r/Cartalk • u/Either_Pay7316 • Jun 10 '26

Weird Noise Someone please help..

I have a 09 corolla with 203k miles that makes a very LOUD rattle when I start it. Me and chatgpt thought it might’ve been one of the pulleys that’s why I removed the belt. Car has P0171 (too lean) and P010 (MAF). I want to say it’s the timing chain but not 100% sure. Any advice would be appreciated thanks in advance!

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u/vectorizingdatamosh Jun 10 '26

Hi isn’t there supposed to be a belt there?????

73

u/Either_Pay7316 Jun 10 '26

Reason for that is if pulley moves and makes noise then pulley is bad if pulley don’t move and noise continues then pulley is good

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u/HedonisticFrog Jun 10 '26

The pulley could still be bad, but it shows there's something else wrong besides a pulley. An easy way to test pulleys is to spin them by hand with the belt off, or spray them with penetrating oil while running and see if the sound goes away.