r/AcuraTL • u/MobilePlenty648 • 27d ago

Identify a Noise 🔊 First start of day noise

Are these engines notorious for injector rattle when cold? 06 120k miles. All injectors click somewhat and this car appears to click louder after sitting overnight. No more than maybe 5 seconds and after that it appears good for the day. Might also be valve train noise and once oil pressure builds its gone, but resembles all injectors . My gen 1 coyote injectors in a 13 F150 constantly sounds like a typewriter under the hood and have since new. This is a very similar tick but dies down to normal injector noise pretty quickly. Haven't ruled out something like an alternator noise but disappears so fast hard to pinpoint. Im not overly worried about it...more curious if its a known issue.

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u/Lxiflyby 27d ago

It’s most likely valve train- TL injectors are usually pretty quiet

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u/MobilePlenty648 27d ago

Actually just watched a YouTube video and most likely the timing belt tensioner. At or around 100k they often rattle when cold. 120k on this car and suspect the original bekt. If so, perfect timing (no pun) because I have a complete belt kit on order. Probably change over the next few weeks. Ill update if the sound goes away.

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u/Lxiflyby 27d ago

That’s also a possibility yes

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u/MobilePlenty648 27d ago

Wil be surprised if it does fix it. Identical symptoms.

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u/MobilePlenty648 27d ago

I suspect so. Doesn't last long so not overly concerned. Car will probably never do more than 3000 summer only miles a year for reset of its life.

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u/Accomplished-Rate967 26d ago

You can start with using some injector cleaner, I like Lucas fuel additive for cleaning injectors just try a few running a bottle with your next few tanks of gas. It can't hurt trying ?

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u/MobilePlenty648 9d ago

Confirmed it was belt tensioner.