The van is making a single, dull, heavy, ‘thud’ or ‘clunk’ like sound. There does not seem to be any pattern or repeating causitive condition associated with the noise. The sound may occur when the engine is idling or when it is in gear (sometimes when shifting gear, sometimes when accelerating or decelerating, but more commonly when at a constant speed). Sound usually does not occur when braking or cornering.
When the ‘thud’ sounds when the van is in motion there does not appear to be any change in speed/acceleration. Engine (5.2L) is smooth/strong with 93K.
What is this noise and is it a serious issue? Any suggestions for troubleshooting this problem would be much appreciated.
Thank you for your expertise in this matter.