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Old 10-06-2012, 11:52 AM   #1
Scooby Newbie
Member#: 314303
Join Date: Mar 2012
Question sti 2007 rough start/ hesitation


I search to find my problem but not find

The problem begin after i got tuned
Im not sure but im think its a scaling issue

cobb sf intake
injector 650cc dw
fuel pump dw

The car start fine at cold but when i come to start when the car is hot, the car shake a lot and run really rich 11:1-11.5:1 afr
If i give a little gaz . the car come back to normal 14:5:1afr

The car have alose a little hesitation between 2000-3000rpm BUt not Always
And i can read lean on this spot (15-16:1afr)

But at wot, the car have not hesitation

its like a bad o2 sensor, but i change it 800mile ago

please if you can help me...
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kev20 is offline   Reply With Quote