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Cant you just ask the people at the car place?
The knocking noise in or around the catalytic converter comes because something is broken. It could be a pipe or a strap or something else. Fix it before you leave your exhaust pipe on the road.
I have found that the noise that you are hearing are due to a belt adjustment that your car needs to have done - that is if you have a 2006-2008. Mine is making that noise but the dealer that I got it from are having a hard time reading the tsb on it so that they can properly fix the noise.
It is your blend door actuator. Good luck! It is a cheap part but an expensive time consuming fix.
I have a 1997 Chevy Malibu with 176k on it. Never had a new engine or anything, runs like a champ. It has been making a knocking noise when its cold.(until car is warm) for a long time now. It still makes a little one while at idle, not loud or can even really be heard though.
You will have to determine the source of the noise before you can fix it.
how do you fix timing on wipers 2000 buick regal
An engine knock ia almost always very serious. Stop drivng this car and take it to a professional. Not a repair for a novice.
Take it to the dealer crushed metal gasket or something Replaced w rubber and a boot and rocks up in the awd driveshaft. Cost me $300
Got to be the CV joint going bad. A reputable garage, a reputable mechanic, quality parts..........say $300 to fix it.
A 2000 Commodore where the oil checks out okay at the dipstick but is dry when the oil cap of the inner housing is removed may have a faulty oil pump. This makes a clunking noise as if some cylinders have blown but may be a much simpler fix.