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EF using atlot of fuel 

 

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 Post subject: EF using atlot of fuel
Posted: Sun Mar 13, 2011 8:30 pm 
Getting Side Ways
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Hey guys

I went from Adelaide to Pt Pire yesturday, about 200km i used 39ltrs to get there and about the same geting back.

so nearly 20l/100km. pathetic for a long highway trip at 110km/h on flat road.

i checked a few things when i got back.

The end of the exhaust was full of sut( not sure how u spell it )

The spark plugs are really black on the end even tho they are only about 2000km old and there was alot of sut inside the engine bay. The car runs and feels normal but the only thing is that it sometimes even at 110km/h it feel like its cutting out or choking.

Any sudgetions
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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 8:36 pm 
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Ride: BF XR6,

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whats the air filter like?

 

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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 8:40 pm 
Getting Side Ways
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its a K&N panel filter but it looked like it has had a bit of back fire as it smelt a little fuely had soot on it
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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 8:41 pm 
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is it on gas or petrol

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 9:09 pm 
Getting Side Ways
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Age: 29

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Ride: BA XT, NCII V8

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just petrol
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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 9:34 pm 
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Ride: EF Fairmont

Location: Birkdale
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Anything done to the engine? Mine is stock and will only use 9 to 10 litres per 100Ks.
Hows it sound at idle?
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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 9:41 pm 
Getting Side Ways
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NSW, Australia

Mines really good on fuel,uses 8-10 deping on empty car or fully loaded taxi!

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 9:42 pm 
Getting Side Ways
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runs fine on idle and feels normal to drive the trip computer says 10.9ltr/100km but were did the $100 fuel go in 400km there is no leaks and the cant see y the plug would look so bad after 2000km
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 Post subject: Re: EF using atlot of fuel
Posted: Sun Mar 13, 2011 9:50 pm 
Getting Side Ways
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Ride: 1993 EB XR8

Location: BrisVegas
QLD, Australia

/Check all your Vac Lines. Also, how is the O2 Sensor

 

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 Post subject: Re: EF using atlot of fuel
Posted: Mon Mar 14, 2011 12:43 am 
Getting Side Ways
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im thinking its one of the VAC lines as the brake booster has a crack in it as you can hear it whistling getting a new booster on tues have to see how it goes
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 Post subject: Re: EF using atlot of fuel
Posted: Mon Mar 14, 2011 11:20 am 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

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There's no way your EF should be using that much fuel at cruise. And the black plugs after a decent trip would indicate serious over-fuelling.

Could be vacuum leak. Check by spraying engine start spray over the intake manifold and vacuum hoses coming off it. When you spray it on a leak, the spray gets sucked in and the revs increase. Keep it away from the exhaust side: flammable spray + hot exhaust manifold = BOOM.

Could be O2 sensor. Pulling diagnostic codes should tell you if the sensor has died.

Could be MAP sensor (little black box on firewall behind intake manifold). If MAP sensor has failed, you should see black smoke from the exhaust at idle (pull the hose off it with the engine running and you will see what I mean). I don't know if they can partially fail and burn just half rich.

Just a remote possibility: check your coolant temp sensor and air temp sensor (use multimeter with warm engine). If either of these has failed, it may be telling the ECU that the engine hasn't warmed up yet and it will up the fuel to compensate.

My two bits.

 

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 Post subject: Re: EF using atlot of fuel
Posted: Mon Mar 14, 2011 12:43 pm 
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Sounds like you're running really rich. Agreed with the O2 sensor, if it has never been replaced, good time to replace it. They don't last forever and cause major fuel consumption.

You say there is a vacuum leak...definitely a problem. Fix it...gaffa tape/race tape etc or just get a new brake booster and see how the car runs. Vacuum leak will cause lack of power, which means the car needs to run harder to do the same amount of work. So while you're cruising and leaking vacuum, the engine will work harder and requires more fuel.

 

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 Post subject: Re: EF using atlot of fuel
Posted: Mon Mar 14, 2011 12:47 pm 
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phongus wrote:
Sounds like you're running really rich. Agreed with the O2 sensor, if it has never been replaced, good time to replace it. They don't last forever and cause major fuel consumption.

You say there is a vacuum leak...definitely a problem. Fix it...gaffa tape/race tape etc or just get a new brake booster and see how the car runs. Vacuum leak will cause lack of power, which means the car needs to run harder to do the same amount of work. So while you're cruising and leaking vacuum, the engine will work harder and requires more fuel.

yeah i agree, replace the O2 senser and get a spray of air flow meter cleaner as well.

 

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 Post subject: Re: EF using atlot of fuel
Posted: Mon Mar 14, 2011 4:55 pm 
Getting Side Ways
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yeah ill get a booster 2mrw and a O2 sensor while im there.

there is no smoke from the exhaust at idle i sat it against the wall and the wall was still fairly clean after a 10min run
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 Post subject: Re: EF using atlot of fuel
Posted: Fri Mar 18, 2011 9:02 pm 
Getting Side Ways
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Also check that cat converter hasn`t broken up in the exhaust clogging your exhaust system, it will cause excessive consumption.
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