misfire under boost

  • #1

    misfire under boost

    So basically ive been having a problem ever since i got my car started again about 1 month ago. so i first figured out that it would start to miss after it would warm up or after like 5 minutes. it misses when it idles and when it takes off in low rpms. next is that right when you get into boost it starts to miss, and the higher you get into boost the more it will misfire. black smoke also spits out of the exhaust when missing in boost.
    ive replaced the plugs, wires, tps, and maf.
  • #2
    Sounds like a vacuum/boost leak. Check everywhere it might leak.
    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