Just replaced the valve cover gasket on my own Toyota corolla with 94,000 miles on it. I noticed that the timing chain had some slack to it, as in I could pull it up and down. Seemed too loose compared to other resources I've looked into, but I'm wondering if that is cause for my short term fuel trim to bounce between 4% to 6% when idling...what are the cons/dangers of a loose timing chain? Whats the process to get it tightend, and is it something a novice could handle fixing? Thank you for your time.

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Would slack in the timing chain be cause to increase short term fuel trim?

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30/09/2022 7:43 pm

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Just replaced the valve cover gasket on my own Toyota corolla with 94,000 miles on it. I noticed that the timing chain had some slack to it, as in I could pull it up and down. Seemed too loose compared to other resources I've looked into, but I'm wondering if that is cause for my short term fuel trim to bounce between 4% to 6% when idling...what are the cons/dangers of a loose timing chain? Whats the process to get it tightend, and is it something a novice could handle fixing?

Thank you for your time.

Devin Ashland

(@devin-ashland)

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1 Answer

01/10/2022 6:26 am

Well realize the tensioners hydraulic and you can't really check the tension unless the engine's running because when it's not running hydraulic tension we're going to be somewhat loose. All cars will run a little bit off on there fuel trim but he might run so good fuel cleaner and see if that makes any difference. First. If a timing chain is really loose, it will clack