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Old 13-12-2020, 08:48 PM   #1
Aussie Falcon
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Default AU1 Fairmont high fuel consumption

Hi,

I need help trying to solve a high fuel consumption problem on a 1999 6 Cyl AU1 Fairmont.

Driving is usually in the city with short trips and it's averaging 21L/100.
It's usually driven gently. I've tried 98 or 91 petrol and econ mode with little difference

The car drives and runs smoothly. There is a petrol\strong exhaust smell when car is cold on start up. Only modifications are\were a K&N filter and an XR6 intake scoop

The following have been replaced in recent months

Center and rear mufflers (due to corrosion)
new standard Air filter (was a K&N)
Coolant Temp sensor
6x new fuel injectors
new fuel pressure regulator
new inlet manifold gasket (leak was found)
new oxygen sensor
new idle control valve

Fuel filter was checked. Last replaced 2 years ago
spark plugs are about 5 years old

The car is in mint condition with low KMs and doesn't do more that 5k per year

what are the next steps?

Thanks
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Old 14-12-2020, 08:15 AM   #2
Peter B - CV8
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Default Re: AU1 Fairmont high fuel consuption

What's the average speed reading that accompanies that fuel usage ??
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Old 14-12-2020, 08:58 AM   #3
Aussie Falcon
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Default Re: AU1 Fairmont high fuel consuption

Quote:
Originally Posted by Peter B - CV8 View Post
What's the average speed reading that accompanies that fuel usage ??
sadly the Avg is 20km/hr.
It is only used for trips to the shops or Gym
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Old 14-12-2020, 04:55 PM   #4
falconhell74
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Default Re: AU1 Fairmont high fuel consumption

Possibly a partially blocked cat converter and I would replace those spark plugs unless they are iridium or platinum plugs
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Old 15-12-2020, 08:15 AM   #5
Peter B - CV8
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Default Re: AU1 Fairmont high fuel consuption

Quote:
Originally Posted by Aussie Falcon View Post
sadly the Avg is 20km/hr.
It is only used for trips to the shops or Gym
There's your answer. The car is spending the majority of it's time in the most uneconomical gears/speed/idling at lights etc.
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Old 21-12-2020, 07:47 PM   #6
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Default Re: AU1 Fairmont high fuel consumption

Thanks for the advice
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Old 21-12-2020, 08:36 PM   #7
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Default Re: AU1 Fairmont high fuel consumption

City drive in my old AU II 310 kms from a tank for me. 340 in a good week
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