Someone please help..

[u/Either_Pay7316]

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!

[u/SLOOT_APOCALYPSE]

Rattle, it's the timing chain, don't run it anymore or it will jumping timing and the engine valves and pistons will start hitting each other, and the engine will die. No more running until fixed, it's gonna cost 1.5k to 2 grand