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Old 11-11-2002, 02:37   #1 (permalink)
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Question Fuel consumption problems

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?
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Old 11-11-2002, 03:10   #2 (permalink)
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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.
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Old 11-11-2002, 04:02   #3 (permalink)
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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
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Old 11-12-2002, 12:30   #4 (permalink)
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Blocked catalytic converter.
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Old 11-12-2002, 14:44   #5 (permalink)
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Park the car, put the hand brake on and reach undrr and give the cat a thump with your fist. Tell us what sound it makes.
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Old 11-13-2002, 20:13   #6 (permalink)
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Quote:
Originally posted by NZinAUS
Park the car, put the hand brake on and reach undrr and give the cat a thump with your fist. Tell us what sound it makes.
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?
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Old 11-14-2002, 02:15   #7 (permalink)
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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.
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Old 11-25-2002, 20:06   #8 (permalink)
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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
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Old 12-05-2002, 03:25   #9 (permalink)
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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.
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Old 12-06-2002, 00:49   #10 (permalink)
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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.
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