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Registered
Join Date: Sep 2008
Location: Twin cities Minnesota
Posts: 295
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Vacuum leak
I was doing the smoke test on my 87 911 Carrera looking for a vacuum leak and found smoke coming from the bottom of the vacuum switching valve (the vacuum valve behind and above the oil tank filler cap). By chance does this valve vent overboard? Before I replace the valve I want to make sure it is bad. Any one have experience with this valve?
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07-09-2018, 05:52 PM
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Member 911 Anonymous
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Not familiar with your term, but if you mean the Ambient Air Valve, it is connected to the oil tank so if leaking I would change it.
Note this valve is not active until the temps on the valve behind the throttle body falls below 50F. 
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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07-09-2018, 07:54 PM
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Registered
Join Date: Sep 2008
Location: Twin cities Minnesota
Posts: 295
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Vacuum leak
Thank you for the response. Thati is the valve. It is leaking at the bottom fairly bad, I will order one tomorrow.
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07-09-2018, 11:22 PM
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Registered
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Location: Twin cities Minnesota
Posts: 295
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Vacuum leak
I failed to mention that I also found a leak at the throttle body. The leak is from the left side were the shaft is. Is there shaft seals or just bushings.
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07-10-2018, 08:04 PM
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Member 911 Anonymous
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Post a pic. not sure what shaft you are writing about.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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07-11-2018, 11:53 AM
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Registered
Join Date: Aug 2008
Location: sectors R&N, SE Pa
Posts: 3,117
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Shaft for the butterfly?
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Dan '87 Targa Carrera 3.2 - Fabspeed Cat Bypass, M&K Muffler, SW Chip Venetian Blue |
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07-11-2018, 12:14 PM
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Marble Grey
