Isuzu 20LE - Engine Lacks Power

ENGINE DIAGNOSIS (C22NE, 22LE, 20LE) 6-7
Engine Lacks Power
Condition Possible cause Correction
Trouble in fuel system Fuel Pressure Control Valve not
working normally
Replace
Fuel injector clogged Clean or replace
Fuel pipe clogged Clean
Fuel filter clogged or fouled Replace
Fuel pump drive circuit not
working normally
Correct or replace
Fuel tank not sufficiently breathing
due to clogged Evaporative
Emission Control System circuit
Clean or replace
Water in fuel system Clean
Inferior quality fuel in fuel system Use fuel of specified octane rating
Engine Control Module supplied
poor voltage
Correct circuit
Throttle Position Sensor cable
disconnected or broken
Correct or replace
Throttle Position Sensor defective Replace
Manifold Absolute Pressure
Sensor not working normally
Replace
Intake Air Temperature sensor not
working normally
Replace
Engine Coolant Temperature
Sensor circuit open or shorted
Correct or replace
Engine Coolant Temperature
Sensor defective
Replace
Engine Control Module defective Replace
Trouble in intake or exhaust
system
Air Cleaner Filter clogged Replace filter element
Air duct kicked or flattened Correct or replace
Ignition failure
-
Refer to Hard Start
Troubleshooting Guide
Heat range of spark plug
inadequate
Install spark plugs of adequate
heat range
Electronic Ignition System with
module
Replace