23 · Diagnostics

Excessive rolling/pitching - at front

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Steering – vehicle behaviour › Excessive rolling/pitching - at front

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Fault diagnosisExcessive rolling/pitching - at front

EXCESSIVE ROLLING/PITCHING - AT FRONT

The customer complains of an excessive rolling and/or pitching sensation of the vehicle, especially at the front.

1	ROAD TEST TO EVALUATE THE ROLLING - PITCHING	All OK	Problems encountered	Operation
	Carry out a road test to evalute the folling/pitching of the vehicle See Test 44B ROAD TEST FOR ROLLING/PITCHING EVALUATION	End of diagnosis	Subjective judgement compared with the reference vehicle 6	Acceptable behaviour of the vehicle
			Subjective judgement compared with the reference vehicle 5.5	Move on to Step 2
			Subjective judgement compared with the reference vehicle 3-4	Move on to Step 3
2	END OF TRAVEL BUFFER CHECK	All OK	Problems encountered	Operation
	Visually inspect that the end of travel buffer is not faulty and is correctly inserted in its housing	Move on to Step 3	End of travel buffer deteriorated	Replace the end of travel buffer Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R
		Move on to Step 3	End of travel buffer not correctly inserted in its housing	Restore the correct fitting of the end of travel buffer
3	UPPER TRACK CONTROL ARMS CHECK	All OK	Problems encountered	Operation
	Check the condition of the bushes securing the upper track control arm to the bodyshell Also check the condition of the track control arm pin boot	Move on to Step 4	Bushes secured to the bodyshell not intact	Replace the upper track control arm Op. 4410B68 LOWER SWINGING ARM(ONE), LH OR RH OF FRONT SUSPENSION - R R -CHECK WHEEL ALIGNMENT SEPARATELY
		Move on to Step 4	Arm pin boot not intact	Replace the upper track control arm Op. 4410B68 LOWER SWINGING ARM(ONE), LH OR RH OF FRONT SUSPENSION - R R -CHECK WHEEL ALIGNMENT SEPARATELY
4	LOWER TRACK CONTROL ARMS CHECK	All OK	Problems encountered	Operation
	Check condition: - the front bush securing the lower track control arm to the engine frame; - the rear hydraulic bush securing the lower track control arm to the engine frame; - the pin securing the lower track control arm to the steering knuckle.	Move on to Step 5	Front bush not intact	Replace the lower track control arm Op. 4410B52 FRONT SUSPENSION LOWER TRACK CONTROL ARM REAR BUSH LEFT OR RIGHT - REPLACE AT BENCH
			Rear hydraulic bush not intact	Replace the rear hydraulic bush complete with support Op. 4410B52 FRONT SUSPENSION LOWER TRACK CONTROL ARM REAR BUSH LEFT OR RIGHT - REPLACE AT BENCH
			Lower track control arm attachment pin not intact	Replace the lower track control arm Op. 4410B52 FRONT SUSPENSION LOWER TRACK CONTROL ARM REAR BUSH LEFT OR RIGHT - REPLACE AT BENCH
5	SHOCK ABSORBER EFFICIENCY CHECK	All OK	Problems encountered	Operation
	Check the efficiency of the shock absorbers by carrying out manual compression manoeuvres (resting on the bonnet by the centre of the wheel), which should be carried out on both sides of the vehicle	Move on to Step 6	Sudden return without damping	Replace the shock absorber that is not working properly Op. 4410A12 FRONT SUSPENSION DAMPER (ONE), LH OR RH - FOR MCPHERSON STRUT SYSTEM - INCLUDES DISMANTLING/REASSEMBLY OF ASSEMBLY AT BENCH - R.R
6	VEHICLE GEOMETRY CHECK	All OK	Problems encountered	Operation
	After replacing the shock absorbers, check the geometry	End of diagnosis	Geometry values do not conform	Restore the geometry to the correct values Op. 4450A10 FRONT WHEEL GEOMETRY - CHECK USING OPTICAL EQUIPMENT - INCLUDES ADJUSTMENT IF NECESSARY

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Parts & tools for this job For 2005 Alfa Romeo 159

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