Fuel Trims acting CRAZY

[Evil1gDsm]

Ok...Here's my situation....My fuel trims are really crazy...My low is at 139.8 Mid 130.8 and High 115.8..I have all the the supporting mods!! I have my AFPR set around 45 Psi and was previously set at 39 psi..Basically stock..I am just trying out somethings..I know 45 psi is really high for a 1g..but hey..it's worth a shot for now...As for boost leaks...I just tested them...and i'm good! I have my AFC2 set at +/- Zero for now...As mentioned before...Trying to figure why my trims are being Crazy to me! Any thoughts or suggestions would be appreciated...Thanks...Dan

 

[spyderturbo007]

Are your O2's cycling at idle?

 

[dnhieu]

i would say your trims are alright unless you are knocking OR they just dont change. if they dont ever move EVEN when you are changing them u might have a bad 02 sensor. a good way to check if your o2 is bad is to log your o2s and if you are daily driving and they are all over the place. its a pretty good sign to tell you that your 02 sensor is bad. plus you will get really bad gas milage

 

[Evil1gDsm]

Sounds like an option...My O2's will move every now and again at idle! It seems like i need to add fuel to make them move at idle! But when i'm driving they are moving. I had just replaced the o2 sensor like 5 months ago...dan

 

[Evil1gDsm]

ok..after a day of trying to figure out my problem...I'm aiming at a bad ECU...I have to add 20% fuel on my SAFC-2 in order to get my o2's to read...If i don't add that amount...and give the car throtle 02's will read but my Fuel-trim 02 will be at 167.1 % which is the 100% max!!! I need some help here guys....Any input would be appreciated...Thanks...Dan

 

[Evil1gDsm]

ok..her's the situation...I scored another ECU to try out in my car! Turns out..The same ####ing problem is happening! So now i'm back to thinking it's something wrong with the 02 sensor..What do you guys think!!...dan