Consumption big difference

[Gintonic]

Good evening everyone
It's been a long time since my last post here I hope all are safe and in good health.
I have an Omega V6 3.0 manual from 2000. Since I m not in UK it's Opel omega executive (I think elite is the model in UK)
I have it for almost 2 years it runs on LPG
Since for almost a year it ran a bit rough, not as smooth as it should, ran like it had a missfire, all 6 cilinders were here but it was shaking a lot. Consumption on board comp was between 18 and 21 liter on 100 km. Comp diagnostics showed nothing.
2 weeks ago I took el. contact spray and carefully sprayed  all connectors that I could find in the engine area. Literally everywhere where the connector was I disconnected it and  cleaned it.
Engine started to run very smooth. Almost normal. I could place a glass of beer on engine. Vibrations are minimal but there are some mount s that I have to change that are the cause of very small vibrations
Main thing. Board started showing consumption of 13 to 16 liter per 100 km. So that's 5 liters less. Also in real life numbers are here. Does it show lpg or petrol consumption I have no idea. I have no idea what I have done, because I opened everything. Anyone with similar experience? strictly driving in town, small town, lots of traffic, start stop all the time,  city mode

[Raeturbo]

No idea what you done, but I wish you would do it to my car too👍👍👍👍😂😂

[Gintonic]

 

[deviator]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

[Doctor Gollum]

If it were coolant sensor related it would overfuel to the point of flooding it and being lpg it would never swirch over because it was always think it's cold, although this depends how it's wired... Worst case it would double fuel it, see above.

Computer only shows what it thinks the petrol consumption is. The computer cannot calculate zero, so even left idling, it will eventually cause it to drop.

Basically if your actual gas tank range is unchanged for a given literage of fuel then i wouldn't worry, especially if it is running well 

The 'economy' of lpg comes from the fuel cost, not efficiency

[STEMO]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel economy is up.

[Doctor Gollum]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel consumption is up.

Fixed... Litres per km not mpg 

[STEMO]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel consumption is up.

Fixed... Litres per km not mpg 

You haven't fixed anything, you've just got it wrong. 18-21 litres per 100km is higher consumption than 13-16 litres per 100 km. Dear me 

[Doctor Gollum]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel consumption is up.

Fixed... Litres per km not mpg 

You haven't fixed anything, you've just got it wrong. 18-21 litres per 100km is higher consumption than 13-16 litres per 100 km. Dear me 

You wrote 'economy', which I fixed to 'consumption' 

But you're absolutely correct, fixing it is up to Gintonic

[Enceladus]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel consumption is up.

Fixed... Litres per km not mpg 

You haven't fixed anything, you've just got it wrong. 18-21 litres per 100km is higher consumption than 13-16 litres per 100 km. Dear me 

You wrote 'economy', which I fixed to 'consumption' 

But you're absolutely correct, fixing it is up to Gintonic

The OP started with 18<=>21 litres per 100km.
He ended up with 13<=>16 litres per 100km.
So fuel economy improved, also the engine runs smoother.

[STEMO]

I wonder if this could be a failing sensor?

I will say, if the fuel economy is down and it's been serviced. Then my first port of call would be the coolant temp sensor. There are 2, one for the ECU, one for the clocks. These do fail and when they do, they cause the car to overfuel as it always reads cold.

The fuel consumption is up.

Fixed... Litres per km not mpg 

You haven't fixed anything, you've just got it wrong. 18-21 litres per 100km is higher consumption than 13-16 litres per 100 km. Dear me 

You wrote 'economy', which I fixed to 'consumption' 

But you're absolutely correct, fixing it is up to Gintonic

Except economy was right and consumption is wrong, so you didn't fix it. And it doesn't need fixing, he has fixed it.

[Doctor Gollum]

Oh yes

[Gintonic]

And I have no idea what did I fix exactly 
Well, after cleaning,  the ,, bad rpm sensor,, no longer shows on diagnostic so I suspect that cleaning the connector helped. Also the small vacuum that is behind the top of the engine and is connected with a small U shaped rubber hose., I cleaned that and fixed it to be in place, it was out of his place.Only thing that I don't know is where that vacuum plastic pipe that goes from it to the front of the engine where should be connected.

[Doctor Gollum]

It connects to the throttle body, underneath

[Gintonic]

If someone could share a picture, I can't find it, tried many times to find the place
Thanks