Fuel Consumption

[Midnite]

No idea if this is new. I have a AU2 Fairmont Ghia 6 cyl ). By the fuel consumption gizmo ( tech term ) on dash my consumption keeps increasing. Are theses gizmos inaccurate or is my consumption really increasing. I do mainly short trips ( Harley for long )..... so hard to judge by odometer. Any words of wisdom welcome.

[howesy]

Originally Posted by Midnite

No idea if this is new. I have a AU2 Fairmont Ghia 6 cyl ). By the fuel consumption gizmo ( tech term ) on dash my consumption keeps increasing. Are theses gizmos inaccurate or is my consumption really increasing. I do mainly short trips ( Harley for long )..... so hard to judge by odometer. Any words of wisdom welcome.

They are OK but just a gimmmick. like a vacuum guage just use it to give you an idea. reset your trip meter every fill and divide litres taken by km to get
l/100km
e.g - car took 68.5 litres and you had done 526.7km
68.5 divided by 5.267 = 13.005 litres per 100km

The only reasonably consistant way to keep it all in check and when the milage changes you know its time to clean the filters.

[SSD-85]

Originally Posted by Midnite

No idea if this is new. I have a AU2 Fairmont Ghia 6 cyl ). By the fuel consumption gizmo ( tech term ) on dash my consumption keeps increasing. Are theses gizmos inaccurate or is my consumption really increasing. I do mainly short trips ( Harley for long )..... so hard to judge by odometer. Any words of wisdom welcome.

I have an au2 vct xr6, which is essentially the same as your monty ghia, my consumption calculator is the same, fuel consumption seriously does increase round town, but not to the degree it says it does. the calculator becomes ALOT more accurate on the highway. the best thing to do is simply ignore it and look at your fuel gauge, it tends to be more accurate in all driving situations.

[mik]

if your traffic is getting bad like it is in Melb lately your economy probably is goin down hill, been bumper to bumper goin to the city from northern burbs for some reason.

[changinghia]

I have the same problem with my AU series 1 V8 Fairlane. Its done 140000 k's regularly serviced and well treated with new plugs, new leads, new air filter all done at the last service along with oil and filter. Fuel filter changed within the last 12 months as well. Had the cats checked, one was a bit knackered so both replaced with hi-flos. Still no improvement. Rang around and was told by a tuner on the phone it could be o2 sensors so i swapped in some new bosch aftermarkets and reset the ecu but still the consumption is high. Until a month or so ago it was around the 13.5litres/100km on the trip computer but now it sits around 17.5litres/100km if i drive like a nun. A little energetic driving and it is pushing 20.0litres/100km and it is definitely running rich as the new chrome tip on my exhaust is black with deposits and I am getting less than 350-400k's to a 65 litre tank when i reset the trip and run it to empty. Im taking it for a long run up the freeway tonight. If that doesn't work then I'll be getting a flash tune, unless someone else who has experienced this has a decent solution.

[sly]

If it's running that rich then maybe the new O2 sensors aren't working properly? Or perhaps the Engine Coolant Temperature sensor or Intake Air Temperature sensor are knackered? If all the basics (plugs, leads, filters etc) are all good then it's probably worth having the computer scanned for DTC's to pinpoint any sensor malfunction.

[changinghia]

Originally Posted by sly

If it's running that rich then maybe the new O2 sensors aren't working properly? Or perhaps the Engine Coolant Temperature sensor or Intake Air Temperature sensor are knackered? If all the basics (plugs, leads, filters etc) are all good then it's probably worth having the computer scanned for DTC's to pinpoint any sensor malfunction.

wouldn't any of those sensors malfunctioning light my dash up with warning lights ??