View Single Post
Old 06-30-2019, 12:48 PM   #2 (permalink)
herp derp Apprentice
Join Date: Oct 2008
Location: Lawrence, KS
Posts: 1,044

Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

Yukon - '03 GMC Yukon Denali
90 day: 13.61 mpg (US)
Thanks: 43
Thanked 322 Times in 229 Posts
I don’t have much Ford specific experience, mainly Gm. A lot of vehicles seem to be able to adjust the long term fuel trim +/- 25% and short term +/- 25%. Problem is I think most will set a rich or lean code once the long term is off 20-24%. So the vehicle may be able to correct 50%, you may be stuck with a check engine light if you’re holding over 20%. It may be fine, aside from the light, while in closed loop, but I’d guess you’d be dumping extra fuel whenever you’re in open loop. Making the change for mileage, I’d be scared of going to a higher flow.
  Reply With Quote
The Following User Says Thank You to 2000mc For This Useful Post:
hat_man (06-30-2019)