hello
i have a 1990 trans am and wonder if anyone out there has resolved the stinky exhaust smell old cars have...i would like to roll the window down when driving but the car gasses me out...its not running rich...im suspecting the cat needs replaced but not sure.

 

I am running an off road pipe and have no issue with the smell. Maybe it is running rich? Or you have a leak somewhere?

 

Check your exhaust manifolds if you don't have headers. They tend to warp and impossible to stop the leak after they do. Headers are the way to go. Try the swap. If they aren't warped, tighten the bolts with a 7/16" socket. Oh and get new gaskets for it, that could be a problem too. Header gaskets will work.

 

Its your cats

 

i just picked my 85 up from missouri yesterday and it had an eighth a tank of gas left in it so i filled 5 gallons of premium and dumped some gum out in the tank but it smells hooorible lol, partially bad gas and the other smell iicouldnt place it was in the drive way and stunk up the whole garage cant wait to tear into it! will be taking said advice about the cat though.

 

If it smells like sulfur its cats.

 

stinky exhaust smell: resolved......i had to put up with this for a long time until i sat in my living room thinking bout it one nite and seemed to me like when i started using the private lable gas from the new station that moved in down the road is when the trouble started....im back to using shell gas and the smell is greatly reduced ....it think it will take several tanks of the good gas to bring the car back like it used to be and im really enjoying driving it again.

 

My exhaust reeks, I don't have cats so the alcohol in pump gas burns my eyes. I remember folks running a cherry scent additive in alky cars so people in the crowd at car shows didn't gag.

Changing the brand may or maynot help some people, but the condition of your exhaust and emissions system will have the greatest impact.