Rattling noise when pressing the accelerator pedal?

2018 MITSUBISHI MONTERO
113,478 MILES • 2WD • AUTOMATIC
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RAE00
  • MEMBER
  • 1 POST
My car has been making a rattling noise for over a year now and it’s getting worse, every time I push down on the gas it starts making this weird rattling noise and also when I’m idling the car.
May 27, 2023 at 9:14 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

Is the sound coming from under the hood or under the vehicle? If so, the most common cause is a loose heat shield on the exhaust system.

Do me a favor. Take something like a rubber mallet and tap on the exhaust to see if you can recreate the sound. If you can, have a helper tap on it while you locate where it is coming from.

Heat shields are welded in place. The welds break and then they rattle. These shields are normally around the catalytic converters and mufflers. If you can, record it and upload it for me to hear. I should be able to tell you if that is the issue.

Take care,

Joe
May 28, 2023 at 9:01 PM
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