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Gremlins Have Gone

double.d

double.d

Cruisin' Guzzisti
GT Contributor
Joined
Oct 27, 2008
Messages
298
Location
BRISBANE AUSTRALIA
I have always had the problem of my fuel reserve light comming on with 6 litres left in the tank, around 180klm. Well, the last 3 rides i have had the light has been comming on when it should, with 3ltr and around 230klm on the clock. I have also noticed that fuel usage, which was always around 6.1-4l/100 has now dropped to 5.4 l/100. This figure would be the best as i tested it for 40klm at no more than 110kph.

What stats are you getting on your 1100 ?.
 
My 1100 used to get same as yours 6.1 to 6.4 l per 100 as long as I was being *sensible*.

You may find the improved consumption is is down to the hot weather. Have you done the 'Pack the temp sensor' trick yet?

Pete
 
>>Pack the temp sensor' trick

More information on this one, svp.

ADVthanksANCE

-Jack
 
I thought I'd covered this a zillion times before? Perhaps it was on the old board.

The engine temperature sensor sits in a plastic holder in the back of the RH head. The problem is that in most cases there is an air gap between the end of the ETS and the material of the head. Air is a superb insulator, that's why double glazing is so effective and why we wear clothes:laugh: .

Problem is in this circumstance you don't want the ETS insulated. It is very easy to check this with Axone or the VDST system as the engine temperature is displayed for you. In many, most, cases you'll find that even when the cylinder head is so hot that your finger will sizzle if you stick your finger on it adjacent to the ETS the tool will show that the ETS is showing that the motor is much, much cooler Quite often not even registering 50*C even when the head itself is finger-sizzlingly hot!

Since the ECU uses the engine temperature as one of the main inputs for adjusting the mixture this low reading will lead to the ECU artificially enrichening the mixture because the ECU still sees the engine as 'Cold'. It is, effectively, like riding around with the choke on all the time!

I've found that removing the sender from the plastic housing and adding some sort of thermal paste, I use zinc based anti seize, to the holder before screwing it in again CAREFULLY as if you do it too fast and any excess can't escape it will tend to crack the holder hydraulicly. (I also leave it a bit loose and then warm the motor up thoroughly after installation as this allows the excess to creep up out past the threads as it expands. when very hot you can then screw it fully home.) allows far better heat conduction to the sensor and a far more accurate temperaure reading and therefore lower fuel consumption.

Let it be noted that various people have 'Pooh-poohed' this idea but it seems that with the newer motors, most specifically my 8V, even though the sensor has been moved to the engine block it is now seemingly dipped in thermal paste at the factory as when I PD's mine it already had some on!!!!! Also the tool doesn't lie the ECU does think the engine is cold.

There is also available a brass sensor holder that can replace the POS plastic one. This is a worthwhile upgrade and is far less likely to crack as the paste heats up but I'd still suggest using the paste even with that. The whole idea is to get the tip oif the sensor to sit in a 'Deep fat fryer' rather than an air pocket!!!!!

Pete
 
The engine temp sensor is often installed in such a way that it tries to measure the temperature as if from geosynchronous orbit (meaning it doesn't make proper contact with the engine wall). Thence, the ECU gets to believe the engine is cooler than it really is, and adds more fuel. The trick is to take the sensor and its holder out, fill the hole with some thermo-conductive paste (the same stuff Apple slathered its 1st series of Intel laptops in), and reinstall the sensor.
 
pete roper wrote:
My 1100 used to get same as yours 6.1 to 6.4 l per 100 as long as I was being *sensible*.

You may find the improved consumption is is down to the hot weather. Have you done the 'Pack the temp sensor' trick yet?

Pete
Click to expand...

Pete, no i have not done the temp sensor thing yet, the bike seems to be running perfect ( but one always requires more grunt) so i have not seen the need. But on your insistance i will have a go;)

The past few times i have ridden it has been early in the morning and i am always back by lunchtime so the air temp has never been above 22c on those occasions, and the morning starts out at around 12c. I will be riding less over summer now cause it is just to hot and uncomfortable:blink: , this heat sends me a bit :silly: .

It just seems like a tech issue to me because of the fuel light fixing itself, or its the fact that the little quirks that the factory put into their bikes to see if i will stick by them ( are you a real Guzzi enthusiast ) are past their use by date and i have passed.

Hey, the factory started testing my enthusiasm 23 years ago:huh: and i have not given up yet, so leave me alone now and go pick on someone else :p .
 
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