Help with my supra

87 toyota supra turbo

Can anyone help me with this problem, as soon as I roll down my windows, i smell exhaust fumes and gas fumes. Can anyone tell me what might be the problem? Thanks!

Umm, your running rich, you have an exhaust leak, and you probably overfilled the gas tank? Either way it's not going to be a problem, unless gas is leaking onto your exhaust manifold or you have a hole in the tank. If you don't like the exhaust smell then either fix the leak or get one of 100 "smell additives" that makes it tooty frooty.

Running too rich, could it be that a BHG could cause the problem? Also, when I take out my spark plug wires and plugs, there would be oil all over it. Would that mean a replacement of all gaskets?

BHG does not cause you to run rich, the MKIII natrually runs pig rich, if you don't like the smell of gas maybe an electric car would be a good choice. :) Oil in the plug valley means your valve cover gaskets are bad/leaking, buy two new valve cover gaskets, clean the oil out, then put them in and torque the screws/bolts to 22ft lbs, no more, no less.

Electric car? Lolz...cant compare to my mkIII supra..well i was just wondering because my bro has a supra also, but his dont smell like mines, I mean it just started to smell really bad, when the new cat back exhaust was put on. Any tips on getting the smell to go away would be nice.

exhaust fumes might be from a bad exhaust gasket maybe from the turbo elbow of the one below the car on that catalytic converter. not sure about the gas fumes though, as i would be afraid to drive if i smell it, as i might run over a lit cigarette and the car may burn, haha, worst case scenario.

Yes, getting rid of the cat will introduce some new smells, some people have even gotten a rotting egg smell because of bad cats. Like I said the easiest thing to do is to buy some gas scent additive and put alittle in with each fillup, if you know what your doing tuning wise you can lean it out, but only if you have a true wideband and you exactly what your getting into as it's a good way to seize/melt an engine. When you floor it do you get lots of black smoke? Either way it's not dangerous, nor is it a problem, just an irritation to some. Did you put in all new gaskets when you did the cat-back?