Please help identify the noise
Thread Starter
Cruising
Joined: Mar 2026
Posts: 13
Likes: 4
Please help identify the noise
Hi guys,
I’m getting a random clicking/knocking noise from the bottom of the engine area on a 2015 C7 Z51 (8L90).
I also opened the front bell housing access cover as mentioned here, but I couldn't 't tell that the noise was coming directly from the hole. It seemed more like center of the oil pan.
Attaching a video below.
Could this be flexplate, coupler, or something else?
Any input appreciated.
Thanks!
I’m getting a random clicking/knocking noise from the bottom of the engine area on a 2015 C7 Z51 (8L90).
- Noise is not perfectly rhythmic, follows engine speed but doesn’t happen every revolution
- Starts about 1–2 minutes after cold start
- Most noticeable at idle / low RPM, mostly disappears above ~2500–3000 RPM
- Much louder from underneath, barely audible from the top
- Oil pressure is normal
- Oil filter is clean (no significant metal)
- Recently had torque tube service (bearings/couplers)
I also opened the front bell housing access cover as mentioned here, but I couldn't 't tell that the noise was coming directly from the hole. It seemed more like center of the oil pan.
Attaching a video below.
Could this be flexplate, coupler, or something else?
Any input appreciated.
Thanks!
Race Director
Joined: Aug 2015
Posts: 12,240
Likes: 4,738
From: SE WI
Thread Starter
Cruising
Joined: Mar 2026
Posts: 13
Likes: 4
Might be a good point!
I’ll try removing the serpentine belt and listening to it today.
I was also told to check the torque of the flexplate-to-crankshaft bolts.
I’ll see if I can reach them through the bellhousing service hole.
I’ll try removing the serpentine belt and listening to it today.
I was also told to check the torque of the flexplate-to-crankshaft bolts.
I’ll see if I can reach them through the bellhousing service hole.
Thread Starter
Cruising
Joined: Mar 2026
Posts: 13
Likes: 4
I removed the serpentine belt tensioner, but the knocking from the oil pan area is still there.
I also checked the torque of the flexplate bolts, and they seem properly tightened.
I tried to look for signs of loose rivets on the flexplate, but through the access hole I didn’t see anything suspicious.
It’s also hard to pinpoint the source of the noise, as it seems to resonate throughout the entire oil pan.
I also checked the torque of the flexplate bolts, and they seem properly tightened.
I tried to look for signs of loose rivets on the flexplate, but through the access hole I didn’t see anything suspicious.
It’s also hard to pinpoint the source of the noise, as it seems to resonate throughout the entire oil pan.
Racer
Joined: Sep 2011
Posts: 455
Likes: 55
I removed the serpentine belt tensioner, but the knocking from the oil pan area is still there.
I also checked the torque of the flexplate bolts, and they seem properly tightened.
I tried to look for signs of loose rivets on the flexplate, but through the access hole I didn’t see anything suspicious.
It’s also hard to pinpoint the source of the noise, as it seems to resonate throughout the entire oil pan.
I also checked the torque of the flexplate bolts, and they seem properly tightened.
I tried to look for signs of loose rivets on the flexplate, but through the access hole I didn’t see anything suspicious.
It’s also hard to pinpoint the source of the noise, as it seems to resonate throughout the entire oil pan.
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Thread Starter
Cruising
Joined: Mar 2026
Posts: 13
Likes: 4
