Plenum vaccuum line connection...

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Apr 13, 2003 | 09:01 AM

Germ

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Joined: Jul 1999

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From: St. Louis, MO

Plenum vaccuum line connection...

Quick question: There are two vaccuum line connections at the back passenger side of the plenum. The smaller is for the line to the fuel pressure regulator, whats the larger (further rearward) one for?

Apr 13, 2003 | 09:37 AM

NastyL98_T/A

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Joined: Mar 2003

Posts: 1,301

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From: Severn, MD.

Car: '88 T/A and '90 T/A

Engine: LB9/383

Transmission: T5/700R4

IIRC, it goes to something related to the smog system. Either the a.i.r. divertor box or the charcoal canister.

Apr 14, 2003 | 11:18 PM

BOTTLEDZ28

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Joined: Sep 1999

Posts: 3,871

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From: Mass

Engine: 350 TPI

Transmission: A4

Axle/Gears: 3.23

Is it the same plenum that has always been on your car? I ask this because I have a speed density setup and I also have 2 fittings and the other one you mention is used for the MAP sensor on mine.

Apr 15, 2003 | 11:12 AM

Germ

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Joined: Jul 1999

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From: St. Louis, MO

Yep same plenum since '87, but its a MAF car, so I'd guess thats the difference.

Apr 15, 2003 | 11:46 AM

Bruce89TA

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Joined: Mar 2000

Posts: 120

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From: Dallas, Texas

Car: 89 Firebird T/A

Engine: 305 TPI

Transmission: 700R4

Mine feeds the heater controls and the cruise control as well as the vacuum resevoir on the driver's side fender.

with the supercharger, it also feeds the boost gauge, the fuel management system and the diverter valve.