Isuzu 1999 RODEO Workshop Manual page 515

6A–6 ENGINE MECHANICAL (X22SE 2.2L)
Rough Engine Running
Condition
Engine misfires regularly
Engine knocks regularly
Engine lacks power
Possible cause
Ignition coil layer shorted
Spark plugs fouling
Spark plug(s) insulator nose leaking
Fuel injector(s) defective
Engine control module faulty
Spark plugs running too hot
Powertrain control module faulty
Spark plugs fouled
Fuel injectors defective
Manifold Absolute Pressure (MAP)
Sensor or Manifold
Pressure Sensor circuit defective
Engine Coolant Temperature Sensor
or Engine Coolant Temperature
Sensor circuit defective
Engine Control Module faulty
Intake Air Temperature Sensor or
Intake Air Temperature
circuit defective
Throttle Position Sensor or Throttle
Position Sensor circuit defective
Knock Sensor or Knock Sensor
circuits defective
Knock Sensor Module or Knock
Sensor Module circuits defective
Correction
Replace
Clean or install hotter type plug
Replace
Replace
Replace
Install colder type spark plugs
Replace
Clean
Replace
Correct or replace
Absolute
Correct or replace
Replace
Correct or replace
Sensor
Correct or replace
Correct or replace
Correct or replace