Squeaky is as squeaky does
Some 2010-2012 Mazda3 vehicles (including 2.0L SKYACTIV with A/T only) may exhibit a squeaky noise from the engine compartment when the vehicle starts moving and/or during transmission shifting.
This is caused by a stick-slip noise occurring at the contact surfaces between the No. 4 engine mount rubber and the No. 4 engine mount bracket when the engine shakes back and forth.
To correct the problem, the No. 4 engine mount is replaced and grease is applied on the contact surfaces of the No. 4 engine mount bracket.
Remove the No. 4 engine mount rubber (refer to MS3 online instructions or workshop manual section 09-20 ENGINE REMOVAL/INSTALLATION).
Clean the surfaces of the No. 4 engine mount bracket where it contacts the engine mount rubber. Place masking tape over the bolt hole of the No. 4 engine mount bracket to prevent grease from entering the hole (grease in the hole can result in a hydraulic lock, preventing proper bolt tightening torque).
Apply rubber grease on the surfaces of the No. 4 engine mount bracket on 4 lateral sides where it contacts the engine mount rubber. Wipe off any grease on the top surface and remove the masking tape.
Install a new No. 4 engine mount rubber. Install other parts in reverse order of removal. Verify the repair.
P/N ITEM NOTE
BBM4-39-070B No. 4 mount rubber for 2.5 w/ 6MT and 2.0 w/5MT
BBM5-39-070B No. 4 mount rubber for 2.0, 2.5 and 2.0 SKYACTIV w/AT