It knocks when started.

2001 FORD F-150
200,000 MILES
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FCRACING24
  • MEMBER
  • 1 POST
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?
Jan 8, 2012 at 9:31 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
remove the o2 sensor and this will stop the back pressure.test drive it.this will give u your answer.
Jan 8, 2012 at 9:41 AM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
u will still have to replace the conveter any way try this and see if the engine performace comes back.
Jan 8, 2012 at 9:47 AM
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