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Re: Engine noise-'99 3.8
I have had the ceramic insides of a catalytic converter break....causing a rattling sound.
You could have something in the valve train causing a rattle.....
If you need to add coolant from time to time......you could have more serious problems due to coolant in the motor oil.
Of course, like you....the first thing that I thought of when reading the title of this post......was the upper intake manifold internal separation that you mention.
As I have a '96, I am not familiar with the upper intake manifold that you have.
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