Welcome to the Australian Ford Forums forum.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and inserts advertising. By joining our free community you will have access to post topics, communicate privately with other members, respond to polls, upload content and access many other special features without post based advertising banners. Registration is simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact us.

Please Note: All new registrations go through a manual approval queue to keep spammers out. This is checked twice each day so there will be a delay before your registration is activated.

Go Back   Australian Ford Forums > Club and Speciality Forums > Forum Community Car Clubs > AU Falcon.com.au

Reply
 
Thread Tools Display Modes
Old 13-12-2020, 08:48 PM   #1
Aussie Falcon
FF.Com.Au Hardcore
 
Aussie Falcon's Avatar
 
Join Date: Jan 2005
Location: NSW
Posts: 579
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
Aussie Falcon is offline   Reply With Quote Multi-Quote with this Post
Old 14-12-2020, 08:15 AM   #2
Peter B - CV8
FF.Com.Au Hardcore
 
Join Date: Sep 2005
Posts: 1,380
Default Re: AU1 Fairmont high fuel consuption

What's the average speed reading that accompanies that fuel usage ??
Peter B - CV8 is offline   Reply With Quote Multi-Quote with this Post
Old 14-12-2020, 08:58 AM   #3
Aussie Falcon
FF.Com.Au Hardcore
 
Aussie Falcon's Avatar
 
Join Date: Jan 2005
Location: NSW
Posts: 579
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
Aussie Falcon is offline   Reply With Quote Multi-Quote with this Post
Old 14-12-2020, 04:55 PM   #4
falconhell74
FF.Com.Au Hardcore
 
falconhell74's Avatar
 
Join Date: Jul 2011
Location: Serpentine W.A.
Posts: 1,639
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
__________________
XC GS OLD SCHOOL MUSCLE

Audi A4 S-line quttro
Xc falcon
Previous fords-
xc falcon 500 ,250 x flow 3 speed
xc gs worked 250 x flow 4 speed
xa Fairmont 302 auto wagon
xb falcon 250 log auto 4 door
xb falcon 200 log auto ute
xc gs project - had to sell :-(
xc gs 302 4 speed 4 door
xc gs 351 auto 4 door
zf fairlane 302 auto
zk fairlane 250 x flow carb auto
zl fairlane 250 x flow EFI auto
xg ute , BA falcon dedicated gas
xd, xf x 3 ,ea,eb,ef,au x 3,telstar tx5
falconhell74 is offline   Reply With Quote Multi-Quote with this Post
2 users like this post:
Old 15-12-2020, 08:15 AM   #5
Peter B - CV8
FF.Com.Au Hardcore
 
Join Date: Sep 2005
Posts: 1,380
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.
Peter B - CV8 is offline   Reply With Quote Multi-Quote with this Post
This user likes this post:
Old 21-12-2020, 07:47 PM   #6
Aussie Falcon
FF.Com.Au Hardcore
 
Aussie Falcon's Avatar
 
Join Date: Jan 2005
Location: NSW
Posts: 579
Default Re: AU1 Fairmont high fuel consumption

Thanks for the advice
Aussie Falcon is offline   Reply With Quote Multi-Quote with this Post
Old 21-12-2020, 08:36 PM   #7
Uncle_Ken
Next upgraded Mk1 Leopard
 
Uncle_Ken's Avatar
 
Join Date: Jan 2005
Location: Sydney, in the burbs
Posts: 4,913
Valued Contributor: For members whose non technical contributions are worthy of recognition. - Issue reason: Always putting some imput into the forums to help or make it a bit easier for others Tech Writer: Recognition for the technical writers of AFF - Issue reason: Writing tech articles 
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
UK
__________________
Plastic Surgery 1 AUII Monsoon Blue
Plastic Surgery 2 AUIII XR8 220 Rebel
Plastic Surgery 3 Watch this space ??? Living in AU Heaven
How 2's: Change rear view mirror, Install backfire valve, Change foam front seats, Install auto transmission cooler, Replace Trans Shift Globe, Remove front door Trim, Paint AU headlights, install door spears, Premium Rear Parcel Shelf, go here...
Uncle_Ken is offline   Reply With Quote Multi-Quote with this Post
Reply


Forum Jump


All times are GMT +11. The time now is 03:44 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Other than what is legally copyrighted by the respective owners, this site is copyright www.fordforums.com.au
Positive SSL