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19-01-2012, 08:27 AM
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#1 | ||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Hi guys, all of a sudden my AU3 (4.0lt) is drinking like there's no tomorrow.
Have done 280kms from a full tank and it's on 1/4 tank already!  When I bought it just before Christmas I was getting 650-700kms a tank. Doesn't seem to be running any different just drinking like hell. There's no fuel leaks. Any idea's why it would? Thanks , Dave |
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19-01-2012, 09:38 AM
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#2 | ||
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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Ok so fuel guages lie
are you running your aircon? when was the last time you gave it a good servicing?
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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21-01-2012, 01:23 AM
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#3 | |||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Quote:
Yes running a/c everyday lately Service? Like what what kind of things? Just dont know why it would suddenly drink so much |
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21-01-2012, 10:06 AM
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#4 | ||
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rexnet
Join Date: Feb 2010
Location: Adelaide, South Australia
Posts: 3,562
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O2 sensor. try replacing that see what happens.
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22-01-2012, 12:48 AM
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#5 | ||
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Bugger!
Join Date: Jul 2011
Location: Albany, WA
Posts: 3,307
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The most common causes of sudden fuel consumption are air filter, o2 sensor, MAP sensor (also runs like crap), and a blocked exhaust. Try those and see what happens. Probably wouldn't worry about replacing the MAP sensor as you'd know all about it if it was U/S
__________________
Whoops, there goes another factory setup! Chop and change - butchering cars since 1990 
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23-01-2012, 01:36 PM
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#6 | ||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Shouldn't the warning light come up on the dash if it was the 02 sensor, MAP etc?
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23-01-2012, 02:02 PM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Jul 2009
Posts: 3,427
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High fuel pressure will also cause this eg fuel regulator blockage.
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23-01-2012, 02:38 PM
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#8 | |||
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FF.Com.Au Hardcore
Join Date: Jun 2005
Posts: 588
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23-01-2012, 03:03 PM
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#9 | ||
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Critical Thinker
Join Date: Jan 2005
Location: Adelaide
Posts: 20,374
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Agree with the above. 02 sensor would be the first thing I would replace. Then I would look at blocked cat converter if the 02 sensor is a no go.
__________________
"the greatest trick the devil pulled, is convincing the world he doesn't exist" 2022 Mazda CX5 GTSP Turbo 2018 Hyundai Santa Fe Highlander 1967 XR FALCON 500 Cars previously owned: 2021 Subaru Outback Sport 2018 Subaru XV-S 2012 Subaru Forester X 2007 Subaru Liberty GT 2001 AU2 75th Anniversary Futura 2001 Subaru GX wagon 1991 EB XR8 1977 XC Fairmont 1990 EA S Pak 1984 XE S Pak 1982 ZJ Fairlane 1983 XE Fairmont 1989 EA Falcon 1984 Datsun Bluebird Wagon 1975 Honda Civic |
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28-01-2012, 12:08 AM
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#10 | ||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Ok will do thanks guys. When I filled it last I put Shell 98 in to see how that goes. Gone just below 3/4 now and done 180kms. Been driving it a bit like a grandma on valium though lol.
I wonder if I had bad fuel, the fuel use went bad after I filled at a roadhouse in Kaniva, or could have been Nhill, cant remember, in Vic. Also got the back loaded with work gear and roof racks and ladders on. A/C going everyday too. |
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28-01-2012, 10:18 AM
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#11 | ||
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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Yeah so is the load a new thing too? One of the AU's biggest skills is aerodynamics (the same as a bullet) so ruining it with a ladder will see differences in fuel consumption.
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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28-01-2012, 10:23 AM
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#12 | |||
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Fossil fuel consumer
 
Join Date: Jul 2005
Location: Mod For: Pub, Bar, Sales Yard, Show 'N Shine, Photoshop, AU to BF, FG to FGX, Territory & Sports Bar
Posts: 17,049
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Quote:
yeh try exhaust areas first, then move on to the other suggestions
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2024 RS 3 sedan - Mythos Black 2023 Superb Sportline sedan - Steel Grey 2025 Mustang GT - Vapour Blue |
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28-01-2012, 10:59 PM
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#13 | |||
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Regular Member
Join Date: Jan 2012
Posts: 92
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28-01-2012, 11:02 PM
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#14 | |||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Quote:
Yeh I think a V8 would get better economy than that. My inlaws 5.0lt VN gets over 700kms a tank easy. |
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29-01-2012, 12:50 AM
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#15 | ||
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Fossil fuel consumer
Join Date: Jul 2005
Location: Mod For: Pub, Bar, Sales Yard, Show 'N Shine, Photoshop, AU to BF, FG to FGX, Territory & Sports Bar
Posts: 17,049
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his VN is a lot lighter
my AU V8 gets 650 on the highway, but about 400 in town
__________________
2024 RS 3 sedan - Mythos Black 2023 Superb Sportline sedan - Steel Grey 2025 Mustang GT - Vapour Blue |
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29-01-2012, 09:00 PM
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#16 | ||
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FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Melb north
Posts: 12,025
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my vct xr6 sedan will easily do 700 k`s on a run for 60 litres, a little more if i treat it nicely, hot weather and loaded roof racks wont be helping your cause that`s for sure.
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29-02-2012, 11:05 PM
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#17 | ||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Well a bit of an update, It's getting a little better fuel wise around town, and also running better.
I replaced the old spark plugs with iridium ones and noticed a little oil leaking from the inlet manifold join to head so I checked all the inlet manifold to head bolts and most were not tight at all so I tightened them all up. A couple were bastards to get at to tighten too. It was sucking in unmetered air. After this, the slight engine hunting under load diminished and the idle rose 150rpm initially but it was still sluggish under 3000rpm. Next I put a new air and fuel filter in and I emptied the petrol out of the old filter. It was very brown and dirty there's crap in the tank. It goes better again and more responsive under 3000rpm When I get time I'll take out the tank and flush it out, also the fuel pump. |
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01-03-2012, 10:08 AM
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#18 | ||
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Flairs - Truckers Delight
Join Date: Aug 2006
Location: Brisbane Northside Likes: Opposite Lock
Posts: 5,731
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i knew a good servicing would fix most of your issues
__________________
Current: Silhouette Black 2007 SY Ford Territory TX RWD 7-seater "Black Banger"
2006-2016: Regency Red 2000 AUII Ford Falcon Forte Automatic Sedan Tickford LPG "Millennium Falcon" |
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02-03-2012, 12:30 AM
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#19 | |||
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Regular Member
Join Date: Jan 2012
Posts: 92
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Quote:
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AU3 excessive fuel use
Linear Mode
