So on my 82 fj60 I’m getting a exhaust smell in the front of the cab, seems as though is coming through the vents when the heater is on fresh air but when I switch it to recirculating it’s not as bad. So now when the front windows are down it’s almost unbearable. I’ve checked the exhaust and there doesn’t seem to be any leaks. Also my fj is partially desmogged I guess you could say, the previous owner removed the air pump and the hoses that go to the air cleaner and fuel rail. Any help is much appreciated