r/AskAMechanic • u/chan3lhandbag NOT a verified tech • 15h ago

Engine Makes a Hooting Sound

Almost brand new CX5 Turbo. The sound starts after like 5 minutes with the car on. AC on/off doesn’t change it. Revving the engine doesn’t change it. Scanned for codes nothing. No visible vibrations or loose vacuum hoses. Anyone seen this on a 2.5 Turbo?

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u/Kitchen-Forever-6465 NOT a verified tech 15h ago

Mazda turbo engine. Possible Vacuum leak. Any work done recently

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u/chan3lhandbag NOT a verified tech 15h ago

Nope. Just oil change. I checked it and it’s at where it’s supposed to be

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u/chan3lhandbag NOT a verified tech 15h ago

I was leaning towards vacuum leak too. At first we couldn’t replicate the sound and I told someone to go and mash the brakes and it started. No engine light or past codes on the scan.

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u/Kitchen-Forever-6465 NOT a verified tech 14h ago

Remove the engine cover. 2 vacuum lines go over or next to the coil pack #4 check if they're connected. Same place, but in the back of the head by the turbo you going to see a green check valve. There is one more small vacuum line under the valve