2001 Ford F150

2001 FORD F-150
170,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
JAMES HAUGHTON
  • MEMBER
  • 1 POST
Why does my truck mis under a load? And it makes a knocking noise at the muffler.
Sep 8, 2009 at 11:19 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
If you hear a knocking noise, chances are the inside of the catylatic converter or the muffler is lose inside. That whould cause a knocking sound and it could cause a miss.

Take a rubber mallot and tap on the muffler and converter. See if there is a noise there.

Let me know what you find.
Sep 10, 2009 at 12:24 AM
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 Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.