Loud thumping at idle

[PFlory]

I recently started getting a loud "thumping" noise at idle that comes every 90 seconds or so, that sounds like someone is slapping the passenger side fender with an open palm slap. I've replace the dual mass clutch about 25K miles ago, and didn't know if maybe the vibration damper was failing and causing something or if it could be fuel injector related. The truck is a baby with only 94K miles on the clock. I've been wanting to replace the vib. damper ever since I replaced the clutch but not sure which one to go with, fluid damper/ 6. 7 damper. Really didn't want to put one on that would require removal for the belt replacement.



If anyone has ideas or seen/heard this type thing before your input would be appreciated.



Thanks, Peter

 

[SCClockDr]

If your AC is on (DeFrost?) then I would suspect the AC Compressor as the source of the thump. Otherwise NO Clue.