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old fuel warning

C

Colin Beechey

Just got it firing!
Joined
Aug 10, 2009
Messages
17
I thought petrol took about 6 months to degrade but recently found otherwise after getting my Breva 750 out of its Winter hibernation. The fuel in the bike was only 3 months old but on a run I had overheating and running problems including my EFI warning light coming on. After a few miles I suddenly lost power and the EFI light came on. It seemed as if the Breva was running on only 1 cylinder. Not daring to stop in case it would not restart I stupidly kept going until I reached home. The left cylinder and exhaust was extremely hot, so much that my left silencer was very 'blued', as was the exhaust pipe. I can only put this down to the 3 month old fuel as new fuel in the tank the next day fixed the problem.
Next Winter I will drain the fuel before I lay up the bike for Winter, lesson learned!
 
There may be variations in fuel qualities worldwide. (I know there are.)
Yesterday I finally was able to take the first tour on the Breva, since late October last year, after the longest and coldest winter since the mid-80's.
It has been standing in hibernation since then (October, not the 80's :dry: :mrgreen: ), with just a few liters in the tank.
And it fired right up, after I re-installed the battery, which have been standing in the shed, on a tender.
 
Gas degrades more quickly in the US because 10% ethanol is the new "normal." I used Stabil last fall, and four months later it started and ran fine on the old fuel.

But your problem doesn't sound like a bad gas issue. Did you ever figure it out?

Joe
 
Despite thinking fresh fuel had cured my problems my EFI light came on again several times during a long 200 mile run yesterday. This time I stopped and waited. The engine would reluctantly start after about 15 mins and then would run fine for 20 miles or so until the same thing occured.I managed to get home ok.
I am off to the dealers to get it hooked up to the Axone for diagnosis of my problem - bound to be expensive. I will post what the fault is!
 
Likely to be the lambda/02 sensor by the sounds of it. Do keep us updated.
 
Yeah, it could also be a sticking injector, happened to me on a Buell, or water in the gas.
If something screws up the combustion and you end up with too much or too little oxygen in the exhaust, the O2 sensor will tell the ecu to add more or less fuel to bring it back to the middle. If it hits the end of the available correction allowed it may throw up a flag and say there is a problem with the O2 sensor, but the problem might be with something else (like the injector or coil) but the ecu only knows the O2 sensor is not giving it the value it expects. It just doesn't know why. I point this out because my Buell told me my O2 sensor was bad (error code said O2 sensor) and I replaced it but the issue did not go away. A bit more trouble shooting and I found a sticking injector.
 
Well I am back from the Guzzi workshop, Moto Corsa near Ringwood in the UK. They have many years experience in motorcycle fuel injection.
Getting to Moto Corsa was a 50 mile ride and made exciting by the EFI light coming on twice while in heavy traffic - luckily the loss of power was short lived!
It turned out to be 2 things. First my battery was almost knackered and not holding charge. The fuel injection system relies on resistance readings to work correctly. Once the new battery was installed the bikes computer showed, when connected to the Axone diagnostic machine that the engine temperature sensor was not operating within its expected parameters. This probably explains why it was intermittant rather than the sensor not working at all.
New sensor fitted and all is now perfect, done 200 miles since and the breva is running how it used to! Apart from the expense life is good again.
 
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