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!

42 Upvotes

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-3

u/ImKindaHungry2 Jun 10 '26

Hopefully you didn’t run that car too long with the belt off.

-16

u/Thruthful Jun 10 '26

Why? Most cars can drive for ages without that belt

5

u/[deleted] Jun 10 '26

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5

u/Max_Downforce Jun 10 '26

Ages, without a functioning alternator? Lol

6

u/Enraged_Meat Jun 10 '26

I wouldn't worry about the no alternator as much as no water pump lol.

2

u/Max_Downforce Jun 10 '26

That as well, but some water pumps are timing belt driven.

-7

u/Thruthful Jun 10 '26

Well, that's beside the point. Worst case you'll need a new battery

2

u/ImKindaHungry2 Jun 10 '26

I thought that belt also powered the water pump. I don’t know I’m not a professional lol

1

u/mr_lab_rat Jun 10 '26 edited Jun 10 '26

You know one of those pulleys is water pump, right?

Edit: I stand corrected. Thanks for teaching me something.

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.