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Posted by Bill Henderson Number two, I tucked the exhaust as far up under the car as I could and experimented with all sorts of downturn tips till I got the exhaust to stop (what I assume) was swirling under the car and sucking back in. Turned out that keeping the tips under the car, turned somewhat down and not sticking out the back worked the best.
on 11/1/2009, 11:03 pm, in reply to "interior exhaust smell"
72.94.160.130 | Message modified by user Bill Henderson 11/1/2009, 11:09 pm
I posted a LONG piece about two years ago with an identical problem-- identical car-- and how I went about solving it. These cars are highly susceptible to exhaust smell. I suspect it has something to do with air flow over and under the car creating a vacuum someplace.
In my case, it really got worse when I lowered the car, and I suspect that this must be related to airflow.
In the end my solution came from two things-- sealing EVERY hole under the car to the interior - from the engine compartment, the trunk and underneath-- and I mean EVERY ONE. How I did this-- While the car was gutted, I put a bright light inside the interior shell, shut out the garage lights at night and lay underneath and either welded or seam sealed shut every tiny gap. I also replaced the door and trunk lid weatherstrip, and made sure the thing was tight as a drum. I imagined it should be able to watertight as a boat if I needed it to! Yes, it was a HELL Of a lot of work-- but I had enough. My wife wouldn't ride in the car, and my clothes reeked after I drove even a little while.
It also really helps if your carb is well tuned so that you are not running rich and there is less smell in the first place.
I wish I could find that series of posts I made, but it must have fallen off the board's history.
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REMEMBER!!! When posting a question about your Mustang or other Ford on this FORD MUSTANG FORUM, BE SURE to tell us what it is, what year, engine, etc so we have enough information to go on.