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Discussion Starter #1
With the engine cover removed, a Loud Rattle is heard under light acceleration, the EGR is apparently working, needle moves, idles rough with the EGR solenoid disconnected etc., but rattle can't be heard at all with the engine cover installed, sounds fine then, what else is how probable with this engine, intake leaks, cracked head, or is it normal?
 

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Any exhaust manifold or EGR tube exhaust leak?
Are you hearing pre-ignition or spark knock or ping? Is the ignition timing set correctly? If it is too far advanced or the fuel mixture is too lean, it will tend to ping on acceleration when warm.
 

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Any sign of excessive oil consumption? Later years had a problem with intake belly pans leaking.

Gerry G.
And that would make them prone to spark knock.
 
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