I have a little problem... Since the valve springs #105 and the intercooler S2 are installed i have 3 check engine codes
P0101 : Mass Air Flow (MAF) Circuit Range/Performance Problem. I changed the MAF but the problem re-appear.
P0131 : Oxygen O2 sensor circuit low voltage (Bank1 Sensor 1).
P0300 : Random misfires. According to this : OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected and what my automobile mechanic it's seem there an problem with the Fuelab ajustable regulator. He told me usualy the pression is suppose to stay stable for a while after i stop my car but now after just a few minutes the pressure drop down.
My symptoms : A lot of variation in the RPM when the engine is cold (between 0 RPM that mean the car stall and over 3000 RPM. When the engine is at normal temperature it's more between 400RPM and 1200 RPM.
Will overkill answer me :
I believe the MAF and o2 are on the same fuse. Is the fuse ok?
The pressure dropping off is normal in the fuel rails. Ensure the pressure is set to 50psi with the vacuum line disconnected.
- Will
Where is that fuse?
