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 Fill up, LTFTs super rich. What's up?

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Name : Aaron
Age : 40
Location : C-bus, Ohio
Joined : 2007-01-13
Post Count : 18332
Merit : 240

PostSubject: Fill up, LTFTs super rich. What's up?   Sun Oct 14, 2007 1:16 pm

Every time I fill up with a full tank, my LTFT numbers go from near 0 to -22. This lasts for a few minutes, or until the next time I start the car. Anyone know why this happens? Good news is, things do go back to normal eventually. Thoughts?

'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO 85k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun

'70 Olds Ninety-Eight Holiday Coupe 116k miles 455 Rocket V8
Because cool

'95 Celica 152k miles 0-60: yes
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Name : Rob
Age : 35
Location : ohio
Joined : 2007-03-05
Post Count : 422
Merit : 0

PostSubject: Re: Fill up, LTFTs super rich. What's up?   Sun Oct 14, 2007 10:42 pm

maybe has something to do with the evap/purge system pumping fumes back into your car??
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Name : Derek
Age : 46
Location : Reading, MA
Joined : 2007-01-31
Post Count : 7717
Merit : 109

PostSubject: Re: Fill up, LTFTs super rich. What's up?   Sat Nov 03, 2007 9:49 pm

Could be the colder, denser fuel as it comes out of the ground. The liquid eventually comes up to ambient temp and functions normally.
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