Some 2005-06 Matrix and Corolla models with 1ZZ-FE engines may produce a droning noise or vibration when accelerated up to 30 mph from a stop.
Toyota says one likely cause for the trouble is a damaged right-side engine mount.
Installing a new-design engine mount, part No. 12305-0D120, should eliminate further issues.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].