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C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

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  #1  
Old 11th April 2005
Hagman Hagman is offline
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Join Date: Feb 2005                                                
Location: Flint, Michigan USA
My Saabs: 1985 900 Turbo 16V 4dr sedan 5spd
Posts: 19
Default vacuum line

Does anyone know where the vacuum line connects that comes in through firewall down by the clutch pedal?There's a "Y" fitting and one leg is real short,only about four inches and I can't find where to plug it in. Access down there really bites too.

Thanks, Hagman
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  #2  
Old 11th April 2005
Orca Orca is offline
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Join Date: Mar 2003                                                
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One leg goes to the fuel cut-out switch for overboost protection, the other to the dash boost gauge. The leg that goes to the fuel cut-out switch passes through the switch and then onto the pressure transducer. That's the bit that "tells" APC what the pressure is. Be aware, the fuel cut-out switch is often bypassed.

You can see a lot more of what is going on down there by removing the LHS speaker grille. Just unclip the heater flue and pull it to one side. Remove the speaker grille and you should have light and access down to the area.

This link from the excellent 900 Aero dot com site has some pictures of the relevant bits that you'll find down there.
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  #3  
Old 11th April 2005
Hagman Hagman is offline
Junior Member
 
Join Date: Feb 2005                                                
Location: Flint, Michigan USA
My Saabs: 1985 900 Turbo 16V 4dr sedan 5spd
Posts: 19
Default

Thanks for the help, Orca. I was finally able to find the spot for connecting the hose. Now boost gauge works again and I did away with annoying sucking sound.
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