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1990 Toyota corolla how do you know if timing chain is bad?

There are a few signs that may indicate a bad timing chain in your 1990 Toyota Corolla:

1. Rattling or clunking noise from the engine: A bad timing chain can produce a rattling or clunking noise, especially when the engine is cold and first started.

2. Engine misfires or hesitation: A stretched or damaged timing chain can affect the valve timing, leading to misfires or hesitation during acceleration.

3. Reduced engine power: A faulty timing chain can disrupt the proper synchronization of the engine's components, resulting in reduced power and performance.

4. Rough or uneven idle: A bad timing chain may cause the engine to run rough or have an uneven idle due to incorrect valve timing.

5. Check Engine Light: In some cases, a bad timing chain can trigger the Check Engine Light to illuminate on the dashboard.

It's important to note that these symptoms can sometimes be caused by other issues as well. If you suspect a problem with the timing chain, it is recommended to have the vehicle inspected by a qualified mechanic who can accurately diagnose and address the issue.