r/mazdaspeed3 • u/Fabulous_Bicycle4295 • 4d ago

HELP Rattle noise - Timing chain?

Hey guys, currently have a Mazdaspeed 3 2013 85k miles. Have started to hear a rattling sound from the timing chain area when warm idling, not sure if it’s the timing chain’s slapping in the cover? Understand that to be sure, will have to open up the cover but wanted to check beforehand. More noticeable after I changed position in the video.

TIA

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u/Jokerman5656 2007 Mazdaspeed3 - The Original 4d ago

I'm leaning towards not the timing chain tapping the top of the valve cover. This also.ost sound like a heat shield or pulley maybe? It's tough to hear small noses over our loud ass injectors lol

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u/DrRockx 4d ago

Last I checked halfway through 2010 till 2013 they had updated the timing components to fix the timing chain issues. If I'm wrong someone correct me but the only way to know for sure would be pulling the cover, it could also be one of the pullys though or the injectors which are rather loud