22 · Diagnostics

Engine''buzzing

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

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Fault diagnosisEngine''buzzing

ENGINE''BUZZING

There is a constant, loud noise coming from the area of the engine, which is only heard within a certain engine speed range.

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Check the condition and seal of the air intake circuit	Continue to Step 1	Circuit component damaged	Replace the component
1	ENGINE SUPPORTS CONDITION CHECK	All OK	Problems met	Operation
	Check the correct fixing and condition of: Engine supports Flexible mountings Reaction rod	Continue to Step 2	Engine supports fixing not correct	Restore the correct fixing
			Gearbox side engine support defective	Replace the gearbox side engine support Op. Op. 1008A42 GEAR BOX LEFT RIGID MOUNT - R R
			Timing side engine support defective	Replace the timing side engine support Op. Op. 1008A46 CAM SHAFT LEFT RIGID MOUNT - R R
			Rear engine support defective	Replace the rear engine support Op. Op. 1008A44 REAR RIGID MOUNT - R R
			Front support flexible mounting faulty	Replace the front support flexible mounting Op. Op. 1008B10 POWER UNIT FRONT MOUNT (TIMING SIDE) FLEXIBLE BLOCK - REPLACE
			Rear support flexible mounting faulty	Replace the rear support flexible mounting Op. Op. 1008B20 POWER UNIT INTERMEDIATE MOUNT FLEXIBLE BLOCK - REPLACE
			Gearbox side support flexible mounting faulty	Replace gearbox side support flexible mounting Op. Op. 1008B30 GEARBOX SIDE MOUNT FLEXIBLE BLOCK - REPLACE
			Reaction rod fixing not correct	Restore the correct fixing
2	ENGINE EXHAUST SUPPORTS CHECK	All OK	Problems met	Operation
	Check that the exhaust pipe mountings are fixed correctly	Continue to Step 3	Mountings loose	Secure the mountings
	Check that the exhaust pipe mountings are fixed correctly	Continue to Step 3	Mounting damaged	Replace the mounting
3	ENGINE EXHAUST CHECK	All OK	Problems met	Operation
1.9 JTD 16V	Check the engine exhaust system and, in particular: Manifold Pipe Exhaust silencer	Continue to Step 4	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 seal	Continue to Step 4	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 seal	Continue to Step 4	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
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

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