12 · Diagnostics

Front noise at pickup

DiagnosisFront noise at pickup · page 1 of 3

Diagnosis table

S46

Symptom / conditions

With the engine running, with sudden acceleration/torque variations, noise (knocks) are heard leading from the gearbox/transmission

Preliminarily check:
– correct wheel fastening

Step	Validity	Operation to be performed	Test results
Step	Validity	Operation to be performed	All OK	Problems found	Intervention
1	CHECK SPRING/SHOCK ABSORBER UNIT	Check spring/shock absorber unit, in particular check the following: – correct spring/shock absorber unit fastening – check there is no contact between the two ends of the spring	Go to Step 2	Incorrect fastenings	Restore spring/shock absorber unit fastenings PROCEDURE OP. 4410A12
			Go to Step 2	Damaged spring/shock absorber unit	Replace spring/shock absorber unit PROCEDURE OP. 4410A12

2	CHECK FRONT SUSPENSION BUSHES AND PADS	Check intactness of bushes and pads, in the following sequence: – wishbone pads	Go to Step 3		Worn or damaged wishbone pads	Replace pads PROCEDURE OP. 4410B40, and PROCEDURE OP. 4410B68
			Go to Step 3	Stabiliser bar pads worn or damaged	Replace pads PROCEDURE OP. 4410C10
		[1108] – stabiliser bar pads
3	CHECK STEERING UNIT AND STEERING LINKAGES	Check intactness of steering unit and steering linkages.	Go to Step 4	Damaged or worn linkage	Replace linkages PROCEDURE OP. 4110B14
		Check intactness of steering unit and steering linkages.	Go to Step 4	Faulty steering unit	Replace steering unit PROCEDURE OP. 4120A10

4	CHECK CV JOINTS	Check transmission CV joints	Go to Step 5		Damaged joint	Replace joint PROCEDURE OP. 2710A54 (wheel side) or PROCEDURE OP. 2710A52 (differential side)

(Cont..)

Parts & tools for this job For 1998 Fiat Seicento

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