As I am well on my way to almost finishing my TPI conversion I have a few questions. Where do the Vacuum ports on the Throttle body go to? throttle body is off a trans am with TPI

 

There's only one vacuum port on the throttle body; it's on the bottom. This port is tee'd - one side goes to the vapor canister. The other side goes to the EGR solenoid.

The only other "vacuum" port is the large one on the passenger side for the PCV system.

 

Bottom port ;pass side, is vac for canister purge.Just seal off.
Top one ;pass side, is supply air to pass side rocker cover for PCV system
Generally if running MAF system need this hooked up properly so airflow though PCV is metered by MAF .Running a open breather on one rocker cover and the PCV valve on other is same as un-metered vac leak

 

i just did away with the egr. and blocked up the vacuum line. once and a while i get the code for it because i didnt get tuned yet but my egr was pretty much a vacuum leak

 

check out this thread i made about the same problem, it should be very helpful for you if you havent figured it out yet, along with some good pics from some of the guys that they posted up, and pics from me as well. hope this helps

https://www.thirdgen.org/forums/tpi/...-tpi-code.html

 

thank you that helped out alot, i dont have an evap canister on my car i got rid of it a while back. Do i need it? What does it do?

 

Pollution control
Stops you being a naughty boy and polluting the atmosphere with all the gas fumes from your tank.

 

I have the fuel line vented out of the car, so I should be ok without the canister right.