Excessive engine vibration or knocking noises heard while the engine is idling, being started or switched off are usually caused by a defective engine mount at the top right side of the engine. A redesigned engine mount is available to alleviate this problem.Google+
Car Problem Reports
Mazda Mazda3 Defective Engine Mount May Cause Excessive Vibration/Noise
Mazda Mazda3 Problem
Engines Affected: 2.0L 4 Cylinder, 2.5L 4 Cylinder
Average Mileage: 74,460 mi (7,000 mi - 112,800 mi)
Visitor, 2010 Mazda Mazda3, 2.5L 4 Cylinder, 7,000 mi
same issue, engine mount defective #1 mount needed to be replaced. new models have modified mounts thsat absorb the vibration better, this vehicle is a skyactiv and the engine got a lot of trottling poiwer and shakes like crazy when idle
Visitor, 2010 Mazda Mazda3, 2.0L 4 Cylinder, 80,000 mi
Bringing it in on Monday.
Visitor, 2004 Mazda Mazda3
There is a large clunking noise when I start up and drive my car.
Visitor, 2005 Mazda Mazda3, 67,500 mi
I am currently having this problem.It is getting progressively worse. Problem occurs on passenger side when idling with foot placed on brake.