Smell like exhaust after driving.

[David T]

Not every cat is bad. Most Deloreans don't have the mileage to wear them out. I would suggest the majority of the ones that are bad are bad because the fuel system had problems from lack of use, the motor ran overly rich, and overloaded the cat. A mal-functioning cat can cause a lot of odors like "old car smell".

[Michael]

Not every cat is bad. Most Deloreans don't have the mileage to wear them out. I would suggest the majority of the ones that are bad are bad because the fuel system had problems from lack of use, the motor ran overly rich, and overloaded the cat. A mal-functioning cat can cause a lot of odors like "old car smell".

In summary, not every cat is bad, except the ones that are bad.

[Ron]

I have had cars like that(67 Olds 442). Hated it, especially on date night. Just venturing a guess but on a D, my first guess would not be exhaust but be raw fuel getting into the cabin either from the fuel pump area through the ac vent intake or coming up from the fuel accumulator area.

{Cue Mike}