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Have the hood open and watch the engine movement while someone else shuts it off. Engine moves against motor mounts. Could be one or more of the rubber bushings in the mounts that dampen the noise and vibration are squished a bit more so it rattles at tad at various times. An engine torque dampener would alleviate it if they made such a thing for the Xfire... Generally they make torque dampeners for 4 cylinder engines... SRT-4 and other compacts...
Good luck convincing Chrysler Techs to even acknowledge the noise.
After numerous visits, I actually went down to the dealership during work hours ones day to show them the noise. After turning the car off with the service manager sitting next to me and having the noise occur very loudly, he commented to me that he did not hear anything.
Even with me sitting right next to him and hearing the noise quite loudly, he still claimed he couldn't hear a thing! Needless to say I completely blew up and haven't been back to that dealership since. So far I'm 0 for 2 at service depts. at Chrysler dealerships. There is one more in my area, so I'm crossing my fingers.
Just new here, I have also the noise when the ignition is turned off... did any one have any luck with what was the cause ? Or if there is a fix from Chrysler as my warranty is up in september, can this be fixed by the dealer ?
If it's repeatable, have a friend stand near the noise origination area with the hood up (head in engine bay, ear triad downward), turn off the car, presumably without the clutch pedal down, in neutral. Check for where it emanates from. Look for shrouds that cover the exhaust pipe (heat shields) that may be a bit loose and rattle a bit against some other metal. Have your friend watch the general engine movement and vibration (with clutch in and out to see if there's a difference). Without a load, engine shouldn't vibrate as much. Also see if the engine moves "sideways" or "front-to-back" when shutting off. Will help further determine what part might be rubbing. Also have your friend put his/her head underneath (near front tire) if it seems to be coming from underneath rather than on-top... Good luck... PS - record the sound and take it to Chrysler techs if you have a PDA or some other recording device.