1968 Mustang exhaust leak

[wcm3232]

I have a 68 Mustang Convertible.  Every time we go for a drive in it we smell like exhaust fumes.  I have had the donuts replaced and can find no exhaust leaks.  Does anyone have any ideas as to what the problem is.  My wife will not ride in the car and that is a problem.

[racedraper]

well after all  you are in a convertable.lol  how is you exhuast routed? out the side or back. I thought the smell what is driving a classic is all about.
 By the way welcome to the site. lets see you stang

[1969]

If there is no leak you see maybe the smell is because the carburator is not good. Is the smoke black?

[wcm3232]

No black smoke and the car runs great.  A little sluggish in the morning but good.  What would I need to do to the carb to fix the problem if that were it?

[wcm3232]

The exhaust is routed out the back.  Dual exhaust and sounds good.  I tried classic car smell line on  my wife several months ago and it fell on deaf ears.  I have wondered before if there were some kind of back draft or something causing the exhaust to enter the cab.  A crazy idea but that is where I am with this.  There are a couple of openings in the firewall. Even without an exhaust leak, could this be the problem?  
Thanks for the help.

[gomer]

I'am  just thinking  outside the box here. How about the crankcase vent ,, you said the firewall has holes in it . It could be from that insted of exhaust . Can both smell the same.

[wcm3232]

I will take a look at that when I get the time. Thanks for the suggestion.   I am going to seem ignorant but where would the crankcase vent be located?  I am not a mechanic.

[gomer]

It's a host from valve cover to bottom of carb. Make sure P V C valve is working, pull it out and shake it . should have a rattle sound .  If not    replace it .

[1969]

I am not a good mecanician but if there is holes in the firewall they must be closed, I am sure the smell will be gone.

[gomer]

How true      but  must cars get fresh air from just in front of windshield. As air ffows over hood it hits windshield. This makes a high pressure area at base of it . It's forced into louvers between windshield and back of hood. And most hoods don't seal 100%. Air from engine area can be pulled into car.

[Ken Moore]

The exhaust you smell is more than likely rolling up into the trunk area and then through the rear seat. check the trunk seal and look for any rot in the trunk pan and rear fender wells.

my 66 hardtop does this also ,but only with the windows down. the arrodynamics (very little) causes a slite vacuum (I guess) in the cab and draws in air from wherever and of course it will be by the exhaust... go figure!    I have a small rot spot and bad trunk seal.  And no rear speakers just the holes.

[bernie]

Your exhaust tips aren't below the body line or not out the back far enough. I've had this problem on a 65 convertible, 66 convertible and a 69 shelby. Go buy pipes to extend  the tail pipes and the fumes will go away.