/or sidestand switch because the fuel gague stays on during the missfire. All other indication lights remain normal during the fault.
Has this happenend to anyone out there before?
Does anyone have any suggestions as to what may be the problem?

 

[Bigtwin]

Tis 'lektricul, is my bet.

Fiddled with anything lately?

 

[cookie]

dodgy wire in the loom at the headstock

 

[andy white]

dodgy wire in the loom at the headstock

I hope not, Im hoping it will be something simple not involving potentially expensive words such as new; Throttle position sensor or Motronic

 

[andy white]

Tis 'lektricul, is my bet.

Fiddled with anything lately?

Not on the bike

Just Kidding

 

[Bigtwin]

I hope not, Im hoping it will be something simple not involving potentially expensive words such as new; Throttle position sensor or Motronic

It won't be - pretty certain, due to the temp display nonsense. Sounds like a classic shorting type problem to me.

 

[andy white]

Hmmm.. I think I will take the tank off and have a look for loose connectors, also at the headstock..

My bike has a dealer fitted spyball alarm, is that a clue to the problem??

 

[Bigtwin]

Hmmm.. I think I will take the tank off and have a look for loose connectors, also at the headstock..

My bike has a dealer fitted spyball alarm, is that a clue to the problem??

Dunno re the alarm - not had one of those.

Start with the cheap and easy connectors stuff, and work into the wallet from there...

 

[andy white]

Start with the cheap and easy connectors stuff, and work into the wallet from there...

Sounds like a plan, off to the garage now...

Thanks for the advice everyone. If you think of anything else let me know

 

[Blackal]

Not being an actual GS-owner (BoxerCup for me) - are you saying that the temperature indicator on a GS has "five segments on a display for temperature"?

When I saw "5 bars to zero" - I assumed it was pressure?

Al

 

[Bigtwin]

Not being an actual GS-owner (BoxerCup for me) - are you saying that the temperature indicator on a GS has "five segments on a display for temperature"?

When I saw "5 bars to zero" - I assumed it was pressure?

Al

Temp - 5 is the norm - goes up a few from there (dunno how many actually - 8?).

We don't do pressure.

 

[Steptoe]

Not being an actual GS-owner (BoxerCup for me) -

so shut up, you haven't a clue what we're talking about

 

[Rob Farmer]

Andy,

The spyball interupts the ignition circuit so a problem will cause the RID to die. If they have used dodgy connectors then it could well be your problem. If you are passing by call in for a coffee it'd be good to catch up with you again

 

[Pykie]

Oil sender faliure

Hi,

rather an old thread this, but this may help someone:

I had a similar problem: bike ran well most of the time, but when i came off of a fast bit of road and stopped in traffic the bike would cough and splutter and try to cut out. It would keep running if I kept it revving. If it did stall it would reluctantly restart. The 5th time this happened the RID oil temp guage went all scatty as well.

I took out the oil temp sender, connected up an ohmmeter and heated it up on a camping stove. When it got up to about 4 - 5 bars the resistance reading went all over the place, from no resistance to no connection at all.

Answer: the sensor had deteriorated. When a bike suddenly stops after a run (esp aircooled bikes) it gets very hot for a while, and was getting hot enough to send erratic signals to the ECU. I think the ECU may have responded by going into a faliure mode, and richened up the mixture, effectively 'putting the choke on'.

A new oil temperature sensor fixed it. 97-98 seems to be a 'crossover' year between different senders (at least the supplier thought so), make sure you get the right one.

Pykie

 

[beakster]

OMG!! I have had the exact same problem today, i thought it was cos I'd just filled up, and mabe got some dodgy fuel, but the problem with the RID oil temp is too coincidental.
I'd been to a rally at the weekend, and rode back on sunday through some dreadful rain, so maybe something got a bit damp.
The oil sender unit does sound like it could be guilty. I think it lives on the crankcase above the R/h pot, although I could be wrong.
my bike is a 2002, 1150, on 27k, it did a few little coughs yesterday as the throttle rolled off and what sounded like a very muffled backfire (still on the std cat/can). the Temp bars seemed to cycle from 0 to 5 bars randomly.
Has anyone else suffered the same problem?

 

[Eucherio Rodrigues]

Thanks.

Mine just had exactly the same problem !
1998 R1100GS 81.000 Kms.

will change the oil temp sensor.

Thanks for the guidance !

 

[Merv]

Mine[02 gsa] did exactly the same today,just filled with petrol and same symptoms occured,Thought of crap fuel crossed my mind then noticed no oil temp showing.Temp reappeared and bike running fine before it happened again.Was delivering the bike to be serviced and as im goin to France in 3 weeks the timing for this to happen cud be a whole lot worse!!!!