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WTF?!?!?! Vacuum line through firewall??
I've been having vacuum problems that have led to an inconsistent idle since I got the car running a week or so ago.
I also discovered several oil leaks, probably due to dried out gaskets and such from the car sitting for a while, so I'm in the process of dropping the engine to go through it an replace the gaskets, belts, etc. In the process of disconnecting the harnesses along the firewall in the engine compartment, I noticed a "Y" on the purple vacuum line that runs along there and that it has a hose that routes through the firewall into the cabin smack dab behind the back of the motor. Any ideas what the heck that would be for? Never would have seen it had I decided not to drop the motor.
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"Making things easy is hard work" My current stable: 1991 Carrera 4 Cabriolet, 1992 Mazda Miata, 2004 Lexus RX 330, 1994 F150 4x4 Supercab Also rans: 1977 Carrera 3.0 (traded for C4 Cab.), 1983 944 (project car - sold) |
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08-26-2009, 09:23 AM
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Join Date: Jul 2004
Location: Upstate New York
Posts: 3,261
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Operates the vacuum motors in the HVAC system (under the dash).
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Good luck, George Beuselinck |
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08-26-2009, 09:49 AM
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As George said.
Having dropped and installed the engine lately, there are two lines. One with a Y is the vacuum source. The other line operates the heater valve.
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1993 964 C2 still makes me smile Retired and work as needed as a pain in the **s. |
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08-26-2009, 10:02 AM
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OK. Glad to know I'm not crazy. I was really thinking the PO was doing some odd stuff. Love how porsche doesn't really include this info on the vac routing diagram, either. It's pretty damn vague.
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"Making things easy is hard work" My current stable: 1991 Carrera 4 Cabriolet, 1992 Mazda Miata, 2004 Lexus RX 330, 1994 F150 4x4 Supercab Also rans: 1977 Carrera 3.0 (traded for C4 Cab.), 1983 944 (project car - sold) |
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08-26-2009, 10:14 AM
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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,494
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Quote:
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Edek '87 924S '91 535i |
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08-26-2009, 03:44 PM
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Posts: 5,179
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It's better than a toyota 4a-f diagramme:
 I've lost years off my life due to the vacuum carb system on that engine.
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M |
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08-26-2009, 07:34 PM
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Carrera 4 Cabriolet
944
911
