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VERY bad fuel economy 

 

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 Post subject: VERY bad fuel economy
Posted: Thu May 06, 2010 8:18 pm 
Oompa Loompa
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Age: 30

Posts: 24

Joined: 19th Aug 2009

Gallery: 1 images

Ride: AU III XR6 HP

Location: Melbourne
VIC, Australia

2002 AuIII XR6 auto
Bought it at 144000kms. All iv done to it is a KnN panel filter and intake manifold spacers.
Have had the 02 sensor replaced, rebuilt the transmission and major service.
Am recently averaging 200 kms city driving. Givin I might put me foot into it here and there but not so often as to absolutley destroy the economy this bad. Any ideas. I use BP Ultimate most of the time. Highway its pretty good though??? HELP!!!!
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 Post subject: Re: VERY bad fuel economy
Posted: Thu May 06, 2010 8:26 pm 
Stock as a Rock
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Age: 33

Posts: 141

Joined: 17th Jun 2006

Ride: Falcon

Location: canberra
ACT, Australia

Have you checked your map sensor? Checked for codes?

 

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 Post subject: Re: VERY bad fuel economy
Posted: Thu May 06, 2010 9:03 pm 
Oompa Loompa
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Age: 30

Posts: 24

Joined: 19th Aug 2009

Gallery: 1 images

Ride: AU III XR6 HP

Location: Melbourne
VIC, Australia

Wat am I looking for with the map sensor???? How do i check for error codes
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 Post subject: Re: VERY bad fuel economy
Posted: Thu May 06, 2010 9:11 pm 
Getting Side Ways
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Age: 31

Posts: 885

Joined: 14th Mar 2007

Location: Castlemaine
VIC, Australia

Before i got lpg on a 98 AU engined EL, i used to get 250km's to a tank of petrol in melb.
First off, your car is designed to run most efficiently on 91, so stick to that for economy and power unless you have f**k with your timing.

Does the car backfire at all? Check all hoses, esp the one that connects from the map sensor on the firewall (little black doozey) and make sure that pipes straight into the centre of the intake runners on the outside of the engine.

Spark plug gaps, autospeed.com has a great article on spark plug wear if your unsure as whether to replace them or not.

Thats a good starting point which shouldnt take you 5mins :)

 

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 Post subject: Re: VERY bad fuel economy
Posted: Fri May 07, 2010 4:59 pm 
Getting Side Ways
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Age: 28

Posts: 1135

Joined: 27th Oct 2005

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Location: SA
SA, Australia

Being that bad id have a bet on it being a faulty oxygen sensor. Used to get pretty bad economy in my EF, got about 280km to a tank of fuel.... oxygen sensor was totally shot!
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 Post subject: Re: VERY bad fuel economy
Posted: Fri May 07, 2010 5:36 pm 
Getting Side Ways
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Posts: 2410

Joined: 4th Sep 2006

Location: Sydney
NSW, Australia

I get 430kms out of a tank of petrol in my EF XR6 so u should at least get that with ur AU

 

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 Post subject: Re: VERY bad fuel economy
Posted: Fri May 07, 2010 6:04 pm 
NSW Cruise Moderator
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Age: 39

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Location: ɹǝpun uʍop
NSW, Australia

could be a blocked cat. these sap power and cause the car to burn exessive fuel.

Climb under and give the cat a few taps, if it rattles its rooted.

 

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 Post subject: Re: VERY bad fuel economy
Posted: Fri May 07, 2010 8:24 pm 
QLD Cruise Moderator
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Age: 52

Posts: 407

Joined: 20th Jul 2009

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Ride: EF Ford Falcon Wagon

Location: Atkinsons Dam an hour out of Brisbane
QLD, Australia

check for leaks you should be getting alot more than that
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 Post subject: Re: VERY bad fuel economy
Posted: Sat May 08, 2010 11:37 am 
Parts Gopher
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Age: 26

Posts: 87

Joined: 20th Sep 2009

Ride: FG Falcon XR6, Nitro Blue

Location: Gisborne
VIC, Australia

sorry to hijack thread. i performed cheap little DIY mod to my airbox recently (cut a hole in the front :D) and it seems my fuel economy has dropped? by roughly 50-60km its not much i know..but thought that something like this would increase it?
not sure if related or if it supposed to do this, but ive noticed now that at approx 2400-3500rpm my car sounds alot more different now?

 

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 Post subject: Re: VERY bad fuel economy
Posted: Sun May 09, 2010 1:35 am 
Getting Side Ways
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Location: Sydney
NSW, Australia

Thats weird i also would of thought economy would of been a little better. Did this happen right away once u done the airbox mod???

 

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 Post subject: Re: VERY bad fuel economy
Posted: Sun May 09, 2010 6:36 pm 
Parts Gopher
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Age: 26

Posts: 87

Joined: 20th Sep 2009

Ride: FG Falcon XR6, Nitro Blue

Location: Gisborne
VIC, Australia

umm..well i bought new tyres roughly a month ago!
ive only run just under 2 tanks of fuel through it since the mod.. and it seems its getting less out of it.
i installed a sub and amp yesterday, so battery was disconnected for a fair while..
should have reset and will see how i go with economy this week!

 

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 Post subject: Re: VERY bad fuel economy
Posted: Tue May 11, 2010 6:46 pm 
Oompa Loompa
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Age: 30

Posts: 24

Joined: 19th Aug 2009

Gallery: 1 images

Ride: AU III XR6 HP

Location: Melbourne
VIC, Australia

Well I put half a tank of 91 in last week 200 kms. So I really dont know wats going on 200kms off half a tank of 91 vs 200 kms on a full tank of 98!!!!!!??????
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 Post subject: Re: VERY bad fuel economy
Posted: Wed May 12, 2010 8:36 pm 
Getting Side Ways
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Age: 31

Posts: 885

Joined: 14th Mar 2007

Location: Castlemaine
VIC, Australia

they aint designed to run on 98

 

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it can be fast and cheap,but it wont be reliable
it can be reliable and cheap,but it wont be fast
or you can be fast and reliable,but it wont be cheap

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