All of a sudden my cars running super lean only when I get into boost.I've put a new o2 in it,no exhaust leaks,boost and vacuum has not been affected.new fuel filter,fuel pressure is at 60 psi running.can the maf read wrong with out throwing a code? What about the back o2? I'm at a loss.

 

Bump

 

......

 

The back o2 doesnt matter. i dont have one and its tuned out thats how i know. have you sent a log to vince to see what he says? bad batch a gas? vids? lol

 

Maybe u have a bad evap purge solenoid?

Also clean the tb

 

Happened on the same tank of gas.I have not tried the solenoid although I thought about it.my back o2 isn't tuned out.just p0420 is disabled.

 

Tb was just cleaned

 

Test the solenoid by removing it and blowing on it. If u. Can get air to flow out through its other end then its bad.

 

Also check the oil dipstick. Believe it or not those things trigger lean code when not sitting properly , and know it from experience lol

 

I have a spare in my trunk.ill check both though.hopefully that's it.thanx for the input.

 

Another thing u might want to check is for boost leaks, or exhaust leaks . I had a cracked exhaust manifold giving me lean code problems a month ago..

 

People say u can spray carb cleaner on vaccum lines and intake mani to see if there is a leak. If there is a leak the car will accelerate a little. Good luck man

 

There are no vacuum/boost leaks.evap solenoid is fine...no lean code.wideband is reading really lean and would cut out from being so lean

 

Any more ideas?

 

Maybe your wideband isnt reading properly

 

I wish it was that simple but when it shows lean it falls on it face,so its accurate.

 

Replace the solenoid and post results.

 

I disconnected it and same thing.it holds vacuum/ boost.ill change it any way but I'm not expecting it to be bad.

 

Have yet to figure it out.triple checked for vacuum leaks.guess its time to throw parts at it.I'm going to try maf and map 1st.if not it then oh well then it has new sensors.just makes no sense.I deleted the evap for a couple pulls and no change.

 

Injector issue?

 

I would think if it was injector,it would do it even cruising.I don't know.I'm going to go over everything again to make sure I didn't miss anything.