08 C2, PPI performed 700 miles ago and just rolled over 50k miles yesterday. Took it out for a drive and ran it to about 15 miles left of gas and planned to refuel in a day or so. Got home and pulled in the garage and noticed a tick/knock from the rear. Considering I just got the car I am hoping I’m just paranoid but would love input from anyone with more knowledge and experience. Here’s a video of it running at temp. Oil level is full and drives normal. Thoughts?

 

Can’t get the video to upload!!! Ugh

 

Low on fuel? Your fuel pump gets extra noisy when low on fuel since it's in your tank. Could also be that.

 

Was hoping that was the issue but refueled last night and it’s still making noticeable today though not as prominent.

 

Upload the video to YouTube and then post the link here. Videos exceed the direct upload size limit.

 

Thanks for the advice! Here it is.

 

Scope your cylinders - from the top and bottom.

 

Please also temporarily remove your serpentine belt (completely; don't want an accident) and re-shoot the video.

 

Possibly a water pump going south? If you listen from underneath the car on the driver's side, does it get louder?

The reason (I'm assuming) @jchapura suggests removing the serpentine belt is to help determine if it is an ancillary component that could be the culprit, or the engine itself.

 

Yes, it gets noticeable louder when looking under the driver side rear.

 

That's a good idea.

The noise I don't like is the clunk, clunk you can hear a couple of times.

 

Dropping it at the local shop tomorrow morning. Wish me luck!

 

Good luck. Please keep us posted.

 

Will do!

if it’s the WP, any others items that make sense to do at the same time?

 

Low temp thermostat. Serpentine belt. Pulley kit. Coolant flush.