O2 pegged lean.....

[buRn-AWD]

ok...i have an autometer O2 guage, and i replaced the sensor a month ago, my boost is at roughly 12.5-13 and it'll spike to 15 or 16 when the wastegate opens. i have a hacked MAS and was wondering if it could create the lean condition. I currently lack a datalogger, but am pretty sure i shouldnt be running lean at 12.5 psi. THe guage seems to work well, It "cycles" when cruising etc. It stays pretty Rich/stoich for hte most part, but under high rpm's it gets increasingly leaner.....any help please.....

 

[GSntncT]

I'm going through the same thing right now....let me know what happens.

 

[nine5raptor]

Originally posted by buRn-AWD
i have a hacked MAS and was wondering if it could create the lean condition.

Depends on what you did when 'hacking'. Most likely this is why you are lean.


What does your knock look like on the logger?
fuel trims?

 

[buRn-AWD]

Originally posted by buRn-AWD
. I currently lack a datalogger, but am pretty sure i shouldnt be running lean at 12.5 psi.

i dont have one right now, its on the things to get list....but i "hacked" the lower honeycomb as i read it was a common "free mod" that wouldnt really affect it. but, I just recently read that hacking the MAS will create a lean ratio. I"m not positive that this is the case, but i plan to check the voltage at the fuel pump to make sure everything is ok...