Isuzu 1999 RODEO Workshop Manual page 521

6A–12 ENGINE MECHANICAL (X22SE 2.2L)
Abnormal Combustion
Condition
Trouble in fuel injection system
Trouble in emission control system
Trouble in ignition system
Trouble in cylinder head parts
Possible cause
Fuel pressure control valve defective
Fuel filter clogged
Fuel pump clogged
Fuel tank or fuel pipe clogged
Fuel injector clogged
Fuel pump relay defective
Power supply cable for fuel pump
loosely connected or defective
Manifold Absolute Pressure Sensor
circuit open or shorted
Manifold Absolute Pressure Sensor
defective
Engine Coolant Temperature (ECT)
Sensor circuit open or shorted
ECT Sensor defective
Throttle Position Sensor adjustment
incorrect
Throttle Position Sensor defective
Throttle Position Sensor connector
loosely connected
Vehicle Speed Sensor cable loosely
connected or defective
Vehicle Speed Sensor loosely fixed
Vehicle Speed Sensor in wrong
contact or defective
Engine Control Module cable loosely
connected or defective
Heated Oxygen Sensor circuit open
Heated Oxygen Sensor defective
Signal vacuum hose loosely fitted or
defective
Exhaust Gas Recirculation Valve
defective
ECT Sensor circuit open or shorted
ECT Sensor defective
Evaporator system
————
Carbon deposits in combustion
chamber
Carbon deposit on valve, valve seat
and valve guide
Correction
Replace
Replace
Clean or replace
Clean or replace
Clean or replace
Replace
Reconnect, correct or replace
Correct or replace
Replace
Correct or replace
Replace
Reconnect
Replace
Reconnect
Correct or replace
Fix tightly
Replace
Correct or replace
Correct or replace
Replace
Correct or replace
Replace
Correct or replace
Replace
Refer to Section 6E
Refer to "Engine Lacks Power"
Remove carbon
Remove carbon