ok I dont know what this thing on the TPI is called. Its like round and right under the top of the TPI. I think its in the middle of the manifold. Well there is like a vacum line going off it going towards the passenger side, but there is a screw in it. I was just wondering whats the function of that thing and when having that screw in it what does it do?

 

How far under the plenum is it, I think it sounds like you're describing an adjustable fuel pressure regulator, there is only two things under the plenum that have vacuum lines: The Fuel pressure regulator and the EGR valve...... And if the FPR has a screw on top of it, it's adjustable...

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ZaphodB a.k.a Carl Andersson - zaphodb@faxancruisers.org
'89 Camaro IROC-Z 5.7L TPI - Mods under construction :-)
Custom ARAP Chip Under Development/180 t-stat, Edelbrock TES Headers,
SLP Airfoil, K&N Filters, Accel 8mm wires, Relocated MAT, AFPR @ 45 PSI

 

well I know its not the regulator I think its the EGR then but it has a vacum line coming off of it but it doesnt go any where someone put a screw in the line to plug it. I was wondering by having the line plugged what difference that makes.

 

oh ya I havr removed all my emissions too..the pump and everything else like the air tubes and all...when I re built the motor

 

The EGR's mian function is to control emmisions by lowering the combustion temperature, so if all the emissions eqpt. is removed it should be fine. I ahve heard somewhere though that hvaing the EGR disconnected sometimes results is a small loss of power.

 

well ok good I dont need to worry about it cause I was worrying it was making it run rough.