198001930 - S005 ENGINE HISSING

There is a low frequency noise coming from the engine whose intensity varies with the number of revs.

		TEST RESULTS
1	AIR INTAKE CIRCUIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition and seal of the air intake system	Move on to Step 2	Circuit component damaged.	Replace the damaged component.
2	ENGINE EXHAUST CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the engine exhaust system, in particular:- Manifold- Pipe- Exhaust silencer- Catalytic converter front seal.	End of diagnosis	1. Pipe damaged.2. Rear silencer damaged3. Front gasket worn or damaged.	1. Replace the pipe2. Replace the rear silencer    Op. 1076B20 REAR EXHAUST SILENCER - R + R 3. Replace the front gasket