HELP !! Fuel/boost cut

  • Brenton31z
    Brenton31z
    Junior Member
    • 13

    #16
    Correct They are the only mods. I just replaced the fpr the PO had in there with a turbosmart 800
  • Brenton31z
    Brenton31z
    Junior Member
    • 13

    #17
    I don’t have a stock fpr
  • Wilsonthesphere
    Wilsonthesphere
    Senior Member
    • 208

    #18
    Other than the fuel cut the car idles and run fine in vacuum? Have you checked the POV? I would just put a cap from the NA or pipe fitting if possible.
    Own:
    1986 Z31 2+0 Turbo GLL ---- spearco IC ,3" exhaust, Poly everything with solid subframe and diff mounts, HX35/40 Holset Turbo, CLSD, Nistune with 1220cc FIC injectors on E85.
    1993 Jeep Cherokee 4X4
    Owned:
    1995 Z32 2+0 NA Black
    1985 Z31 2+0 turbo Black
    1986 Z31 2+0 NA Red
    1988 Z31 2+2 NA Auto
    1988 Z31 2+0 Turbo White ---- Stripped for all of its goodies.
    1984 Z31 2+0 turbo Brown
    1985 Z31 2+0 NA Black
    2003 Nissan frontier D22 supercharded vg33e 4x4
  • Brenton31z
    Brenton31z
    Junior Member
    • 13

    #19
    Car runs fine at idle, I removed the POV and capped I’m still getting this cut. I don’t no what else it could be
  • JSM
    JSM
    Senior Member
    • 279

    #20
    I’m more curious about your symptoms. When you say cuts out and no longer makes boost, does it seem like it just stalls or shuts down or does it continue up into the rpm range and just not make power? I was thinking maybe your waste gate was stuck open. Can you rev the engine under no load through the rpm range? Just blipping the throttle?

    Ive seen many rusty wastegate arms and was wondering if it may be hanging up some.
    Jeff
    71 240z

    80 280zx 10th Anniversary

    88 300zx Turbo, 89 300zx Turbo

    Datsun Jeff
  • Brenton31z
    Brenton31z
    Junior Member
    • 13

    #21
    it just stalls and shuts down but the car does not turn off, once it comes back off pressure/load it will run again. I can rev the engine under no load through the rpm range and it is fine.
  • Wilsonthesphere
    Wilsonthesphere
    Senior Member
    • 208

    #22
    Are you sure your ignition system is in good shape. Good coil and good spark plugs and wires?
    Own:
    1986 Z31 2+0 Turbo GLL ---- spearco IC ,3" exhaust, Poly everything with solid subframe and diff mounts, HX35/40 Holset Turbo, CLSD, Nistune with 1220cc FIC injectors on E85.
    1993 Jeep Cherokee 4X4
    Owned:
    1995 Z32 2+0 NA Black
    1985 Z31 2+0 turbo Black
    1986 Z31 2+0 NA Red
    1988 Z31 2+2 NA Auto
    1988 Z31 2+0 Turbo White ---- Stripped for all of its goodies.
    1984 Z31 2+0 turbo Brown
    1985 Z31 2+0 NA Black
    2003 Nissan frontier D22 supercharded vg33e 4x4
  • mwolvinm
    mwolvinm
    Senior Member
    • 249

    #23
    I’m thinking it is fuel related based on the pressure readings from the gage. Could there be a restriction in the fuel line somewhere that restricts flow? I’m thinking a crushed fuel line, clogged filter, or gummed up sock in the tank.

    My my thought is that you arent getting the flow you wed to the injectors to support the fuel needed on boost.
    --------------
    Legal stuff:
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    Any information shared is simply my own opinion and NOT the opinion of Nissan

    not legal stuff:
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    '22 Q60RS-- I tell the wife it's hers…
    '87 Chaparral bowrider-- the next project
    '00 Corolla-- kids car.
    '14 E-350-- Gotta haul those kids in something.