1985stang

I hooked a vacuum gauge tothe pcv port onmy carburetor and I was wondering if youguys to help me analyze the reading. It's readingexactly at 15 Hg at idle. The needledoesn't bounce or moveso i'm happy about that, but I was wondering why it was low. My timing is set right around 12*. I tried bumping it a little, and that rose the vac. maybe 1 Hg at most. I'm only running 89octane.If i understand what i've read, it should be around 20 Hg. What would cause it to be low, and is thismakingmy car run worse than it should be? I'm still getting a feel forthe carsince i got the new carburetor.

Joel5.0

Need to take the vacuum reading with the controlled vacuum leak the PCV is, or not removing it...... suggest to use the brake booster hose.

1985stang

So I shouldn't use the PCV? Isn't it just a direct manifold source?

FivePointOhh

on the typhoon intake manfold the two vac ports on teh side of the intake neck deal....can you hook up a boost/vac gauge that?

and yes dont use PCV source, use break booster.

WhiteWindsor

15 is awesome, i have seven with manual brakes.

Joel5.0

My bad..... if you don't have a functional PCV (breathers only) installed......[sm=itsok.gif] ..... if you have a PCV valve setup, then no......you should use an alternate vacuum port.