Geely EC718 2009 Workshop Manual page 127

Engine
Symptoms
Lack of Fuel Supply, Misfire
Fault Definition: After the
engine speed increases, there
is continuous pulsation, or
jitter, usually even more
noticeable with the engine load
increases. When the engine
speed is above 1,500 rpm, the
fault does not appear.
Suspected Fault Items
13. Cylinder Compression Pressure
Incorrect
14. Valve Stagnant or Leakage
15. Camshaft Convex Corner Wear
16. Valve Timing Incorrect
17. Valve Spring Broken
18. Excessive Carbon Residue in
Combustion Chamber
19. Camshaft, Cylinder Head, Piston,
Connecting Rod and Bearing Abnormal
20. Exhaust Not Smooth: Three-way
Catalytic Converter Plug, Muffler Internal
Damage
21. Electromagnetic Interference (EMI)
in the voltage circuit may lead to engine
Misfire. Use the scan tool to monitor the
engine speed to detect electromagnetic
interference. Engine speed parameters
sudden increase while the actual engine
speed is almost no change indicates the
presence of electromagnetic
interference. If there is a fault, check
whether there is a high voltage part in the
vicinity of the ignition control circuit.
Control System JL4G18-D
Relevant Sections
"Engine Exhaust System" in
Information and Procedures.
EC718/EC718RV EC715/EC715RV 10/2009
2-45
the2.7.5 Diagnostic
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