unstable RPMs, Engine Knocking?

2009 HYUNDAI SANTA FE
140,000 MILES • 2.7L • 6 CYL • 4WD • AUTOMATIC
Avatar
HOSSAMENG84
  • MEMBER
  • 10 POSTS
my car is running perfectly but on idle the RPM starts to play and looks like it is a knocking (sudden unstable firing or something like that which i can feel it inside my car.
Video (Click to enlarge)
Attached Media
Sep 13, 2023 at 5:27 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Thanks for the video, but can you open the hood while the engine is idling and get a video of the engine noise, please? The noise can make the engine idle fluctuate so we need to address this issue which should fix the idling issue. Upload videos of the problem so we can see what's going on.
Sep 13, 2023 at 1:09 PM
Avatar
HOSSAMENG84
  • MEMBER
  • 10 POSTS
Sure..hope that one will be clear enough to hear the engine sound .
Video (Click to enlarge)
Attached Media
Sep 13, 2023 at 9:31 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
I don't hear the knocking, but I do hear ticking which sounds normal, at most it needs a valve adjustment. Also, I would check for a vacuum leak when the engine is cold only and I would service the throttle body.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images (below). Please let us know what happens.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Attached Media
Sep 14, 2023 at 11:20 AM