Why does my truck mis under a load? And it makes a knocking noise at the muffler.
Sep 8, 2009 at 11:19 AM
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JACOBANDNICKOLAS
✓Experienced Mechanic
110,248 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.