Autodata Technical Issue 30 – Knocking noise from rear of 2009 Mazda 5
Each month the Autodata team answers a common technical question and provides a printable document with technical diagrams to download and keep, exclusively for IGA members. This month, the cause of a rear knocking noise in a Mazda 5 is resolved.
Q. We are having problems finding the source of a knocking noise from the rear of a 2009 Mazda 5 which occurs when driving over rough roads. We have checked the rear suspension components but cannot find any excess wear. Do you have any ideas what could be causing this noise?
A. We are aware of a problem on this model which causes a knocking noise. It is due to the rear suspension spring upper rubber insulation cup coming adrift as a result of a protruding welding bead. Check if the rear suspension spring upper rubber insulation cup is displaced (Fig 1.1).
If the rubber insulation cup is displaced, remove rear suspension spring and rubber insulation cup. Reduce the height of the welding bead at the rear suspension spring upper mating surface. Fit a modified rubber insulation cup to rear suspension spring. Refit the rear suspension spring. Road test the vehicle to confirm the fault has been rectified.
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