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6-4 ENGINE DIAGNOSIS (C24SE, C22NE, 22LE, 20LE) 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 Correct or replace Fuel injector circuits open or Correct or replace Fuel injectors damaged Replace Fuel pump relay defective Replace Manifold Absolute Pressure Correct or replace Manifold Absolute Pressure Replace Engine Coolant Temperature Correct or replace Engine Coolant Temperature Replace Intake Air Temperature sensor Correct or replace Intake Air Temperature sensor Replace Knock Sensor (KS) circuits open Correct or replace KS defective Replace KS Module circuits open or ground Correct or replace KS Module defective Replace Vehicle Speed Sensor circuit open Correct or replace Vehicle Speed Sensor defective Replace Trouble in emission control Engine Control Module defective Replace Canister purge solenoid circuit Correct Canister purge solenoid defective Replace Evaporative Emission Canister Replace Trouble in ignition system Refer to Hard Start 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 |