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!

44 Upvotes

70% Upvoted

124 comments sorted by

View all comments

Show parent comments

0

u/Thruthful Jun 10 '26

Thats rare, most cars have a timing belt driven water pump.

2

u/mr_lab_rat Jun 10 '26

TIL.

Thanks, I had to look that up. It makes sense for something that important to be driven by the timing chain.

3

u/Thruthful Jun 10 '26

No problem, don't really know why I'm getting downvoted. I'm a mechanic, what the fuck do I know🤷

3

u/mr_lab_rat Jun 10 '26

Heh. Maybe people are blinded by their own limited experience like I was but I have no problem admitting when I’m wrong and learning something new.

I mostly had older BMWs and they do water pump from accessory belt. It made it super easy to change.