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Hey all, This is my first post here, so I figured I'd do a bit of an introduction as well. I'm located in western BC and I've got myself a '90 base Comanche 4.0, 5-speed, rwd for $800CAD, looking to do a lot of cool stuff with it, but need to get the main issues sorted first. I've fixed my tail light wiring, and done the headlight relay mod, which fixed my flickering headlights. I've noticed in the right lighting I can see smoke/fumes entering the cab from what seems to be low on the passenger side (below the dash) and possibly the ripped shift boot. After a bit of reading I went ahead and replaced the exhaust manifold, and added a flex joint in a new downpipe, with new gaskets all around. I noticed a stud had been snapped in the head, so I went ahead and drilled and tapped the hole larger. Also, the cat has been removed at some point. After this, nothing has changed. I'm still seeing and smelling fumes leaking into the cab. I noticed that I have a filter on top of the valve cover that leaks oil out onto the cover. Could this possibly be a source of the smoke? Everyone I've taken along to check it out has said the smoke smells more like oil than exhaust. The weird thing is, it only smokes under load. If I'm sitting in neutral at a light, I can rev it all day and not have any fumes come in, same with going downhill in gear. Going up hill is another story, it's at it's worst when on the gas in 3rd - 5th gears, especially going up hill. I'm at a loss here, as I've checked the whole exhaust system and can't find any leaks. The underside is a bit oily, but its nothing crazy, could I have possibly blown a seal that shoots oil onto the exhaust under load? Downpipe still looks clean too. Another thing I should note, I have almost no floor on the passenger side, which is on the list of things to fix. I've thought about repairing the floor and hoping for the best, but would rather fix the source of the problem instead of putting a band aid on it. Any input you might have would be GREATLY appreciated, as I love this lil truck and want to fix it up the way it deserves. Also, it makes first dates a bit embarrassing when the smoke starts rolling in lol Thanks!