My 2004 T&C Minivan sounds like a diesel engine when it idols? It sounds like the diesel engine I owned 20 years ago. (
Have you checked the exhaust manifold for leaks?
When did you last change the spark plugs, air filter, and fuel filter?
Does it sound like an American Idol?
Have you checked the oil? When was the oil last changed? A complete lack of oil will cause this kind of noise. It is basically the engine’s death cry. I sincerely hope this is not the case. The 3.0 Mitsu motor they put in those vans would make all kinds of noise when they got over 60,000 miles, but they stopped using that engine in either 2000 or 2001.
Could You Please Tell Us Which Engine You Have In Your T&C ? It Makes A Difference When Talking About Specific Engine Issues. Good Job Providing Make, Model, Model-Year, And Miles, By The Way.