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6A–6 ENGINE MECHANICAL Rough Engine Idling or Engine Stalling Condition Possible cause Correction Trouble in fuel injection system Idle air control valve defective Replace Throttle shutting off incomplete Correct or replace Throttle position sensor circuit open Correct or replace Fuel injector circuits open or shorted Correct or replace Fuel injectors damaged Replace Fuel pump relay defective Replace Mass Airflow Sensor circuit open or Correct or replace Mass Airflow Sensor defective Replace Manifold Absolute Pressure Sensor Correct or replace Manifold Absolute Pressure Sensor Replace Engine Coolant Temperature Sensor Correct or replace Engine Coolant Temperature Sensor Replace Intake Air Temperature sensor circuit Correct or replace Intake Air Temperature sensor Replace Knock Sensor (KS) cable broken or Correct or replace KS defective Replace KS Module circuits open or ground Correct or replace KS Module defective Replace Vehicle Speed Sensor circuit open or Correct or replace Vehicle Speed Sensor defective Replace Trouble in emission control system Powertrain Control Module defective Replace Exhaust Gas Recirculation Valve Correct or replace Exhaust Gas Recirculation Valve Replace Canister purge valve circuit open or Correct or replace Canister purge valve defective Replace Evaporative Emission Canister Replace Trouble in ignition system Refer to “Hard Start” |