The problem is the PCM thinks that the O2 sensor thinks the A/F is lean, when its not(hence the 11mpg).
The O2 is reporting false info or the wiring from the O2 to the PCM is burggered. False info could be from a bad O2, (but you replaced it) or an exhaust leak. Its too coincidental that this happend after an exhaust change NOT to be caused by a leak.
1) Change your oil as its been soaked with fuel. DO NOT GO WOT until you fix this or you'll be fixing a hell of a lot more real soon.(engine and turbo)
2) Your plugs are probably fuel fouled too and are now causing thier own issues. Clean them or replace them.
3) Scan the O2 voltage at cruise to make sure its switching. It should be flipping from ~2.5v-~3.5v pretty fast.
Whats the LTFT at idle and Cruise?
Whats the O2 voltage ate idle?
4) Be sure to clear your Maxed out LTFT otherwise it will take a while for the PCM to pull out the fuel it has been adding. The Snapon tool or disconnection the battery will do this.
An exhaust leak upstream of the O2 will cause this code. If your pos 3" O2 housing is leaking, that would do it. Look for black carbon tracking around the flange.
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"Just because someone goes fast doesn't mean you should do whatever you think they did.
This path assumes they knew what they were doing, which isn't necessarily the case"..........RB Racing
Last edited by duster360 : 09-30-2009 at 03:30 PM.
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