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What is causing the squealing noise when I accelerate in my 2014 Mitsubishi Mirage?

Asked by Tracie

My daughter and I both have 2014 Mitsubishi Mirages and they are both making the same noise. The belt has been changed on both cars as this was what Mitsubishi told me the problem was. But this only fixed the problem for a short time. It’s a squealing noise on acceleration. Any ideas, as they can’t tell me at this point?

Answered by CarsGuide

11 Sep 2020 David Morley

The drive belts on the engines might be new, but what about the pulleys they run in? A pulley with a worn bearing can start to squeal when under load, such as when you start to accelerate and the belt has to speed up. Also, any coolant or oil on the belt can make it screech, too. When the belts had just been replaced, they were nice and clean, but after a few kilometres have passed and contaminants have been able to build up, you might be back to square one again with a screaming rubber belt.

Check the belts for coolant or oil (or anything else) on them as well as the pulleys and tensioners to make sure a small leak in the engine is not being spread all over the place by the belt. Check the belts for correct tension, too, as this can vary over time and is a classic cause of noisy operation. It does seem odd that both cars have started to make the noise in unison, but stranger things have happened.

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