Exhaust smell in cabin when window down

[york0060]

I seem to be having a exhaust smell inside my car when I am driving and can't seem to find where it is coming from. Are there any common places to look that are problem areas for exhaust intrusion? Just for reference, i have Flow master pipes, X-pipes and tail pipes all the way out the back. Thanks for any help.

[85GTGuy]

The fuel filler pipe seal on the hatch floor where the filler pipe passes through the floor comes to mind.

https://www.npdlink.com/product/seal...1985&year=1985

Also, is your hatch weatherstripping in good shape?

Or just keep your windows rolled up.

[york0060]

The fuel filler pipe seal on the hatch floor where the filler pipe passes through the floor comes to mind.

https://www.npdlink.com/product/seal...1985&year=1985

Also, is your hatch weatherstripping in good shape?

Or just keep your windows rolled up.

Rear hatch weatherstripping is brand new. I'll hatch to check the filler pipe seal, I know its original.

[mcb82gt]

Running cats?

[gr79]

Mine does that too depends on speed and how much window is down. Even when car was new.
Does it more with only ds window down. Resealed back hatch and rusted areas best as possible.

There is positive pressure inside with windows up, blower on lo, or using A/C.
Aerodynamics and negative pressure in cabin suck smell in. Vacuum.
Read somewhere (owner's manual?) the hvac blower runs automatically on low in floor/defrost mode because of this.

Bad taillight gasket seal, rusted out holes, gaps, rear underbody sheet metal or wheel well.
Station wagons did same with tailgate window and front windows open. Rear roof spoilers helped i think.

[emerygt350]

Tail light seals is a great suggestion, how is your air pump for the cats? Gone? I had mine rust and create a cabin exhaust smell.

[york0060]

no Cats

[mcb82gt]

I have no cats on mine, always get a smell unless i have the air on with windows up.