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6A–7 ENGINE MECHANICAL Condition Correction Possible cause Others Engine lacks compression Refer to “Hard Start” Valve incorrectly seated Lap valve Air Cleaner Filter clogged Replace filter element Valve timing incorrect Readjust Idle air control valve broken Replace Fast idle solenoid defective Replace Positive Crankcase Ventilation valve Replace Rough Engine Running Condition Possible cause Correction Engine misfires periodically Ignition coil layer shorted Replace Spark plugs fouling Clean or install hotter type plug Spark plug(s) insulator nose leaking Replace Fuel injector(s) defective Replace Powertrain control module faulty Replace Engine knocks periodically Spark plugs running too hot Install colder type spark plugs Powertrain control module faulty Replace Engine lacks power Spark plugs fouled Clean Fuel injectors defective Replace Mass Airflow Sensor or Intake Correct or replace Manifold Absolute Pressure (MAP) Correct or replace Engine Coolant Temperature Sensor Correct or replace Powertrain Control Module faulty Replace Intake Air Temperature Sensor or Correct or replace Throttle Position Sensor or Throttle Correct or replace Knock Sensor or Knock Sensor Correct or replace Knock Sensor Module or Knock Correct or replace |