| Condition | Possible Cause | Correction |
| Improper fuel injection timing | Engine control system problem | Diagnose engine control system.
Refer to “Diagnostic Information and Procedures”in Section 6E,Engine Control System |
| Error detected by engine control system | Abnormalities to each sensor,etc | Replacement |
| ECM error | Replacement | |
| Engine control system problem | Diagnose engine control system
Refer to “Diagnostic Information and Procedures”in Section 6E,Engine Control System |
|
| Improper compression pressure | Excessive or insufficient valve clearance | Adjustment |
| Sticking of valve stem(valve open condition) | Disassemble and repair | |
| Defective valve spring | Replacement | |
| Valve seat wear | Disassemble and repair | |
| Compression leak caused by defective piston ring | Disassemble and repar | |
| Defective gasket | Disassemble and repair | |
| Piston seizure | Disassemble and repair | |
| Improper fuel | Moisture in fuel | Replacement |
| High oil consumption amount | Piston ring wear or breakage | Disassemble and repair |
| Defective valve stem oil seal | Disassemble and repair |
Isuzu engine symptoms: White exhaust gas and solutions