issues! Lean...rich???

[Holvinator]

Looking at the Wideband shows that on iddle sits @ mid-14's up to high 15's. Sometimes it stays at 13.9.

When flooring it it sits at mid 12's through high 13's...

*** At night when its colder outsite car runs like crap. It accelerates super slow & sometimes car shakes + lots of back-firing.

*** During the day car runs a lil better, accelerates better but it hesitates when accelerating. Feels like something its holding it back sence its boosting fine "7psi".

WONDERING WHERE DOES NUMBERS SHOULD BE HITTING AT WHEN CAR SITS AT IDDLE, & WHEN U FLOOR IT

***CHECKED MY SPARKPLUGS AND TIP ITS GREY***

Any input will be appreciate it. Thanks

[compactfean]

Cruising afr should be anywhere from 14.0 to 15. Wot on a turbo vehicle should be 11 to 11.7 ish. You are running way lean under boost. idle should be around 14.5 -14.7 however some engines idle better with a richer afr. What do you have as far as tuning?

[Holvinator]

I have RS Enthalpy

[compactfean]

Get a cheap fuel gauge and monitor your fuel pressure when under wot. For every lbs of boost you should have a lb of fuel pressure.

[Holvinator]

sorry man but what its WOT? lol and also what am I trying to find by doing this? write some examples here lol.
I might b doing this this weekend but need to know whats the outcome of this : )

[compactfean]

Wide Open Throttle. Wot. What you are looking for is if your fuel pressure is dropping off or flat lining under boost. Example. Base fuel pressure is 43 psi, engine under vacuum is around 35 psi. When you start to boost.....lets say 10 lbs for easy math, your fuel pressure should be at 53 psi. If at 10 psi of boost you are only seeing 49 than that means your fuel pump cannot keep up with the demand of your engine (or your fpr its bleeding off, but usually not the case.) Which will cause such lean conditions.

[Holvinator]

Ok I found what the problem was... friking knock sensor : / they guy who tunned my car he disable using his software and car started running nice. Now I gotta buy a knock sensor, install it, then take it back to him so he can enable it on the ECU.

By the way which knock sensor do I need to get? Sentra Sr? a KA?

now the issue that Im having its that when I beat the crap out of my car and I release gas pedal it starts to back firing like a machine gun and it wont stop till it does a big BoOm at the end hahaha. is it timming issues?