I have a new cx 5 diesel automatic, 6 months old, which has a strange sound coming from the engine. It sounds high pitched almost pinging, dynamo sounding which I can't figure out. Sounds a little like a loose fan belt or the valves? And does not make the noise when first started and cold but once the engine has warmed up. Also it is really noticeable when driving slowly in the city and when taking the foot off the accelerator and doing round 1500 to 1800 revs. Left the car at the dealer for a week and the mechanic/s couldn't figure it out either. Tried another one that was there for service and that also had the sound but not as loud. Does anyone have any idea or experienced anything like it. I think the car is amazing, smooth handling and great acceleration but this sound makes me want to get rid of it.
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