Need help getting intake manifold off
Need help getting intake manifold off I'm in the process of pulling my stock LS1 intake to replace it with an LS6. I've been using ls1howto's guide and I have the front six bolts out and the rear four loose and just sitting back there. I disconnected the sensor at the back of the intake manifold but I couldn't find the vaccum line. Anyone know what side it's on or how they got to it? I can tell it's still connected because the intake will move forward a little bit it won't come out because something's catching in the back.
Is it the oil pressure sending unit you are getting caught on? That is the thing a lot of people break because I believe there is a vacuum hose wrapped around it. Check that, if you break it I think its around $30-40.
I'm not sure, I got my hand back there and disconnected something and made sure it was clear. Does the oil pressure sending unit have a plug that points to the passenger side? The write up says that there is a vaccum line on the back of the intake manifold I need to disconnect, haven't really felt where that is yet either. Anyone have a pic of it?
I put a little bit of painting tape around each of the bolts right under the washer so they're up. The intake manifold can move freely forward a few inches and lift up a little bit but it feels like something is catching the in the back and I can't really tell what it is.
Here's the LS6 intake from the back: Brake booster (left), sensor plug (center), and small vacuum hose connector (right).
http://www.thedetailzone.com/LS6intake.JPG
Here's another.
http://farm2.static.flickr.com/1321/...f2f3f74189.jpg
http://www.thedetailzone.com/LS6intake.JPG
Here's another.
http://farm2.static.flickr.com/1321/...f2f3f74189.jpg
Last edited by 99Bluz28; Aug 22, 2010 at 08:51 PM.
That happened to me to. I kept trying to pull it forward and it would come forward and even swing to the side a bit but was "catching" on something. It turned out to be a clip on the drivers side on the very back that was still connected back there to the manifold on the fuel rail. Just try your best to look and see back there while you are tugging on it a little to see where it's catching. I know it is tedious and irritating but if you try to yank it out you might break the oil pressure sending unit.
Also, did you disconnect the big brake booster hose from the brake booster? That big hose goes from the brake booster all the way to the back of the intake manifold. You need to disconnect that line from the brake booster and feed it through the back as you pull the intake out.
BTW, how are the shark teeth under the cowl treatin your arms?
Also, did you disconnect the big brake booster hose from the brake booster? That big hose goes from the brake booster all the way to the back of the intake manifold. You need to disconnect that line from the brake booster and feed it through the back as you pull the intake out.
BTW, how are the shark teeth under the cowl treatin your arms?
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Check the brake booster hose, may be catching on the OSU, and also unplug the OSU, that single wire can also get ripped out of the harness if your not careful. Also, there is a vacume line on the back of the intake that goes in from the pass side I belive, should be right under the connector you unpluged. Check all the wiring back there, stuff likes to get caught real easy, so that means you need to be real easy also. Another thing that came in handy for me was one of thoes extendable small mirrors, use it to look back behind the intake to get a better picture of what your messing with and actualy see whats getting caught.
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Verdad Gallardo That's a good idea on the mirror. I found the small vaccum line that's right under the connector and unplugged it. No the passenger side of the intake is in the clear and it's def something on the driver's side that still connected. The brake booster line is disconnected and I traced it and it's not the hold up.
I haven't heard of OSU before, what is that?
I haven't heard of OSU before, what is that?
Where is the OSU? At the expense of some skin I got my hand all the way back around the intake feeling for what needs to come off. Going off 99BluZ28's picture I felt the brake booster line connecting to the intake manifold. But it felt like there was another plastic piece that T'd into the brake booster line right where it connects to the manifold. It feels like this is what's holding on to the intake keeping it from coming out. Any idea what this is or how to get it off? Not really wanting to yank on anything that doesn't need yanking.
I believe there is a how to video a member on here made, I forget his name. Maybe what your looking for is in the video.
https://ls1tech.com/forums/generatio...old-video.html
https://ls1tech.com/forums/generatio...old-video.html
The oil pressure unit is a cylinder that is about 4 inches? tall. I think its the break booster that gets wrapped around it. Are you sure the back bolts are not just getting caught, I don't recall any vacuum lines holding me up besides the break booster. The rest of them have some give.
You're definitely catching the OSU. It sits between the intake and the brake booster hose. You have to disconnect its plug and then lift the back of the intake and scoot it forward over the top of it. If you have fat arms, try finding a skinny friend to help you do that so you wont end up looking like you got mauled by a bear.
This may be my problem, thanks for the help and the pic! I'm going to let my hands heal up some and check that out tomorrow after work. I'll lift the rear up first and get the brake booster hose over the OSU and I can't imagine anything else would keep it from coming right out.