16 · Diagnostics

S46 Front noise at pick-up

Make: Alfa Romeo
Model: 156 Factory Service Manual
Year: 1997–2002
Section: Noise/vibrations › S46 Front noise at pick-up

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Fault diagnosisS46 Front noise at pick-up

S46 Front noise at pick-up

With the engine running, in the case of brisk acceleration / variations in torque, there is a noise (banging) in the area of the gearbox / transmission

Step	Test procedure	Result	Action
0	PRELIMINARY CHECKS Preliminarily check that the wheels are correctly fixed	OK	Move onto step 1
0		Fixing not correct	Tighten the wheels correctly Op. 4450B10 End of diagnosis
1	SPRING/SHOCK ABSORBER ASSEMBLY CHECK Check the spring/damper unit and ensure the following in particular: the spring/shock absorber assembly fixings are correct there is no contact between the first spring coil and the end of the spring	OK	Move onto step 2
		Fastenings not correct	Restore the fixings for the spring/shock absorber assembly Op. 4110A12 End of diagnosis
		Spring/shock absorber assembly damaged	Replace the spring/shock absorber assembly Op. 4110A12 End of diagnosis
2	FRONT SUSPENSION BUSHES AND FLEXIBLE MOUNTINGS CHECK Check the condition of the bushes and mountings. In the order: flexible supports for front selector forks and track control arms anti-roll bar flexible mountings	OK	Move onto step 3
		Arm supports worn or damaged	Replace the supports (see Assembly 4410B) End of diagnosis
		Selector fork supports worn or damaged	Replace the supports (see Assembly 4410A) End of diagnosis
		Anti-roll bar mountings worn or damaged	Replace the mountings Op. 4410C10 End of diagnosis
3	STEERING TIE-RODS AND ARMS CHECK Check the condition of the steering tie-rods and arms.	OK	Move onto step 4
		Tie-rods damaged or worn	Replace the tie-rids or balljoints Op. 4110B14 End of diagnosis
		Arms damaged or worn	Replace the steering box Op. 4130A10 End of diagnosis
4	CONSTANT VELOCITY JOINTS CHECK Check the transmission constant velocity joints	OK	Move onto step 5
4		Joint damaged	Replace the joint Op. 2710A20 End of diagnosis
5	SUSPENSION FIXINGS CHECK Check that the suspension is correctly fixed to the bodyshell, through the front crossmember	OK	Move onto step 6
5		Fastenings not correct	Restore the crossmember fixings Op. 4110D13 End of diagnosis
6	CHECK CORRECT OPERATION Check that the fault is no longer present	OK	End of diagnosis
6		Fault persists	Incorrect selection of diagnostic procedure

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Parts & tools for this job For 1997 Alfa Romeo 156

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