Just bought a powder coated plenum. Supposed to have been off a 89. But it is not. I have removed EGR and smog pump from my 89. The plenum and TB are diffrent. Is the extra triangular shaped hole between the TB and plenum used for EGR? If not what is its purpose? Or is it part of the IAC. What will happen if I simply use my TB on this style plenum? Also the runners are set up for cold start. I hopefully can use a plug like a expansion plug for a block if I can find one to fit. If not wher can I buy a blockoff plug. Thanks
L98 plenum
Jan 04, 2006
1 Replies
The plenum seem like the one on my 88 vette that I just gave to my sister.The cold start should not be an issue it you plug it somehow, Maybe the 89 gaskets will seal it off. I don't know what the triangle cutout is for. I gave all of my repair manual to the new car owner.
cel
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required