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p0303

  1. P0303, SES flash, cylinder #3 misfire

    262ci Forum (4.3)
    Replaced distributer cap and rotor as well as plugs and wires, did not change a thing. Tested for spark from cap and wire and plug all spark is good. Did compression test, all cylinders read at 150 within 3 cranks. Compression is good and spark is good so I’m replacing the injector with the...
  2. P0303 cylinder 3 misfire after engine swap

    262ci Forum (4.3)
    I have a 2000 s10 zr2 blazer with the 4.3L Vortec Only code is P0303 Due to low pressure issues and backfiring I picked up the engine and transmission out of a 80k mile 2000 gmc jimmy and my father and I swapped both in. We replaced all spark plugs and plug wires, new cap and rotor, complete...
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