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Before I start, I have read this thread and it doesn't help Toyota Highlander 2015 rattle sound at (cold) start.

For the past few months, my car started making a rattling/knocking sound (Don't exactly know what to call this sound) when the engine starts. But, it doesn't happen always and there is no specific pattern. It doesn't appear to be a starter motor problem either. Since it is random, the mechanics can't reproduce it.

I am attaching video links to three recordings where you can hear the sound easily.

https://youtube.com/shorts/5-acCN6g3YE?feature=share

https://youtube.com/shorts/VxSB91qMKig?feature=share

https://youtube.com/shorts/nSKsJCLHJVo?feature=share

Please help me understand what could be the problem.

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  • Perhaps I'm having trouble on my end but none of these 3 videos seem to have an actual recording of the car starting.
    – jwh20
    Oct 5, 2022 at 12:25
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    @jwh20. must be a problem with your device. I can hear the engine start and also the rattling sound.
    – HandyHowie
    Oct 5, 2022 at 16:56
  • @jwh20 Please use headphones. Hard to notice on speakers.
    – Ali
    Oct 6, 2022 at 1:14

1 Answer 1

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One possibility is a fault with the starter motor.

The front bearing of the starter may be worn, allowing the shaft and/or pinion to rattle once it disengages from the ring gear on the flywheel.

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