2018 Signature engine squeak/chirp when cold started - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 13 (permalink) Old 06-19-2019, 02:02 PM Thread Starter
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2018 Signature engine squeak/chirp when cold started

Hi there,

My car is making the oddest sound when first starting in the morning.
After about a minute after engine is started, it makes this brief high pitched chirp/squeak noise. Sounds like a belt engaging but I don't think that's what it is. Car does the noise regardless if AC system is on or off. I was thinking it was the AC compressor kicking in but it does it with the AC off, so I don't think that's it.

Was reading on a Mazda3 forum about a high pressure fuel valve but there were no videos of the sound for me to see if it was comparable.

Here's a video I captured of it this morning. It does this noise every time it's started after sitting for an extended amount of time (2-3 hours). Car does it whether I sit and idle or if I start driving immediately...


Anyone else have this same noise in their rig?
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post #2 of 13 (permalink) Old 06-19-2019, 07:05 PM
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I don't think I have the same sound as yours. Those Mazda guys said that it could be the auto tensioner, I mentioned this on the other thread.

I remember our CR-V 98, and the problem was the A/C clutch bearing. It doesn't matter if it's engaged or not since it is always turning and so I was hearing the intermittent sound back then.
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post #3 of 13 (permalink) Old 06-19-2019, 08:31 PM Thread Starter
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What I find strange is it does the noise once only and at the same time affer starting. About a minute or so. That makes me think something is timed.

What engine system would activate about a minute after starting?

The car has been parked for over 3 hours tonight and the engine was still quite warm and it didn’t do the noise when I tried just a few minutes ago.
I will get an engine video tomorrow morning and see if I can pinpoint where it’s coming from.
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post #4 of 13 (permalink) Old 06-20-2019, 12:34 AM
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What I've observed, it happens when I start it for the first time of the day. It's intermittent, it can happen after I go out the garage.

I can't confirm where the sound is coming from.
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post #5 of 13 (permalink) Old 06-20-2019, 03:58 AM
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Thinking out loud... can't hear it, the speakers on this laptop are not great, that and my hearing isn't as good as it once was...


Thermostat
Belt
Auto tension - as mentioned
water pump
Turbo wastegate

Do you have the climate control set to Auto?
AC compressor clutch
Blend door

Guessing you'd probably have to leave it at the dealer overnight and then (you) start it for them the next morning to replicate for them.


.

2018 Signature - White Pearl - Chestnut
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post #6 of 13 (permalink) Old 06-20-2019, 06:57 PM Thread Starter
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It did it again this morning. About 45 seconds after cold start. No AC, No Climate system on...all systems off.


I've got an engine video which I will post in the next few day (just away on work).
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post #7 of 13 (permalink) Old 06-21-2019, 04:47 PM Thread Starter
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Another video. This one is taken right after start up, noise happens at 41 second mark. You can hear the cold start rapid warm up system turn off and the idle settle. Car idles at the cold elevated idle for a period of time and then the "squeak" noise.

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post #8 of 13 (permalink) Old 06-21-2019, 04:52 PM Thread Starter
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Found a video of a MazdaSpeed3 noise...very similar

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post #9 of 13 (permalink) Old 06-21-2019, 05:32 PM
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I think you captured it very well. Mine doesn't do it, but then I'm still under 7,000 Km.


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post #10 of 13 (permalink) Old 06-24-2019, 07:02 PM
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Quote:
Originally Posted by GTEyes View Post
Another video. This one is taken right after start up, noise happens at 41 second mark. You can hear the cold start rapid warm up system turn off and the idle settle. Car idles at the cold elevated idle for a period of time and then the "squeak" noise.

https://youtu.be/tpZnN59pSYo
Is your car still under warranty? You can present this video to them. I don't like the sound, sound's like hitting a metal.
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