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When I hit the throttle going uphill, sometimes my 2019 Ford Ranger XLT diesel develops a tinny rattle in the engine bay.
This could be caused by something inside the engine bay rattling or vibrating, but could also be linked to the exhaust system or its heat-shielding doing the same thing. When you hit the accelerator up a hill, the engine and driveline (and exhaust) are suddenly put under a lot of stress which can be passed along any mechanical link or fixture, making things flex or vibrate that don’t normally do so when they aren’t subjected to the same stresses and loads.
When the engine is cold, have a feel around the engine bay to find anything loose or poorly mounted that could contribute to such vibrations. It could be as simple as a poorly located clamp of a loose piece of trunking or internal panelling vibrating against another part. Often these noises will be conveyed into the cabin via the fresh air vents, making them sound even louder.
Just be sure not to confuse a rattle with the normal cacophony of noises a modern turbo-diesel produces as part of operating under load.
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