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Discussion Starter · #1 ·
Driving home today i noticed a noise in the last 10 minutes or so of the drive - sounded like a slowish and like 'tik-uh tik-uh' sounding ticking noise and it got a bit louder when i accelerated away from a stoplight gently - once up to normal speed it seemed to quiet back down but it was still there, harder to hear over road noise / wind.

When i got home i popped the hood and was a bit worried with how it sounded.

Recorded a short vid from under the hood and in the car near the vent where i was able to hear it most


note - i recently had an oil change done at a new shop - they said they put in amsoil 0w20 full synthetic, replaced the oil filter and cabin filter (hadnt yet, about 27k on the car, was grody)

any ideas? This is a 2015 s touring 2.5l auto
 

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Discussion Starter · #2 ·
let the car cool off and checked the oil level because i was curious

level seems to be quite high

dipstick has 2 holes in it for min/max and my oil was about 1/3 inch past the max level.
 

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at what engine and vehicle speed is this sound loudest? Does it go away under acceleration on the highway? is it louder in higher gears? is it louder if you rev it in neutral at idle? does not sound like engine knock or detonation to me. could be many things, need more info...
 

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Discussion Starter · #4 ·
update - i made a mistake checking the oil - car wasnt level - was on a bit of a decline with the front end lower.

Re measured and its dead on full - oil place didnt screw up.

As for the noise- it was still there just the same after i started it up again for my brother who came over to check it out. It was independent of engine speed - revving it up a bit and it stayed the same.

It seemed dependent on load - when i backed the car up to level ground, and again to park it again it got a little louder but didnt seem to get faster.

My bro thought it wasnt engine knock, his guess was a tensioner or something like that.

going to try to get it to dealer tomorrow morning hopefully.
 

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That doesn't sound good. I would make 100% sure they used an OEM oil filter and not some cheap crap. What is really throwing me off is you say the noise does not change with RPM..
 

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Discussion Starter · #6 ·
Oil change place uses this http://www.opticatonline.com/part/service-champ-of4622-engine-oil-filter#engine-base:2564

Mazda tech at dealer said he couldn't really hear it and that it was fine. He couldn't explain why it was a completely new noise.

I told him I recently had a oil change done 2 weeks ago and his guess was the filter might be generic.

He said the oem filter has some spring mechanism in it that maybe is missing.

I have no idea, sound only started up yesterday. Oil place offered to put on a oem filter for free if I provide, or a free replacement champ filter if I want.

I.got a service ticket that says couldn't reproduce at least. Will try a oem filter next and see what happens.
 

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Take this one step at a time. I'd try getting the oem filter put in. Other cars are known to be picky on filters with similar symptoms.

The shop that did your oil change sounds pretty good. They're actively trying to help you out there. Not many will do that.
 

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Discussion Starter · #8 ·
Yeah my opinion of the lube place went up after that call. My first time using anyone after my dealer went out of business.

After looking up how to change oil on our Mazda it looks super easy, I may swap the filter myself when I get some time next week.

Probably won't have an update till thur- Fri.
 

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Discussion Starter · #9 ·
quick update - video that better catches the noise without the rest of the engine noise- center airvents is where the mics at - all at below 35-40 mph.

 

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Discussion Starter · #11 ·
What is really throwing me off is you say the noise does not change with RPM..
Does it change at all with higher rpms? In the second video it sounds like it does some but its not the same as the engine rpm.
I should revise my statement. It does change with rpm but only when in gear. Revving it parked doesn't make a difference.
 

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Discussion Starter · #12 ·
Update on this, got oem filters, funny enough the parts department at local dealer gave me the cheap generic oem model they use instead of the official one.

Dunno what that was about, I asked for the correct part number and he had those too for like a dollar more.

No idea what the difference is. I took the slightly more expensive model.

New thing to add:. My a/c doesn't work anymore, I think it hasn't for a week + now, I didn't think anything of it when I first noticed it wasn't blowing cold but today with 60+ degree weather it blows hotter with ac on than off.

Scheduled another apt with dealer Monday.

Might swap the oil filter Tonight not sure.
 

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Discussion Starter · #14 · (Edited)
Dealer said the a/c compressor needs to be replaced and placed an order for it 2 weeks ago. Just today i called them to ask whats taking so long, they said 5-10 day wait. Apparently part is back ordered with no estimate on when it will be available. Sooo... awesome, i asked the service manager what i can do as an alternative and he said the only thing he can do is bug mazda to send it asap.

Didnt swap the oil filter for a OEM part, i honestly dont feel like thats it but i will give it a shot if the noise doesnt go away after the warranty work.

Kinda annoying not having a/c- its already reaching 80s here in SE Wisconsin and driving with windows down is only going to work for so long :/ Maybe i could find a oem parts vendor and get it through them as an alternative.

edit - i will update as this gets resolved, im really hoping the compressor is the cause of the noise too - i dont plan to let it go, im not buying them not hearing it, will take it elsewhere if they claim its not able to be 'recreated'...
 

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Discussion Starter · #15 ·
Update - Part finally came in and they were able to replace the AC compressor today.

Afterwards the car blew nice cold air and the knock noise in these videos appears to have gone as well. Not sure what defect in the compressor caused the noise.

I will keep an ear out to see if the noise comes back, hopefully this fixed it!
 
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