Quick question.......I am working on a friends 1987 z-28 H engine code. I found that his Vacuum sensor (map on my TBI) didn't have a vacuum line on it, does it need to be there and where on the Carb (q-Jet) do I run a line to. May be called a Baro?


Thanks
Brian

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1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb

 

I've just been messing around with this same item myself. To answer, yes, the MAP or vac sensor needs a vacuum line on it from manifold vacuum. Mine's hooked up in the stock location, back of the carb base on the small port. Just to clarify, the vac sensor is the one on the firewall in front of the driver's side. The baro sensor hangs on the passenger side upper lip of the firewall, and does not have a vac line on it 'cause it's measuring atmospheric pressure instead of differential pressure. (but on my setup, I did run a line to a port that's right in between the secondary air doors on the air horn, but not all Q-Jets are equipped with this port)

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D.R. Stevens
1984 Trans Am 305HO L69
all the usual external/free mods, original engine
1991 Firebird 305 L03
bone-dead-slow-stock

 

Thanks so much for clearing this up, its new to me I am more schooled in tbi after my project. I ran a line to it and the car is running good........but it didn't run bad without it.

Brian

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1989 Camaro RS

305 .030 over Hydro Pistons
Vortech heads milled to 58cc...Performer RPM intake....LT4 cam..Crane Gold rockers...FastChip custom chip...ALum. Driveshaft...3.73 gears with Posi...underdrive pullys...Rebuilt 700R4 with Vette Servo and B&M shift Kit...MSD ignition...A/C Delete No SMOG junk....1997 SS leather interior...B&M Shifter... Ultimate TBI mods...14X3 K&N open Element Non-Drop...Hooker headers....3" exhaust with Flowmaster Cross flow 16X8 Wheels from 97 RS Spohn LCA's Spohn Panhard Bar..LETS PLAY FORD!!

www.geocities.com/feltsb