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Weird Sound around 1800 to 2000 RPM only when the engine is already hot

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  • Weird Sound around 1800 to 2000 RPM only when the engine is already hot

    Hello Guys

    I have a 4x2 2018 model Fortuner... Recently I have had this weird noise and very audible if all the windows are rolled up... I cannot describe the sound but it is like plastic knocking / rumble / plastic rattle sounds like... At cold start no issue at all after driving for a couple of minutes the sound starts to appear it only appears during cold weather... And the sound is audible at around 1500RPM or 1800RPM to 2000RPM.. even if you let go of the throttle control once the speedometer hits those RPM ranges going down the sound is audible... And it only appears during city driving not audible in Highway Driving.. Hoping somebody had experienced it and can share some pointers that I can check... By the way, I am from the Philippines and we have a Left Hand Drive.. the sound is audible at the driver's side..

    -Recent Repair was changing the Thermostat since it was stuck open
    -Oil Change 5w-40 Toyota Oil

    Recent check-ups and change parts
    -Change Fuel Filter
    -Cleaned the MAF sensor

    Thanks!
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