PCV Routing Diagram - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
 
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post #1 of 15 (permalink) Old 02-25-2007, 05:41 PM Thread Starter
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PCV Routing Diagram

Anyone have a diagram or clear picture of the routing of the hose from the PCV valve on the drivers side of the intake manifold to the connection under the throttle body?
Took mine apart a few months ago, and not 100% sure of how it routes now.
I know the part of the hose that connects to the front of the manifold under the TB is a single 90 bend, but I have a 3-way connector at the PCV end. One goes on the PCV valve...not clear on where the other ends go.

Thanks mang.

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post #2 of 15 (permalink) Old 02-25-2007, 06:06 PM Thread Starter
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Yeah, I might also be screwed up thinking that the single 90 degree is at the front. Maybe it's what connects to the PCV and the 3-way is under the TB. :withstupi

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post #3 of 15 (permalink) Old 02-25-2007, 06:23 PM
CKJ
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Don't the pics on the fan shroud also include the routing of the PCV valve? I can't remember..?
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post #4 of 15 (permalink) Old 02-26-2007, 07:51 AM Thread Starter
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Yep, you're right, it's there, but it only shows a single connection at each end. It's the 3-way connector at one end that's got me stumped.

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post #5 of 15 (permalink) Old 02-26-2007, 08:01 AM Thread Starter
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This is exactly the diagram shown on my car. http://shbox.com/1/emission_hose_routing.jpg

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post #6 of 15 (permalink) Old 02-26-2007, 09:38 AM
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There should be no branches off the stock PCV vaccum pipe.
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post #7 of 15 (permalink) Old 02-26-2007, 10:03 AM
 
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3-way connecter I have no clue mine only has the 1 tube that goes from the under the tb to the intake where the pcv valve goes with no 3 way,you can eliminate the 3way,but I am woundering why there is a 3way connection
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post #8 of 15 (permalink) Old 02-26-2007, 10:18 AM
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Try and take a pic of the 3 way connector and post it on here. I think something is a little mixed up.

BTW: does anything look unusual about that underhood emissions routing picture? Shouldn't the FPR be on the right side of the engine (facing it) while the vettes and 93 F-bodies be on the left like the pic?
post #9 of 15 (permalink) Old 02-26-2007, 12:21 PM Thread Starter
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Thanks for sticking with me on this. Here are a couple of pictures of the pipe wit hthe connector and the manifold, just to put things in perspective.
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post #10 of 15 (permalink) Old 02-26-2007, 01:42 PM
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ok now my memory is staring to fade.. on my 94 Z, I can't see the fitting on front of the intake due to my intake boot still installed. But the PCV valve has this hose that makes a 180 and goes towards the back of the intake about 3 inches. But like i said.. mine is a 94. But I don't recall any T-type fittings on my 95 motor. Just a straight hose that goes from the intake fitting to the PCV valve.

Plus it looks like the hose is 3/8's or 5/16's rubber fuel line, and i can tell you, that ain't factory.
post #11 of 15 (permalink) Old 02-26-2007, 06:08 PM Thread Starter
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OK, I've got it figured out now. I actually found a picture that shows it before I disassembled, but the manifold was so greasy, it was hard to discern the black gunk from the black tubing.
You guys helped by confirming that a normal setup has no 3-way at either end, so at least I wasn't going crazy by not finding how this thing hooked up.
Turns out one of the 3-way ports was "plugged" up with a rubber stopper that had a small hole in the end. I'm guessing whoever did this put the 3-way on there because they needed a 90 degree turn, but had a 3-way laying around and decided to make do. Why this was done...I dunno.

I'm going to replace it with some new flexible hose.

Thanks again for helping me through this

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post #12 of 15 (permalink) Old 02-26-2007, 06:34 PM
 
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thats what we are all here for
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post #13 of 15 (permalink) Old 02-26-2007, 08:17 PM
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I'd recommend getting a factory hose from GM. And not a problem
post #14 of 15 (permalink) Old 02-26-2007, 10:36 PM
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Quote:
Originally Posted by CKJ View Post
Try and take a pic of the 3 way connector and post it on here. I think something is a little mixed up.

BTW: does anything look unusual about that underhood emissions routing picture? Shouldn't the FPR be on the right side of the engine (facing it) while the vettes and 93 F-bodies be on the left like the pic?
The FPR and EGR are basically on top of each other on 94-97 F cars. I am sure they just drew it that way for clarity.
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post #15 of 15 (permalink) Old 02-27-2007, 02:20 AM
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Ahh, good point Shoebox, i worry myself over nothing
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