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Alfa Romeo 156 Factory Service Manual (1997-2002)16 · Fault diagnosis

16 · Diagnostics

S13 Engine howling

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Noise/vibrations › S13 Engine howling

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Fault diagnosisS13 Engine howling

S13 Engine howling

There is a constant, low frequency noise, only noticeable for short periods of time

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Carry out a preliminary test to check the conditions which give rise to the noise	OK	The noise does not reoccur:Move onto step 3
		The noise increases considerably with the steering in the end of travel position	Move onto step (see S35)
		The noise also occurs with the engine switched off (when warm)	Move onto step 1
		The noise increases during braking	Move onto step 2
1	MULTI-PURPOSE VALVE CHECK Check the condition of the multi-purpose valve, located on the fuel filler pipe	OK	Move onto step 3
1		Valve faulty	Replace the valve pump Op. 1040A30 End of diagnosis
2	BRAKE SERVO VACUUM VALVE CHECK Check the condition of the one-way valve on the brake servo vacuum pipe	OK	Move onto step 36
2		Brake servo valve faulty	Replace the valve Op. 3330D20 End of diagnosis
3	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
3		Fault persists	Incorrect selection of diagnostic procedure

‹ Prev S12 Cyclic engine droning Next › S20 Gearbox/differential unit noise general

Parts & tools for this job For 1997 Alfa Romeo 156

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