I have an 02 disco 2 and it doesn't overheat or smoke, but it is LOUD! It sounds like a train and it sounds like the problem is coming from the left side(drivers side) and after driving a while, at a stop, it smokes a little from that area but out the side from under hood...it has 158800 miles and noise is worse when I push on the gas. I cansmell exhaust fumes pretty strong, too.....ideas?

 

Loose or broken exhaust manifold? Any codes? D*

 

Check the exhaust manifold as said above, but most of the time that is a blown head gasket that is pushing out externally. A leak down test is the way to know for sure unless you can feel the air push out from the head/block seam.

 

Unless engine kept clean may just be leaked oil accumulation heating up and smoking off from leaky manifold. May the RGs be with you.
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Check the exhaust manifolds for loose nuts or broken studs,blown head gasket wont produce excessive exhaust fumes.