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It knocks when started.

Tiny
FCRACING24
  • MEMBER
  • 2001 FORD F-150
  • 200,000 MILES
Will the knock caused by back pressure on a cat converter clog stop after replacement of converter or is it now permanent? Truck wont drive. I was told that is was caused by back pressure from a bad cat converter. I plan to have this fixed but I didn't want to spend the 1,000 to fix this if the motor is bad now. Will the knock stop once the exhaust is fixed?
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Sunday, January 8th, 2012 AT 5:31 PM

2 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Remove the o2 sensor and this will stop the back pressure. Test drive it. This will give u your answer.
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Sunday, January 8th, 2012 AT 5:41 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
U will still have to replace the conveter any way try this and see if the engine performace comes back.
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Sunday, January 8th, 2012 AT 5:47 PM

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