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EST Code???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Philly87, Jul 26, 2000.

  1. Philly87

    Philly87 1/2 ton status

    Jul 14, 2000
    Likes Received:
    El Paso, TX
    I have an 87 Blazer with a fuel injected 350 in it. The motor isn't stock but everything should work well with the stock computer including the cam. Sometimes the beast runs like a dream and other times it seems to have no power. The computer gives me both an EST (Electronic Spark Timing) and a lean exhaust code. I'm assuming the lean exhaust is due to the dual exhaust but I cant figure out the EST. Any suggestions?? I appreciate any input!!
  2. 87 mid canada k5

    87 mid canada k5 1/2 ton status

    Jul 20, 2000
    Likes Received:
    Winnipeg Manitoba Canada
    i ve got an 87 with a 305 and switched over to duals with no lean exhaust code, i'm not a certified wrencher , but i believe the o2 sensor is what's reading your exhaust. mine is located on the drivers side exhaust manifold , so i would assume that going to dual exhaust shouldn't change the volume of smog it's tasting, mine's been ok for three years , i'm not running a cross-over tube. as for the est well i dunno! good luck!!

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