18 · Diagnostics

S13 Engine howling

Fault diagnosisS13 Engine howling

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

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Carry out a road test to check the conditions which give rise to the noise	OK	Move onto step 3
		The noise also occurs with the engine switched off (when warm)	Move onto step 1
		The noise occurs when braking	Move onto step 2
		The noise occurs when steering	Move onto step 3
1	MULTI-PURPOSE VALVE CHECK Check the condition of the multi-purpose valve, located on the fuel supply pipe	OK	Move onto step 2
1		Multi purpose valve faulty	Replace the valve 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 3
2		Brake servo valve faulty	Replace the valve Op. 3330D26 End of diagnosis
3	CHECK ON POWER STEERING PUMP With the engine running, operate the steering to full lock in both directions	OK	Move onto step 4
3		Pump noisy	Replace the power steering pump End of diagnosis
4	CHECK ON CORRECT OPERATION Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
4		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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