Fuel component failure ? - pretty specific symptoms...

[kengeroo]

So I like to tweak my fuel map to get better fuel mileage... (never tweak any boost area, just cruising)...

This weekend I was dialing in idle and cruise area to get to the 14.7 magic... All was good...

the next day at idle everything seems to be fine,,, but as soon as i touch the throttle (I mean just touch it), the AFRs drop below 10 and runs like crap..

It happen all of the sudden and is still happening...

Anyone have any idea on what could have failed ?

thx2014-07-29 07.33.54.jpg

[bobbo]

How does it react while driving or off idle and you hit the throttle?
Adjust your TPS to around .51. .46 is too low.
Also looking at pictures upside down is annoying.

[kengeroo]

BTW --- this is all with O2 sensor offline,,, in the past AFRs waas all good with the O2 offline

driving ,, on decel,,, of course it goes lean,,,
as soon as I touch the throttle again goes super duper rich...

again... this just started happening one morning..

[bobbo]

Dunno about your tuner but mine said to leave o2 feed back on. After all that's what controls your idle.
There is a setting (for the life of me I can't remember what its called) that does add extra fuel when you hit the throttle to compensate for the fact that air travels faster than fuel. Throttle enrichment perhaps? That setting may have been inadvertantly changed.
Sorry I can't give you a more definitive answer.

[kengeroo]

yes I do usually have the O2 sensor on,,, but what if it failed???

you want the Fuel map accordingly ???

thing is ,,, one day my car is running with O2 sensor offline.,.. like it was online....

next day it's running superman/bill gates rich

wondering what component could fail to cause this ???