2004 ISUZU TF SERIES Workshop Manual

Page 1833 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL (6VE1 3.5L)  6A-9 
Symptom Possible Cause  Action 
Hesitation at high speeds  Engine Control Module defective Replace 
 Throttle Position Sensor cable broken 
or poor connections Cor

Page 1834 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A-10  ENGINE MECHANICAL (6VE1 3.5L) 
Engine Lacks Power 
Symptom Possible Cause  Action 
Trouble in fuel system  Fuel Pressure Control Valve not 
working normally Replace 
 Fuel injector clogged Clea

Page 1835 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL (6VE1 3.5L)  6A-11 
Symptom Possible Cause  Action 
Engine overheating  Level of Engine Coolant too low Replenish 
 Fan clutch defective Replace 
 Thermostat defective Replace 
 Engi

Page 1836 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A-12  ENGINE MECHANICAL (6VE1 3.5L) 
Engine Noisy 
Abnormal engine noise often consists of various noises
originating in rotating parts, sliding parts and othe
r
moving parts of the engine. It is, th

Page 1837 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL (6VE1 3.5L)  6A-13 
Troubleshooting Procedure 
Abnormal noise stops when the spark plug on the
cylinder with defective part is shorted out.   
 
Symptom Possible Cause  Action 
Pisto

Page 1838 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A-14  ENGINE MECHANICAL (6VE1 3.5L) 
Troubleshooting Procedure 
The slapping sound stops when spark plug on bad
cylinder is shorted out.   
 
Symptom Possible Cause  Action 
Timing belt noise  Timing

Page 1839 of 4264

ISUZU TF SERIES 2004  Workshop Manual ENGINE MECHANICAL (6VE1 3.5L)  6A-15 
Abnormal Combustion 
Symptom Possible Cause  Action 
Trouble in fuel system  Fuel pressure control valve defectiveReplace 
 Fuel filter clogged Replace 
 Fuel pum

Page 1840 of 4264

ISUZU TF SERIES 2004  Workshop Manual 6A-16  ENGINE MECHANICAL (6VE1 3.5L) 
Symptom Possible Cause  Action 
Trouble in emission control system  Heated Oxygen Sensor circuit open Correct or replace 
 Heated Oxygen Sensor defective Replace