Knoc,Knoc sound
February 26th, 2008, 1:36 PM
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Knoc,Knoc sound
I had a 05 Coly 2wd 3.5 5spd that was wrecked and now have a 07 4wd 3.7 and both make a Knoc,Knoc sound from under the cab part of the truck about a min. after I turn it off.It doesn't sound like anything is wrong I'm just curious about what it is,anyone know?
February 26th, 2008, 9:29 PM
#2
CF Monarch
RE: Knoc,Knoc sound
Its normal. Catalytic converter. Its just cooling down. Sounds like someones thumping on a tin bucket. 
All cars do it to an extent, but the newer catalytic converters are made better, so they have a lot more tapping noise than older cars.
All cars do it to an extent, but the newer catalytic converters are made better, so they have a lot more tapping noise than older cars.
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