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Weird sound while in reverse

830 views 5 replies 3 participants last post by  Fanger 
#1 ·
I get a "knock" sound when I go in reverse sometimes. It only happens after I go a couple feet in reverse. What is it?
 
#2 ·
Don't everyone answer all at the same time now
 
#3 ·
I have a rattle that comes from under the car, sometimes, when i put the car into D or R. ...

I have a rattle that comes from under the car, sometimes, when i put the car into D or R. It usually but not always happens when the engine is cold. I went to the dealer yesterday, the car would not make the noise and the dealer put the car up on the hoist but could not find in faults.

I will let you know if i find the source.
 
#4 ·
I had a catalytic converter that failed - it sounded like marbles rattling around in a can.

There have been several posts about catalytic converter failures.
Mine made the rattling sound mainly when it was cold. It appears to be fairly common, the service writer knew what it was as soon as he hear it.
 
#5 ·
I'm gonna bring my car in to the dealer and see what they say
 
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