Mystery capped fitting behind tb

[mandingo]

Behind the TB there are two fittings the one on the bottom is hooked up to my PCV for vaccum, what is the one above it, mine has a rubber cap on it, did some searching and couldnt find anything

 

[willyson]

Re: Mystery capped fitting behind tb

not used, should be capped.

 

[Loeryder]

Re: Mystery capped fitting behind tb

It is a coolant passage used on the LT1 motors that TB was also found on.

It had to do with heating the TB with engine coolant to prevent cold weather problems.

 

[jslezak83]

Re: Mystery capped fitting behind tb

its actually for the canister purge on the TPI V8s. these are the same throttle bodies, so that is why its there.

 

[TYRODD]

Re: Mystery capped fitting behind tb

Yeah I fixed that...

 

[Z SKI]

Re: Mystery capped fitting behind tb

Yeah I fixed that...

me too, i will post pics later

 

[Flyin Ryan]

Re: Mystery capped fitting behind tb

Just use it as leverage when you have a race lined up.. point out that you even may have some small vacuum leaks

 

[jjorgensen52]

Re: Mystery capped fitting behind tb

Whoever said it, they are in fact TPI V8 throttle bodies. The LT1 motors use the newer style TPS and IAC parts, and for that reason we cannot use the LT1 58mm BBK throttle body