I had the same problem with my 89 F150, I did all the same things you have so far. A friend told me it was my O2 sensor but that repair was beyond me so I just live with it. I belive that repair is in the Chilton manual but involves getting in around the exhaust manifold and such.
Yes it could be the rear tail pipe.like the old blazer if the back window was out the fumes would backlash into the cap.check the muffler connections from one end to the other
when did you start smelling this burn't fume smell? I know you said you replaced the pipes but if it is a fume smell then it is a exhaust problem. Does the fumes smell rich like new gas or is it like the smell that comes from the tail pipe? There could be burn't valves in there too. the smoking on start up is fuel caught in the piston which means the rings are letting the fuel in and trapping it inside the chambers when the truck is off. this is caused by a faulty carb a needle valve not closing all the way. let me know.my name is Larry my e-mail is [email protected]
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exhaust is still in good shape. had it replaced from the header all the way back about 2 years ago.
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