terrifying cold start 2.5NA - Page 2 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #11 of 12 (permalink) Old 12-21-2018, 10:23 AM
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Mazda designed these engines to build oil pressure almost-instantly on start. The fast idle is an EPA thing to pass emissions (to get the cat hot enough to light off quickly) and the sound is not so much from that as it is from intentional valve overlap that the ECU runs to get "extra" heat into the cat and get it hot fast.
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post #12 of 12 (permalink) Old 12-21-2018, 11:20 AM
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Quote:
Originally Posted by tickerguy View Post
Mazda designed these engines to build oil pressure almost-instantly on start. The fast idle is an EPA thing to pass emissions (to get the cat hot enough to light off quickly) and the sound is not so much from that as it is from intentional valve overlap that the ECU runs to get "extra" heat into the cat and get it hot fast.
Ticker beat me to it. Your car is fine, though it may not sound it. We get someone in here just about every year asking the same question.

Here's the more thorough description of it: https://forum.mazda6club.com/3rd-gen...ml#post4029634

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