A/F running lean

[TSI92TALONAWD]

I have a 1992 talon tsi that start running lean today, wideband saying 14:1. I check my fuel pressure and it was reading 120psi and my regulator. I have a stock motor/stock turbo with apexi turbo back exhaust, Walbro 255 pump, SAFC-2, 2g mass sensor. Tried turnin up the fuel threw the SAFC but it still ran lean. Does anyon have a clue what it goin on? Could my fuel pressure regulator be out of wack or my 2g mas not workin right. Any input would be appreciated.

 

[16g DSM]

WTF 120 psi!?! WTF i would say that either you have a fuel pump from god or your fuel pressure regulator is out of wack. not sure if thats your issue but you shouldn't be at 120 psi! Try turnning it down to where it should be at !

 

[TSI92TALONAWD]

ya that's what i thought too haha, tryin turnin it down on the regulator and around 80 psi (accordin to the gauge) the car dies.

 

[steve]

Your gauge is broken.

The relief valve in most fuel pumps opens at about 70-80psi so it's almost impossible for you to have 120 psi fuel pressure. Get another gauge and depending on if your an automatic or manual set the pressure for either 42.7psi (ATX) or 36.3 (MTX) with the pressure reference disconnected at idle.

 

[BoxheadTim]

Given that a 1g runs somewhere around 40psi stock I would also vote for a broken gauge. Running at 120psi over intake manifold pressure would most likely do interesting things to your mixture, but running lean is most likely not one of them.