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The AU I have is getting real poor fuel consumption lately. I'm actually selling it but i want to fix this up first.
I ran a scan tool on it, and it came up with an open circuit knock sensor. Would this cause poor fuel economy, or is it just a timing thing thats affected? I also noticed the temp gauge hardly moves at all. Even on a warm day it moves just over the line where C is. I was thinking of replacing the knock sensor and thermostat first, but the car runs nice and the thermo fans kick in and out as per normal. Any Ideas??
_________________ NEW RIDE - FPV FG F6 6spd Auto. 12.26@114MPH, 1.88 60FT on Cheapy Tyres with 38PSI - Stock except K&N filter! |
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| DJ_Brown |
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Age: 36 Posts: 290 Joined: 10th May 2006 Ride: 5 Spd EA Wagon, 5 spd EF Fairmon Location: Melbourne |
i know that poor fuel economy is normally an oxy sensor issue.. especially if its over 100,000 ks old..
I'm not sure about knock sensor, but possibly with the timing out of whack, it might produce poor economy...
_________________ If you're not driving a manual, you are only steering... |
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| paddle |
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timing is set by the ecu,try clean the oxygen sensor with some carb clean,that may help,or just buy a new one off ebay for $55,is it chuging smoke from the exhaust? maybe the maf sensor has shat,$200 from Fraud,that would be my first poirt of call anyways after the o2 sensor hope this helps
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nar no smoke at all, the car runs perfectly, dosent miss or hunt for idle or anything. it just uses ALOT of fuel.
_________________ NEW RIDE - FPV FG F6 6spd Auto. 12.26@114MPH, 1.88 60FT on Cheapy Tyres with 38PSI - Stock except K&N filter! |
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| koperety |
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crap my car gives quite a lot of smoke of when u give it some and has the same temp thing and crap economy , so that means iv got MAF sensor on the books? ....crap
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| sikford |
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I myself have an au2 and i cant seen to get more than 350 to 400 k's out of it around town.i drive it pretty slow through the week to work and back and the average wont go bellow 14.5 - 15. i have no clue on what it is.its runnin abit rich and ill check it out at work next week but really dont know why i dont get more k's. i brought it because i wanted an economical car but with options and that was comfy.lol
_________________ THE Fairmont Ghia : 75th Anniversary LE |
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| 4dlvr |
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could be due to alot of things, give the car a good service, check all the basics(thermostat, oxysensor even air filter), i found i get better fuel economy from runnning a thicker oil(15w40) then the reccomended(10w30). my cars temp gauge barely changes either, but i can get it as low as 9.5l/100km.
it also comes down to how and where you drive your car
_________________ 96 EF FAIRMONT |
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| koperety |
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hmm mayby someone should write up a theco document explaining where all these sensors are how to get at them and how to clean them ?
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| smoke_ |
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i went down to the car and d/c the temp switch at the back of the head and the gauge went to C and the thermos come on hard. i might get the variable pot onto it and check it against the actual coolant temp to work out whether it's running in warm-up mode and if it is, the temp sender could be stuffed.
i also cleaned the o2 sensor and told my bro to drive it around for the next few days and see how it goes. if its still the same i might have to look into it further to work out what it is and it might even be worth it for me to buy a couple of bits from the wreckers and swap them one by one. the economy was great when i bought it and that was with old oil, old plugs, old fuel and air filter. stupid cars!
_________________ NEW RIDE - FPV FG F6 6spd Auto. 12.26@114MPH, 1.88 60FT on Cheapy Tyres with 38PSI - Stock except K&N filter! |
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| horis |
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probally something like mine
mine are cam angle sensor, coolant sensor, o2 and ecu problems man
_________________ 95 ef montfor sale pm for info, 88 hilux mud truck |
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I put a new thermostat in it and it's fixed the cold temp and it dosent miss at idle like it used to.
the gauge now sits between N and O. with regards to fuel economy, i took it for a 50-60km run and the dte only went down 10km so i think i've fixed it. I will post results in a week or so, as i will be using it this weekend.
_________________ NEW RIDE - FPV FG F6 6spd Auto. 12.26@114MPH, 1.88 60FT on Cheapy Tyres with 38PSI - Stock except K&N filter! |
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| 4dlvr |
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thats good to no, let us know how many liters/100km your doing, ive seen mine in the 9's plenty of times and am averaging about 10.5
_________________ 96 EF FAIRMONT |
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| horis |
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at least yours are all low i would love mine to be at least the 12 or 13lper100 mark mines at 33l-37lper 100
_________________ 95 ef montfor sale pm for info, 88 hilux mud truck |
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| gogetta |
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horis wrote: at least yours are all low i would love mine to be at least the 12 or 13lper100 mark mines at 33l-37lper 100
that is rediculess, i disconnected the O2 altogether and i only got a worst of 15L/100
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| horis |
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tell me bout it on the mount cootha cruise i got the best its been at 23lper 100
_________________ 95 ef montfor sale pm for info, 88 hilux mud truck |
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12.06@120MPH
