Engine knocking sound?

2005 PONTIAC GRAND PRIX
3.8L • AUTOMATIC • SUPERCHARGED
Avatar
JR47
  • MEMBER
  • 116 POSTS
Getting a knocking sound, its not any of the pulleys took the belts off one at a time and ran it for a few seconds to be sure, sounds internal from the middle to right side of the engine. The car is high milage
Video (Click to enlarge)
Attached Media
Sep 27, 2026 at 8:14 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,540 POSTS
Yep, I would see if you can hear which side the engine is making the noise and then remove the valve cover on that side. It sounds like a rocker arm is bad or you have a flat camshaft, see if you can find the loose rocker, you might need to "bump" the engine over.
Sep 28, 2026 at 5:13 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle