2001 Ford F150

2001 FORD F-150
170,000 MILES • 6 CYL • 2WD • AUTOMATIC
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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 6:19 PM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 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 7:24 AM
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