**Causes:**  

A) Fuel pipe blockage  

B) Fuel transfer pump failure  

C) Dirty fuel filter  

D) Incorrect adjustment/installation of governor spring  

E) Injector malfunction or incorrect injector model  

F) Restricted fuel tank ventilation  

G) Air in fuel system  

H) Air filter blockage or incorrect model  

I) Sticking of moving parts in engine speed control system  

J) Engine temperature too high  

K) Incorrect valve clearance  

L) Excessive lubricating oil or incorrect lubricant type/specification  

M) Fault in cold start system  

N) Exhaust pipe blockage  

O) Fuel injection pump failure  

P) Low compression pressure  

Q) Sticking valves  

R) Incorrect or wrongly installed high-pressure fuel pipes  

S) Broken valve spring  

**Remedial Measures:**  

A) Inspect/replace fuel pipes  

B) Inspect/repair fuel transfer pump, replace if necessary  

C) Replace fuel filter  

D) Adjust/replace governor spring  

E) Inspect/adjust or replace injectors  

F) Clean/install ventilation pipe  

G) Bleed air from fuel system  

H) Replace air filter/ensure correct model is installed  

I) Inspect and clean  

J) Refer to "Coolant Temperature Higher Than Normal"  

K) Check/adjust valve clearance  

L) Check and adjust oil quantity or change lubricant type/specification  

M) Install cold start auxiliary device. Inspect/repair cold start system, replace if necessary  

N) Check and clear blockage. Verify correct exhaust pipe dimensions  

O) Contact authorized dealer  

P) Refer to "Low Compression Pressure"  

Q) Clean valve stems and guide holes  

R) Correct or replace  

S) Replace valve spring