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Depends on your definition of rattle. Engines don't rattle unless something is loose or a rock has landed in a cooling hole on the side of the catalytic converter. So , if you can give us a better description of what the engine is doing, you'll get a load of incorrect answers.
Sorry for the late reply but, no, it is not related to a loose heat shield. It is a louder rattling sound more like a loose bearing vibrating inside either the transmission or the clutch assembly. Only between 1600 and 1900 rpm. and it is not present under ou over these rpm. The rattle desappear when I lock the 4X4. Dealer is out of solution!!
Sounds like the viscosity of your oil is not high enough for the mileage. My van has a loud valve rattle when it is low on oil or is in need of an oil change. I use I higher viscosity oil and a bottle of lucas oil stablelizer and it quites right up. This may not be the case for you. You need to isolate the noise. By isolating the noise it will give you a better idea of whats making the noise. Try using a mechanics stethoscope and find where the noise is coming from. It might just be time for your mechanic to overhaul your engine.