I have the same problem in my 2000 grand am! Have had it in the shop three times and they can not find the problem either. Exhaust system is tight, replced manifold gasket, still fumes. seems to be worse when cold is cold, after stopping from a drive, can smell on drivers side under the hood??? Help!
between the exhaust manifold and the muffler, closer to the engine though
From the outside it looks like a muffler. It's on the exhaust pipe, in front of the REAL muffler and behind the manifold.
Check exhaust hangeers and clamps Check the heat shield on the catalytic converter Cold be a broken baffle inside the muffler
check your engine for a cracked manifold (covering of the engine parts and cylinders. also look for any exhaust leaks. it sounds like the exhaust noise isn't making it to the muffler as it should and instead is coming from the engine directly.
if you are talking exhaust manifold it usually sounds like a loud or worn out muffler. it will also usually have some black soot around the leaking area.
It's welded in like a muffler. Any muffler shop can do it for you.
Usually on all vehicles the oxygen sensors are on the exhaust manifold and catalytic converter. On Caravans this is definitely true. The upstream O2 sensor is on the exhaust manifold which is in the front, and the downstream O2 sensor is on the Catalytic Converter which attaches to the exhaust manifold, looks like a small oddly shaped muffler in the middle of the underside of the engine compartment leading to the exhaust system.
Check your muffler, I have a 96 grand am and it does the same thing it is because my muffler was hanging loosely so i tightened it with some wire, and now it will rev randomly after driving it a minute or two, because the muffler is too tight.
In the exhaust pipe.
Follow the exhaust off the back of the motor and on the exhaust pipe it is the first sensor you come too.
sounds like the cadileadic converter or muffler is pluged
they have 2 o2 sensors on the muffler ELIA