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Registered
Join Date: Jul 2010
Location: Where ever I am
Posts: 4,221
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Exhaust Fumes
Getting exhaust smell when driving with the windows up. In AZ that doesn't happen all that often but when it does it is annoying. Pic shows situation. Could I have cut the exhaust tips too short and the air from under the car is pushing the fumes into the car?
Other ideas? 
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'86 944T black/red, chip, fuchs 8's and 9's- Sold '97 Boxster silver/red, big mistake - Sold '99 C2, silver/black, RoW M030 - sold "69 912 white w/ '86 3.2L (like the pic, just not the pic) |
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11-24-2020, 01:34 PM
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The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,381
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do you have heat exchangers?
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All used parts sold as is. |
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11-24-2020, 02:00 PM
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Get off my lawn!
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Put on a catalytic converter and it will smell less. Roll up the windows and use the AC.
Yea, right.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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11-24-2020, 02:41 PM
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New-ish 911SC Targa Owner
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Yes. Add 2 or 3 inches to those tips and that will help.
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'83 Targa 300k w/ freshened 3.0 with 930/52 case# 6770540 ARP and Raceware hardware - AEM Infinity 506, Triumph T595 ITBs, B&B headers, Dynomax muff, Fidanza FW, Alum PP-203whp |
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11-24-2020, 05:08 PM
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Registered
Join Date: Feb 2009
Posts: 1,012
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Close your rear 1/4 windows, believe it, exhaust backwash.
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11-24-2020, 05:13 PM
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It's a 914 ...
Join Date: Jan 2008
Location: Ossining, NY
Posts: 4,742
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As I suspect mestein is getting at, old/damaged heat exchangers can sometimes cause exhaust fumes to get in the passenger cabin. Watch out for CO if that's the case.
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11-24-2020, 05:32 PM
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The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,381
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Quote:
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All used parts sold as is. |
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11-24-2020, 07:20 PM
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Registered
Join Date: Jul 2010
Location: Where ever I am
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Thank you for all of the answers/suggestions. Bought the car in '11 in Petaluma with no heat exchangers. Took it back east in '13 and had them added, since I would need heat. So the units are not that old. I will of course check them. The issue really shows up with all windows up and the 1/4 windows closed. Rear deck is just held down with the rubber straps.
Will go for a little run today. Cool enough in AZ to have the windows up
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'86 944T black/red, chip, fuchs 8's and 9's- Sold '97 Boxster silver/red, big mistake - Sold '99 C2, silver/black, RoW M030 - sold "69 912 white w/ '86 3.2L (like the pic, just not the pic) |
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11-25-2020, 06:17 AM
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The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,381
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Are your heat exchangers new SSI’s or used steel ones.
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All used parts sold as is. |
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11-25-2020, 01:14 PM
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abides.
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Does it happen when you are driving or stopped?
Do you have seals around the engine tin?
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Graham 1984 Carrera Targa |
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11-25-2020, 01:58 PM
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Registered
Join Date: Jul 2010
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they are used steel. Stopped or driving. Moving along seems to make things better. Need to verify the compleleness of the tin seal
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'86 944T black/red, chip, fuchs 8's and 9's- Sold '97 Boxster silver/red, big mistake - Sold '99 C2, silver/black, RoW M030 - sold "69 912 white w/ '86 3.2L (like the pic, just not the pic) |
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11-26-2020, 07:02 AM
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Registered
Join Date: Mar 2004
Location: Higgs Field
Posts: 22,652
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There is a rubber boot that goes between the nose of the transmission and the hole through the back of the tunnel where the shift rod goes through. If this is missing, dislodged, or torn, fumes can get into the cabin. Pop the cover over shift coupler and take a peek.
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Jeff '72 911T 3.0 MFI '93 Ducati 900 Super Sport "God invented whiskey so the Irish wouldn't rule the world" |
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11-26-2020, 11:11 AM
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Carrera
Jeanine
1984 Porsche Carrera Targa
