Hi guys and girls! I'm new to the forum but have used it a bit for info and now I'm here for help. I have a 2004 V8 Treg. Here's a little prerequisites to my problem that I have now.
1. First thing that went bad was my mechanical brake vac boost pump- replaced with good used from a VW V8
2. Right side (transfer pump) fuel pump went out- replaced with aftermarket new pump
3. Left side fuel pump goes out-replaced with new aftermarket pump
Now no codes or problems occured for about 2 months
I get codes
P0174- Fuel Trim; Bank 2: System Too Lean
P0171- Fuel Trim; Bank 1: System Too Lean
So now I decide to replace the MAFs with aftermarket (non-Bosch)
These two codes go away and after a few drive cycles I get:
P1128- Fuel Trim; Bank 1 (Mult): System too Lean
P1130- Fuel Trim; Bank 2 (Mult): System too Lean
P1479- Brake Boost Vacuum System: Mechanical Failure
So now I check fuel pressure again. Pressure with Key on Ignition off I get about 2bar or 28-30PSI (My gauge is of the cheap harbor freight kind), when it should be 3-4bar which is about 50-60psi. The gauge setup is not tee'd off, I didn't have a tee to use so the gauge is at the end of the pressure line.
Volume out of each side is JUST under 800ml in 15sec and according to ELSA it must be a minimum of 800ml in 15sec. ELSA states that if volume is under, it must be a fuel filter problem, but once again I replaced it with a brand new VDO and fuel pressure regulator.
The brake vac pump does come on and run, you can even see the lines move a bit and the lines are fine with no breaks. However, I have noticed that my pedal goes pretty far to the floor.
So what am I missing? I love my Treg but I'm about to pull my hair out over this one!