Owners of 2003-06 Murano and 350Z models may come into your store with a complaint of a ticking, clicking, thumping or knocking sound coming from the engine compartment at idle.
One likely source of the noise, Nissan said, is pulsations or oscillations in the fuel feed damper hose.
To make the diagnosis, start the engine and let the engine idle. When the noise occurs, grab the damper hose and feel for a vibration that matches with the frequency of the noise.
If you don't get the vibration, continue troubleshooting. If you do feel the vibration, replace the fuel damper/hose assembly with an upgraded design. Order Part No. 22675-CA00A for Muranos or Part No. 22675-AM60A for the 350Z.
"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].