finding where the leak is in the exhaust

[xavier]

I have replaced the exhaust manifold seals and the seal between the manifold and the downpipe. I can still here a bit of a blow. Is there anyway to pinpoint where the leak is? I have got a feeling the new gasket between the manifold and the downpipe is faulty.

[steve_k]

Put a damp cloth overr the end of the exhaust (held in place with a bit of string/rubber band) & with the engine running have a look underneath & you should be able to see where it's blowing.

[daimlerman]

The cast manifold does seem to warp with age,this is what causes the studs to break,so it may be an to have it's mating surface ground flat.

[xavier]

I have a spare manifold off of a later e30. It has the four stud downpipe connection and none of the emmision reducing pipes. Can these be used as a replacement?

[Brianmoooore]

The manifold will fit the engine (check that it's flat first), but check that it'll bolt to your downpipes.

[xavier]

Thanks folks