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  #1  
Old 11-06-2010, 03:38 PM
patocka8787 patocka8787 is offline
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Default unknown noise!

Hey guys i got a 4.0 6cyl auto that i just recently had alot of work done too. we just put new injectors and new cats on it and for some reason now when i drive it and stop it will make this mysterious knocking noise about every few seconds. It hasnt seemed to do any damage to the motor and its been running smoothly but its just something im concered about. it sound up near the fire wall on the passenger side. If anyone knows of this problem also please tell me whats happening and if its anything to worry about. thanks guys.
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  #2  
Old 11-06-2010, 04:26 PM
tiredtruckfixerupper tiredtruckfixerupper is offline
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Default Re: unknown noise!

could be an exhaust leak. does it stop or slow when she gets hot
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  #3  
Old 11-07-2010, 06:24 PM
crowdpleazer crowdpleazer is offline
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Default Re: unknown noise!

just to be clear, do you mean after the engine is shut off? when your stopped at a red light? or when the truck is in park?
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  #4  
Old 11-09-2010, 05:59 PM
bluerang3r bluerang3r is offline
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Default Re: unknown noise!

yeah more info is really needed... if i had to take a guess the cats will make a noise when you get new ones.. its because they are expanding cause they have never been that hot before... it happened when i got my new exhaust system but after you break them in it will go away.. if its not that then i have no idea what it is
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  #5  
Old 11-09-2010, 06:32 PM
2002 2WD Edge 2002 2WD Edge is offline
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Default Re: unknown noise!

Quote:
Originally Posted by patocka8787 View Post
Hey guys i got a 4.0 6cyl auto that i just recently had alot of work done too. we just put new injectors and new cats on it and for some reason now when i drive it and stop it will make this mysterious knocking noise about every few seconds. It hasnt seemed to do any damage to the motor and its been running smoothly but its just something im concered about. it sound up near the fire wall on the passenger side. If anyone knows of this problem also please tell me whats happening and if its anything to worry about. thanks guys.
You said 'we'..you did it yourselves or did a licensed garage do it? If an lg did it then they should help figure it out. The idea of breaking in cats is possible too since they are meant to heat up to extremely high temperatures in their core,..new ones not being subjected to that.
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