logr Posted May 11, 2012 Share Posted May 11, 2012 I searched but couldn't find this anywhere so thought I would pass it on. I have been fighting exhaust in the cabin on my 240 but only when driving with a window down. It has been driving me crazy and from my searching, it is common and usually accepted as part of owning a Z. I have an SR that is fuel injected and clean burning, getting over 30mpg. The exhaust goes to the stock location. The hatch seal is new. The tail lights are sealed. All holes are sealed. It still smelled very badly with a window down UNTIL I found the rear frame rail that runs side ways under the tail lights was not sealed underneath the car anymore. It is still sealed into the cabin from the top but after much checking I found that there is a hole on each end(rearmost part beside the tail lights and inside the side panels but all the way at the rear bottom)of the rail. You can not see it but you can feel it on both sides. I stuffed some plastic sheeting in both ends to seal it off. This is the same tube that the rear tie downs are bolted into. I blew air into one of the tie down holes and felt it come out the bottom of the car and out of both ends inside the car. That is what convinced me to close off the ends. It solved the exhaust smell completely. I CAN DRIVE MY Z WITH WINDOWS DOWN AND NOT SMELL EXHAUST. HIP,HIP,HORRAY Moderators, I did not know where to post this so feel free to move it or delete it if I am the only one that did not know this. Link to comment Share on other sites More sharing options...
z240 Posted May 11, 2012 Share Posted May 11, 2012 Excellent find! I do not remember anyone reporting this so far. I found these same holes/gaps when stripping the under belly of my 73 this winter. Looks like the seam sealer that was applied in this area ran a little short..... Both sides were remarkably similar in the way the adjacent sealer bead just stopped a bit short..... I took pictures, I'll have to post them. I remember a thread a few years ago on CZCC about a frustrated guy that used a smoke machine on the outside and a sealed interior wiht a vacuum attached to watch where smoked flowed into the cabin. He mentioned the same "It was coming through the dang seams!!!" observation. Link to comment Share on other sites More sharing options...
Leon Posted May 11, 2012 Share Posted May 11, 2012 Excellent, I need to check this out. I'm tired of inhaling fumes when I want the window down. Link to comment Share on other sites More sharing options...
GOTHALOSISM Posted May 12, 2012 Share Posted May 12, 2012 Wonder if its the same for the 280's... I'll have to check thanx! Link to comment Share on other sites More sharing options...
logr Posted May 12, 2012 Author Share Posted May 12, 2012 (edited) It is an easy check. Pull a rear tie down bolt out and shoot in compressed air. If it hits your feet, there is a problem. The only question then is if the rail ends are open inside the car. Glad this is a help. Edited May 12, 2012 by logr Link to comment Share on other sites More sharing options...
Six_Shooter Posted May 12, 2012 Share Posted May 12, 2012 (edited) I picture or more would help to identify the area. I'm not sure what you mean by "rear tie downs," so I'm not sure I understand where to look. Funny how "there's nothing new in the world of Z-cars", and yet, here is something new. Edited May 12, 2012 by Six_Shooter Link to comment Share on other sites More sharing options...
logr Posted May 14, 2012 Author Share Posted May 14, 2012 There are either bolts, bolt holes or tie downs at the back of the floor, right up against the tail light cover. If there are holes, plug them to stop another leak. There are 2 bolts on each side of center about a foot out. Link to comment Share on other sites More sharing options...
Mike kZ Posted May 15, 2012 Share Posted May 15, 2012 Moved to FAQ > Troubleshooting Link to comment Share on other sites More sharing options...
wrcbonk Posted May 15, 2012 Share Posted May 15, 2012 Great work Logr, have the same issue with my efi 240, can't wait to see if that fixes my issue. Bonk Link to comment Share on other sites More sharing options...
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