Workshop Manual

6A–7
ENGINE MECHANICAL (6VE1 3.5L)
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
Ion Sensing module faulty Refer or replace
Engine lacks power
Spark plugs fouled Clean
Fuel injectors defective Replace
Mass Airflow Sensor or Intake
Airflow Sensor circuit defective
Correct or replace
Manifold Absolute Pressure (MAP)
Sensor or Manifold Absolute
Pressure Sensor circuit defective
Correct or replace
Engine Coolant Temperature Sensor
or Engine Coolant Temperature
Sensor circuit defective
Correct or replace
Powertrain Control Module faulty Replace
Intake Air Temperature Sensor or
Intake Air Temperature Sensor
circuit defective
Correct or replace
Throttle Position Sensor or Throttle
Position Sensor circuit defective
Correct or replace
ION Sensing Module or ION Sensing
Module circuits defective
Correct or replace