What is this? Knocking Popping Tapping noise from the engine bay no codes
 

I just started getting a loud tapping/popping noise in the engine bay. I have no ECU codes.
Could this be just the pulley gone bad? I know the pulley tensioner slaps around quite a bit.

I have a JRSC with stock internals/pulleys etc..

https://youtu.be/l7NS0vcuIdM
https://youtu.be/YQYV7Oli4i8

Spinning the idler pulley by hand. It seems to stop abruptly compared to the other pulleys I spin
https://youtu.be/AHYiAQcQG9g


Another video of the noise
https://youtu.be/Ps47cWnoCpA

Doesn't sound like a pulley to me. Listen with a rubber hose and isolate where the noise is coming from

Sounds like its in the vicinity of the passenger side around Cylinder #1 or #3, but sounds louder when I'm closer to #3.
Was listening to rod knock videos, and I think it sounds similar.

Oh, my, .......I'm not sure what is making that tapping/knocking sound ...... but, it can't be good .......:sigh:


humfrz

Sounds like valve noise. Time to tear into it.

I'm going to bring it to the stealership for a diagnostic. Unfortunately I don't have the time to take it apart.

Hoping that it isn't rod knock and is easier/less expensive to fix. Bracing for the worst though.

I didn't want to be the first one to say this... not from a video on the internet. But his response to my post is not awesome. :(

Right? We've heard enough of them by now.

"Trust your instincts, Luke."

Sounds like valve or rocker arms.

Ya, it does sound a little light for a rod knocking.

Back in the day I would have called that sound a tappet out adjustment or a stuck hydraulic lifter …….. but, we aren’t back in the day ……:iono:


humfrz

Humfrz,

Give a listen to this one and let me know what you think. It's from a cold start the next day. It is pretty loud when I move to the passenger side.

https://youtu.be/6zrsWeDxsIE

Manual or auto?

Manual Limited

Does not make a difference if I have the clutch pedal pressed down or up.

If it was an auto the answer would have been simple but it doesn't apply to the manual.
http://www.ft86club.com/forums/showthread.php?t=107577
I am in the crowd that thinks it sound a little light for rod knock but unfortunately don't have any other answer.