it would be best because you could tear the old ones while removing them.
Good idea to do so
Your Camry might have a loud exhaust in the winter weather because of damaged or weakened exhaust gaskets or manifold gaskets. The cold weather causes these gaskets to shrink which makes the vehicle sound louder.
manifold or downpipe gaskets may be leaking gases or worse, cracked manifold
No
The year, engine size and if it is the intake manifold or an exhaust manifold gaskets would help.
it sounds like your exhaust manifold gaskets are leaking or you half a hole in your Y pipe
theres no way you can change the head gaskets without taking off the intake manifold, its not hard to do. plus if your going to change the head gaskets it would only be smart to change the intake gaskets also.Answerand if your talking about the exhaust manifold, you did'NT specify, I'm sure you can but it will be no fun at all, plus u should change exhaust gaskets if your going to do all that work anyways so you don't have to worry about them down the road.
manifold gaskets only need to be replace if they leak, or if the manifold has been removed for some reason
Theoretically, under normal operating conditions, and proper maintenence, intake manifold gaskets should last for the entire life of the vehicle. To my knowledge, there is no prescribed routine replacement interval for intake manifold gaskets. Of course anytime a head(s) is removed, then new gaskets should be used in reassembly.
The oil leak is coming from the valve cover gasket and leaking onto the exhaust manifold, the rubber valve cover gaskets get hard from the engine heat and start to leak, you will have to replace the rubber valve cover gaskets to stop the oil leak
What engine???????? You should refer to repair manual if not familiar with auto repair and understand the terminology before attempting Remove nuts holding exhaust manifold to cylinder head & remove nuts/bolts holding exhaust manifold to exhaust pipes Use new exhaust manifold gaskets and install the new manifold securing the manifold to cylinder head (may need to but new nuts and or bolts) by "snugly" tightening manifold to cylinder head if not refering to repair manual
This is a major repair requiring the removal of the intake and exhaust manifold, and then the removal of the heads. Not a DIY repair unless you have the knowledge, and tools necessary to accomplish this repair. If you want to tackle this job, I suggest you buy yourself a repair manual for your Pontiac.