I just got back from the Smog joint and the fella down there suggested I wouldn't pass the visual because of the amount of smoke that comes from my tail pipe. Now what I noticed is that it puffs smoke after sitting at idle for a few min then slowly dissipates away. since the smoke disappeared he went ahead and smogged it anyway, then I failed on the Hydrocarbon reading, he said likely from unburned fuel, he said also if I am getting a lot of oil into the combustion chamber (perhaps from bad valve seals) it could have toasted by Catalytic converter over time.

SO at this point I assume that means I could use new valve stem seals and a new CAT, which to me would likely make sense as my van only has 58k on the clock, which means it sat for a good amount of time at some point in its life and they very well could be dried up and cracked. and my exhaust sucks so I am going to replace the whole thing.

Now for my questions:

1.First a foremost, is there anything else that is common in these vans that cause similar pipe smoking?

2.Does anyone know what part numbers I should reference for the seals from Toyota? (my van is a 1987 Manual 4x4 cargo)

3. Should I go ahead and replace anything else while I am in there?

4. has anyone ever heard of being able to replace valve stem seals without pulling the head? (I just found some references to that on the web, but never heard of it before)

5. Any other insights would be awesome and appreciated as always

thanks!!!