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  1. #1

    Default Exhaust smell in cabin when window down

    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.
    1986 ACS McLaren Capri
    1971 Mustang
    1968 F100

  2. #2

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    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.
    1985 Mustang GT (Mothballed...Desired restomod parts acquired...Top of my project list for my 2024 retirement!)

  3. #3

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    Quote Originally Posted by 85GTGuy View Post
    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.
    1986 ACS McLaren Capri
    1971 Mustang
    1968 F100

  4. #4
    FEP Power Member mcb82gt's Avatar
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    Running cats?
    Mike

    Now stang-less.

    88 Cougar 5.0

  5. #5
    FEP Super Member gr79's Avatar
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    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.
    Last edited by gr79; 05-31-2023 at 12:28 PM.

  6. #6

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    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.
    1984.5 G.T.350 5.0 CFI AOD Convertible (TRX package, loaded)
    K&N filter in a stock dual snorkel, GT40 heads, Edelbrock 3721 intake, MSD 8456 Dist., MSD 8227 coil
    Comp cams XE254H, hypereutectic pistons
    Hooker Super Comp Shorty Equal Length Headers, catted BBK H-pipe, full custom duals
    Maximum Motorsports caster/camber plates and strut tower brace, 3.73 rear, dura grip (both Yukon)
    Ford Performance Springs, Firehawk A/S 225/55r16 on LMR TRX r390 wheels (street)
    Federal 595 rs-rr 245/40r17 and 255/40r17 on OE cobra r wheels (race)
    AOD rebuilt with a 6 clutch direct drum, Koline steels stacked with 8 clutches, Kevlar band, superior shift kit, new torque converter. --Everything else stock and fully functional.

  7. #7

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    no Cats
    1986 ACS McLaren Capri
    1971 Mustang
    1968 F100

  8. #8
    FEP Power Member mcb82gt's Avatar
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    I have no cats on mine, always get a smell unless i have the air on with windows up.
    Mike

    Now stang-less.

    88 Cougar 5.0

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