Any Ideas on this knocking noise?

Efiesta89 · Saturday at 4:06 PM

Recently picked up this 2019 with 47,000. Had all 3 motor mounts done and replaced with OEM. Had transmission fluid drained and filled with 2L Ravenol MTF-2. Knocking noise persist. Usually begins after car has warmed up. Can hear knocking noise when slowing down. Knocking starts between 10-15 mph. Can hear knocking when giving it little revs. Also, I’m pretty sure I can hear it while just driving but hard to tell over engine noise and other noises.
Thanks!

http://imgur.com/a/1AyEs1v

View: https://imgur.com/a/1AyEs1v

Toddcam09 · Saturday at 4:13 PM

tpms broken off inside one of your tires maybe?

Efiesta89 · Saturday at 4:22 PM

Toddcam09 said:

Don’t think so. Only happens when the car is warmed up. No TPMS lights on the dash either. It sounds like a harder repair unfortunately!

Ricky_Bobby_24 · Sunday at 6:16 PM

I just had a similar sound on my driver side and it ended up being my U joints in my front axle. But I was at 170K miles too... Replaced them just back in January.

Ricky_Bobby_24 · Sunday at 6:22 PM

Efiesta89 said:

Also, With you saying it only happens when warmed up, It could be an Exhaust hanger that is worn and with the heat could be allowing it to hit on something?

Efiesta89 · Sunday at 7:08 PM

Ricky_Bobby_24 said:

Thanks for your input! For the record I am not a mechanic at all. I actually just changed my first battery in my life today on the fiST. Did the purge valve as well and lucky for me it started back up! I did kind of shake the exhaust around before because I’ve read that’s a known issue but the car wasn’t warmed up at that point. Maybe I’ll get it warmed up and give it a shake again. It’s hard to pin point where the sounds coming from. Can’t tell if it’s coming from the gear box where i hear the regular clanking of the transmission or some where else. Sounds like it could be in the front right possibly. No idea. My next step I guess will be learning how to jack the car up and getting under it and shaking things around.

Intuit · 2026-04-14T21:12:34-0500

Saw/heard this earlier and really don't know what this is. Had a failed passenger side engine mount on mine and it made a clack sound on clutch release. The clue was excessive engine movement with the hood up, idling.

Efiesta89 · 2026-04-15T07:23:19-0500

Intuit said:

Thanks! The thing that sucks is I just had these mounts replaced. I did however replace them with OEM, so maybe going after market would have been better. Crazy the mounts are brand new and still causing issues. That’s why I was concerned it might be something else. The knocking on de-acceleration doesn’t seem to change whether or not I have the clutch in or out. Doesn’t seem to change whether I’m in neutral or gear. Can hear it knock real quick if I give it a little blip in 2nd. I just don’t see myself swapping out the mounts again less then a month later. Especially since I can’t do the work myself.

SteveS · 2026-04-15T08:18:18-0500

Did it make the noise before you replaced the engine mounts? If not, then they probably were installed incorrectly or are loose. Or something was left loose incidentally during the process.

Efiesta89 · 2026-04-15T08:30:48-0500

SteveS said:

It did make the same noise before the new mounts but I kind of think it maybe worse. It’s hard to be sure because we’re getting warmer weather now and the issue seems to arise after the car is warmed a good bit. Now it’s always warm because of the weather. I was kind of thinking I should have waited to see what it was like once spring and summer came. Is there a way to check this out might self? My guess is it’s the RMM. Sounds like it might be coming from that location.

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Any Ideas on this knocking noise?

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