Abnormal Combustion - Isuzu C22NE Workshop Manual

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 (If applicable)
Heated Oxygen Sensor defective
(If applicable)
Signal vacuum hose loosely fitted
or defective
ECT Sensor circuit open or
shorted
ECT Sensor defective
Evaporative Emission Control
system (If applicable)
-
Carbon deposits in combustion
chamber
Carbon deposit on valve, valve
seat and valve guide
ENGINE DIAGNOSIS (C22NE, 22LE, 20LE) 6-11
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
Correct or replace
Replace
Refer to Section 6E
Refer to "Engine Lacks Power"
Remove carbon
Remove carbon
Correction