spark Knock 1990 chevy pickup?

  • Thread starter Thread starter DLW+
  • Start date Start date
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DLW+

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4.3 motor, it spark knocks only after the motor warms up. Have changed plugs, wires, cap, rotor, checked pickup coil, replaced module in distributor. Has a new ECM module, timing ok, fuel pump checks out, have put injector cleaner in gas. have ran tank empty in case of water in fuel. new fuel filter, Help please,
 
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