23 · Diagnostics

Rear noise (whistling/humming)

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Noise / vibrations › Rear noise (whistling/humming)

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Fault diagnosisRear noise (whistling/humming)

REAR NOISE (WHISTLING/HUMMING)

Whilst driving, especially on unmade roads, there is a whistling noise coming from the rear suspension. This diagnosis can only be made after

See table

Carry out the latter first.

If the problem is only on one side, carry out the checks and any operations on the appropriate side only.

0	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Results of the tests
	Having carried out the road test, see the Table S15 RUMOROSITA'' in condizioni di marcia , there was a whistling noise from the back. Continue depending on the circumstances in which the noise occurs	End of diagnosis	The noise increases when cornering	Replace the wheel bearing on the side where the noise is loudest Op. 4450C32 This bearing is used by the ABS active sensors to calculate the wheel speed. It should NEVER come into contact with metal shavings or magnetic components (screwdrivers, etc.) because they could alter the gap or damage the codifier and prevent a correct reading from the sensor
		End of diagnosis	The noise increases in vertical oscillation conditions	Move on to Step 2
1	BRAKE DISC CHECK	All OK	Problems encountered	Operation
	Check that the gap between the brake disc and the steel shield is sufficient	Move on to Step 2	Gap too small	Restore the correct gap.
2	SHOCK ABSORBER STEM CHECK	All OK	Problems encountered	Operation
	Removing the wheel Op. 4450B12 FRONT WHEELS (TWO) - R+R Check that the noise is not due to irregular friction between the shock absorber stem and the gasket, checking the condition of the stem chrome surface.	End of diagnosis	There is irregular friction	Lubricate the stem raising the dust cover with a layer of silicon grease. If the noise persists, replace the shock absorber Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R

‹ Prev Rear noise (creaking/squeaking/ticking)Next › Rear noise (knocking)

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