Exhaust Leak.I need Help..

[69ChargersRule]

I have an exhaust leak.The exhaust is brand new all the way back from the manifolds.There is a quiet like air leak that gets faster as you go down the road or rev up the motor and slower as the car is just a idol.It also really smells inside the car like almost gas sometimes.Ive checked the gaskets and checked where the exhaust mounts to the manifolds and i cannot find a leak.Is it possible there is a crack in the exhaust manifold?How can i check this stuff out?

P.S this is the stock manifolds no headers....318 motor

[Chryco Psycho]

I never use gaskets between the heads & manifolds  they always blow out , just a thin layer of Ultra Copper silicone , it i spossible the manifold is craked but it should be easy to see

[ralley440]

easiest wasy to find an exhaust leak is take about two cap fulls of trans fluid and dump down the carb while running and it will smoke through the crack.

[Plumcrazy]

While the engine's idling try having somebody hold a large rag or towel over the tailpipe opening.  That should make the leak easier to hear and find.

[Steve P.]

While the engine's idling try having somebody hold a large rag or towel over the tailpipe opening.  That should make the leak easier to hear and find.

       This I agree with. Unless you have a cross over pipe. Then you will need two rags and two friends..


     I am not a big fan of dumping oil or tranny fluid down the throat of a motor.

[Smoke20]

While the engine's idling try having somebody hold a large rag or towel over the tailpipe opening.  That should make the leak easier to hear and find.

       This I agree with. Unless you have a cross over pipe. Then you will need two rags and two friends..


     I am not a big fan of dumping oil or tranny fluid down the throat of a motor.

I agree.  For fun you could use a banana, like in Beverly Hills Cop.