Gutz

Hi i have an 89 GTA with a L98.I had a intake leak last summer and just got it back together last week-end.I have two questions for you guys.On the passenger side on the rear side of the plenum there are two barbed ends.One bigger and one smaller then the other.Where do these go?Then on the drivers side base manifold in between where the runners seperate there is a big barb that comes out off base manifold.What goes here?I've seen a couple of pics of the pcv valve going to this but my pcv goes to my brake booster.Thanks for your help.

jugheads88gta

i have the same problem but i cant figure out where any of the vac lines go to

3.8TransAM

Bigger of the 2 barbs on the rear is for the brake booster.

The one from the base itself between the runners on the drvr side is for the PCV.

Thats how it is on my 91's which are Speed Density.

I want to say your extra one on the rear is for the vacuum lines for the interior like the flapper ducts for the AC system vents. On a SD car it comes off the right side of my plenum and is located next to the FPR line as well.

Like I said, for you MAF guys I am running on memory.

Hope it helps

Gutz

Thanks for the help, but it must be different between maf and sd.

jugheads88gta

okay so i found where all the vac lines go to the larger one one the plenum nearest to the firewall on the pass side goes the the little pump looking thing on the back of the fuel rails and the one right in front of it goes the the bracket the goes under the ign coil i if that helps any.

1989IROC-Z5.7L

iTrader: (2)

This is what I found.

Hope it helps!

jugheads88gta

yepp thats how i furgured it out its in the repair book almost the same pic