I'm trying to sort out all the vacuum ports on my 89 TPI and I'm stumped. On the right side of the throttle body there area two ports; large and slightly smaller. I know the larger one (on top) is for the line coming from the right side valve over but what does the smaller one go to?

Thanks,
Roy

 

The top one goes to the breather on your passenger side valve cover. If thats no longer there, just plug it. The lower one loops beneath the throttle body and connects to the charcoal canister. Don't forget the small nipple on the bottom of the throttle body, that connects to the egr solenoid.

 

rezinn,

Thanks. Since I'm installing the motor into a 68 Camaro, the charcoal can and smog pump are gone. So, I guess I can just plug it off.

Thanks again,
Roy

 

Mr. F,

Maybe this would help:



You probably don't have one stuck to the underside of the hood on your '68...

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Later,
Vader
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Justice and Freedom will Prevail