22 · Diagnostics

Engine hissing

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Noisy'' / vibrations › Engine hissing

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Fault diagnosisEngine hissing

ENGINE HISSING

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

1	INTAKE AIR CIRCUIT CHECK	All OK	Problems met	Operation
		Results of the tests
	Check the condition and seal of the air supply circuit	Continue to Step 2	Circuit component damaged	Replace the component
2	CHECKING ENGINE EXHAUST	All OK	Problems met	Operation
1.9 JTD 16V	Check the engine exhaust system and, in particular: Manifold Pipe Exhaust silencer	Continue to Step 3	Pipe damaged	Replace the pipe Op. 1076B12
			Intermediate silencer damaged	Replace the intermediate silencer Op. Op. 1076B26 INTERMEDIATE EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
			Rear silencer damaged	Replace the rear silencer Op. Op. 1076B22 REAR EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
2.0 JTS	Check the engine exhaust system and, in particular: Manifold Pipe Exhaust silencer Catalytic converter front gasket	Continue to Step 3	Pipe damaged	Replace the pipe Op. 1076B12
			Front silencer damaged	Replace the front silencer Op. Op. 1076B30 FRONT EXHAUST SILENCER - R + R
			Intermediate silencer damaged	Replace the intermediate silencer Op. Op. 1076B26 INTERMEDIATE EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
			Rear silencer damaged	Replace the rear silencer Op. Op. 1076B22 REAR EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
			Front gasket worn or damaged	Replace the front gasket Op. Op. 1076B34 FRONT CATALYTIC CONVERTER ATTACHMENT SEAL - REPLACE
3.2 V6	Check the engine exhaust system and, in particular: Manifold Pipe Exhaust silencer Catalytic converter front gasket	Continue to Step 3	Pipe damaged	Replace the pipe Op. 1076B12
			Intermediate silencer damaged	Replace the intermediate silencer Op. Op. 1076B26 INTERMEDIATE EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
			Rear silencer damaged	Replace the rear silencer Op. Op. 1076B22 REAR EXHAUST SILENCER - R+R EMISSION CONTROL VERSIONS
			Front gasket worn or damaged	Replace the front gasket Op. Op. 1076B34 FRONT CATALYTIC CONVERTER ATTACHMENT SEAL - REPLACE
3	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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Parts & tools for this job For 2003 Alfa Romeo GT

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