I read the previous posts on this and there was someone trying some customized tip lengths and shapes to help solve the exhaust fume problem.

I'd like to know what results he got if he's still around here and can post them.

I've go a 73 240 I've had since '76. Its always had an exhaust fume issue with the window(s) down. Since here in Texas we usually always have the AC on its really not much an issue. However, lately the ac is on the fritz and besides it sure would be nice to have a breeze and not be smoked out.

The exhaust is an old turbo flow 2.5" from Motosport a long time ago. Basically a big muffler on the end. It has held up remarkably well. I should say that I've also had Monza and stock exhausts and they had the same fume problem.

I can't find any obvious gasket voids. My most recent effort to fix it involved caulking around the fuel tank downspout on the rear back corner as it comes into and out of the car on the way to the fuel tank. There was quite a bit of light showing thru there. Everthing else from tailights, hatch, hatch gaskets seem to be in good order. Not new but not rotten either. That helped some but I still smell it with the window open.

I have never tried the tailpipe extension trick so I'm about ready to try that. At the moment the tip goes about 2" beyond the tiny rear bumper. I've noticed some vehicles with exhausts that come straight out then curve down so that the exhaust tip is perpendicular to the air flow of the vehicle. So I was wondering what if any experience have people had with the curved tailpipe extension and direction change. Curved down or curved to the side. You could make it go either way. And suggestions on max length to start with would be appreciated.

I suppose someplace like a generic muffler shop would be the best place to get something bent like this. I know it won't look cool but I'll try to fix that later after I can breathe while I drive.:sleepy:

The AC needs a new idler pulley and that is in the works.

tks

Don

My Z started showing the exhaust issue back in about 73, so I didn't think it was the seals on a 2 yr old car. Eventually, someone convinced me to have an extension made which bends to the side and directs the exhaust into the air flow along the side of the car. It has worked ever since. The car has the original exhaust except for the rear muffler. I am thinking of getting a new extension made which will look a little better than the old one.

My Z started showing the exhaust issue back in about 73, so I didn't think it was the seals on a 2 yr old car. Eventually, someone convinced me to have an extension made which bends to the side and directs the exhaust into the air flow along the side of the car. It has worked ever since. The car has the original exhaust except for the rear muffler. I am thinking of getting a new extension made which will look a little better than the old one.

Then why do i,with a 36 year old car,who's tip is flush with the bumper have no issue?

This means that you're saying every Z car had this issue.

I did not say that but, you can if you want. Of the four cars with this problem I have worked on all four were cured the same way. Entend the muffler outlet pipe..

I did not have this problem with mine for years. I had to replace the muffler and then it took a year to figure out where the smell was coming from. My stock muffler had a chrome tip on it the replacement did not. Replaced the tip and no more problem. It could be as simple as the location of the outlet on the muffler itself.

FWIW

Then why do i,with a 36 year old car,who's tip is flush with the bumper have no issue?

This could be due to various causes, and possibly not if they don't apply:

1) You're a smoker and aren't sensitive to exhaust smell. No flaming intended, just an observation that since I quit smoking my sense of smell seems better.

2) Your job at the railroad exposes you to stronger fumes than what you smell in the Z and therefore don't notice it.

3) The humidity (or lack of it) in your part of the country (AZ) creates different effects. In the NW with all the moisture, we get moss and mildew, and they can smell pretty strongly, yet some people don't notice it. I'll bet that you might notice it.

4) As Jim mentioned, the location of your muffler tip in relation to the bumper and other items on your car may be affecting the air flow around your car such that the exhaust isn't a problem for you. Maybe you have larger mirrors, or larger mud flaps, or larger tires, or you don't drive with the windows open, all those are possibilities.

The end result is that just because you don't have the problem as stated, while other people and cars who have had that problem have found this solution works for them, is no reason for you to deny that the solution is correct for them.

2¢

E