Geely EC718 2009 Workshop Manual page 521

Engine
Flange Irregular Joints
Exhaust Manifold Cracked or Broken
Exhaust system components welded joints leakage
2.7.5.5 Exhaust System Noise
When the engine is running, exhaust has noise or unusual sound. Check whether there is "Exhaust System Noise" fault, as shown
in the following table:
Crack sound or hiss
Exhaust sound too big
External Noise or Vibration Noise
Internal Noise
2.7.5.6 Exhaust System Repair Notes
Warning!
Refer to "Exhaust System Service Warning" in "Warnings and Notices".
Warning!
The broken three-way catalytic converter must be replaced. It is not allowed to remove three-way catalytic converter
exhaust system, otherwise there will be serious air pollution.
Note
In the following conditions, three-way catalytic converter may be damaged or malfunction:
–
Work outside the closed-loop mixture control system.
– Engine burns a large amount of engine oil.
– If the three-way catalytic converter exhaust temperature is too high, at more than 840°C (1544 ºF).
Note
– Vehicles with three-way catalytic converter can not use leaded petrol. Lead will pollute the three-way catalytic
converter.
– Do not drop the three-way catalytic converter, as this may damage the ceramic carrier.
– Do not allow water, engine oil or fuel enter into the converter, because this may contaminate the ceramic substrate.
If necessary, repair or replace the associated components.
Replace the exhaust manifold. Refer to
Replacement.
Replace the leaking parts.
Exhaust system leaking. Refer to
1. Compare with a vehicle known in good conditions.
2. Check the muffler for damage or malfunction. Replace the faulty muffler.
3. Refer to 2.7.6.3 Front Muffler Replacement
Replacement.
1. Check whether the hook is bent or loose or whether shrouds fasteners are
loose.
2. Check whether the exhaust pipe is interfered.
1. With a rubber hammer knock these parts to confirm the noise.
2. Replace the faulty three-way catalytic converter or muffler. Refer to
2.7.6.2 Three-way Catalytic Converter Replacement
Replacement or 2.7.6.4 Rear Muffler
Exhaust System JL4G18-D
2.7.6.1 Exhaust Manifold
2.7.5.4 Exhaust System
or 2.7.6.4 Rear Muffler
or
Replacement.
EC718/EC718RV EC715/EC715RV 10/2009
2-439
Leakage.
2.7.6.3 Front Muffler