I have read all the other threads on this subject that I can find on this forum, but haven't really been able to find an answer. My cars specs are in my sig if you want that bit of info. Heres the problem.
I am getting very high fuel consumption and haven't been able to fix the problem. It is currently using about 14L/100km on the highway and about 19-20L/100km city and I have been driving like a granny to try to keep the fuel consumption down. I have done the following to try and fix the problem..
Carbon flush (injectors cleaned)
Engine tune (including new spark plugs)
Air filter is new
Fuel filter is new
Code were checked by dealer and no problems were found
Thermostat was found to be slightly off and replaced with a new one
spark plug cables tested ok. This is everything I have done and the consumption has dropped about 3L/100km. The car runs perfectly and show no sign that it is having problems.
What is left that could be causing this?? Also what else is there in an EB2 that affects, or can affect, fuel consumption?
Two things......dissy cap/rotor button, timing and catalytic converter. My thing had similar figures to you, my timing was way off and rotor button was stuffed. I instantly went from 200 kays per tank (it was pretty thirsty lol) to 400 when I replaced the dissy cap and rotor button and had the timing done. I blame the cat for not allowing me to crack 600 per tank like she used to.
Ignition timing, cam timing, stuffed transmission etc all can cause high fuel consumption....looks like you are on the right track though to drop 3L/100km's
Just did that NZinAUS, it kind of make a sound like hitting a big tin can with its lid on. I could hear a small rattle too when I hit it in one place too. That help?
The rattle would indicate that your cat is collapsed inside. It's quite easy to tahe off the cat. From memory there is 4 13mm bolts - 2 on the manifold and 2 after the cat. Take the cat off and youll probably find bits of grey chalky stuff fall out in chunks.
I'm having similar probs.
I have 3.9L CFI.
Replaced :
1. Air filter
2. Fuel Filter
3. Oil Filter, changed oil
4. New plugs
5. Replaced Cat with one from AU Falcon ( less than 60,000km from wreckers $45)
6. Had Diagnostic done by Ultra Tune, timing was way out, all sensors checked out fine. They recommend Injector Clean, but wouldn't a blocked injector make it use less fuel and just run bad?
Power wise it runs quiet smooth, it lacks pick up compared to my brothers EA and my mates EB. But as read in an other post could be due to Trany.
Fuel economy still the same as before about 450km/tank. I think that's about 15.5L/100km. i went to my local Ford Mechanic and he claims that's good (don't know what drugs he's on).
90% off my driving is Hwy, think I should be getting a bit better economy.
Any more suggestions from anyone.
According to paper work that came with the car when I bought it in June :
1. Motor replaced with Recon. May 1999
2. Gearbox and Diff replaced with Recons Feb. 2002
Just had my mechanic look at the car and the dissy cap/rotor button is fine, timing was done with the engine tune when i got it and catalytic converter is working fine. So that doesn't leave many options, just an hour or 2 ago i reset the computer and I will do a fuel consumption test at the suggestion of the mechanic. Current thinking is that the fuel guage is out of wack. I will know exactly how much fuel it is using by this time tomorrow.
9L per 100ks on the highway, but that was after i got stuck behind a little old lady, having a ciggy, crawling along at 80 in a 100 zone in her hyundai Excel for quite a few kays. I'm pretty confident i could have done 7-8L per 100ks if i could hold onto fourth gear for longer.
My problem is with the fuel guage which is being dodgey.
Did the ECU reset thing, a couple of weeks ago. I get about 500km per tank now. Gonna replace dizzy rotor and cap, also leads when I get some cash. Also gonna go to the wreckers and pinch me another ECU. Since doing the reset the fuel gauge has also kind off reset itself, now seems i'm getting about 300km out of first 1/2 off tank and then it takes a nose dive.
You can get injectors cleaned, has your car got high mileage? Injectors with time, don't seal of very well and leak? simple test Disconnect all injector wiring after have the car running 4 a bit, with all injector wiring unplugged, try and start the car, if it runs a bit the injectors are leaky.
Engine condition,
worn rings, burnt valves
throttle body clean?
all fluids good
ignition leads resistance
spark strength from ECU
sensors checked
Cracked vucumm hoses
carboned up valves
exhaust back pressure, as mentioned cat converter
Transmission condition
wheel and tyre size, pressure
tight belts, use of air con, dodgy power steering
bearings in alternater,
Fuel leaks?
Fuel pump, a mate of mine put a V8 one in his commodore because it was cheap, wrong decision.
BRAKE DRAG a common problem
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