18 · Diagnostics

S05 Engine hissing

Fault diagnosisS05 Engine hissing

There is buzzing (low frequency noise) coming from the engine, whose intensity varies with the number of revs

Step	Test procedure	Result	Action
1	CHECKING AIR INTAKE CIRCUIT Check air intake system condition and seal	OK	Move onto step 2
1		Circuit component damaged	Replace the component involved End of diagnosis
2	CHECKING ENGINE EXHAUST Check the engine exhaust system and, in particular: manifold pipe exhaust silencer catalytic converter front/rear gaskets	OK	Move onto step 3
		Pipe damaged	Replace the pipe End of diagnosis
		Intermediate silencer damaged	Replace the intermediate silencer Op. 1076B26 End of diagnosis
		Rear silencer damaged	Replace the rear silencer Op. 1076B22 End of diagnosis
		Front gasket worn or damaged	Replace the front gasket Op. 1076B34 End of diagnosis
		Rear gasket worn or damaged	Replace the rear gasket End of diagnosis
3	CHECKING CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
3		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.