420A Upper Intake manifold questions?

[badgoose]

Looks like there’s way too many vaccum lines attached to this thing. Some of these lines literally are routed to the other side of the upper manifold and connected back to it. I know that’s not correct. I am curious what everyone else has on there’s. Does anyone care to upload pics? I notice I’m missing a pcv. The spot for the pcv was routed to the top of the valve cover which would normally be connected to the intake assembly.
I work better with pictures

 

[BLACK'98DSM]

I'd love to take pictures, but my setup is too far from OE to be helpful in any way. The 420A DSM vacuum system is actually quite simple, though it looks like a tangled mess once someone screws with it. There was a diagram sticker on the under side of the hood from the factory, but it is primitive and yours may be missing.

So, let's break it down. On the backside of the upper intake manifold there is a 3 way fitting. The nipple nearest the driver side of the car should be plumbed directly to the EGR solenoid, just below the exhaust camshaft. The nipple nearest the passenger side of the car should be plumbed down towards the bottom of the firewall to a hardline, which would further run to the back of the vehicle. That's for the EVAP leak detection pump. Just look for whichever hardline has nothing connected or a free hanging hose and that's where it should go. The middle nipple should be plumbed down below the lower intake runners to a black vacuum reservoir. And if your car is equipped, there should be a line from the black vacuum reservoir over to the backside of the cruise control servo. Now, there is also one vacuum port on the throttle body. This should be plumbed across the backside of the intake manifold and connect to a hardline on the passenger side strut tower. It's for the EVAP purge solenoid, which is mounted behind the front bumper.

The rest should be almost self explanatory. The only other nipple on the backside of the manifold is for the brake booster, and the only other nipple on the frontside of the manifold is for the PCV valve. The fresh air intake nipple on the valve cover is literally facing the intake hose, and the PCV nipple on the manifold is literally facing the valve cover nipple, simple enough. It sounds like you had that part figured out though.

IF you aren't subject to emissions inspections, and IF you don't mind removing the CEL bulb: Just get rid of all the extra junk. The EGR can be easily removed and so can the EVAP system. That would leave you with only the necessary vacuum lines and a much cleaner engine bay. Big "IF"s though. And IF you plan on some serious modifications, it isn't worth trying to hook that stuff back up anyway. For example: The 60mm throttle bodies do no have the EVAP vacuum fitting.

Just for reference, here is a picture of that diagram that is supposed to be on your hood. Like I said, primitive but helpful. And just for fun, here's what my last setup looked like before tearing it all back apart for further modifications. That setup had next to nothing in terms of a vacuum system. Not even the stock valve cover or throttle body, much less a cruise control servo or vacuum reservoir . Wish I could be more helpful on that aspect but I think my explanation above hits everything you'd need to know.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

I really needed to get rid of the 3 way fitting and just install a pipe plug, but soon I won't be using the stock intake manifold so I had left it capped off.

You must be logged in to view this image or video.

Unlike the 420A, the 2.4L valve covers have the PCV nipple towards the front. Since those were reverse flow heads. So yea, not much helpful here for you.

 

[badgoose]

I'd love to take pictures, but my setup is too far from OE to be helpful in any way. The 420A DSM vacuum system is actually quite simple, though it looks like a tangled mess once someone screws with it. There was a diagram sticker on the under side of the hood from the factory, but it is primitive and yours may be missing.

So, let's break it down. On the backside of the upper intake manifold there is a 3 way fitting. The nipple nearest the driver side of the car should be plumbed directly to the EGR solenoid, just below the exhaust camshaft. The nipple nearest the passenger side of the car should be plumbed down towards the bottom of the firewall to a hardline, which would further run to the back of the vehicle. That's for the EVAP leak detection pump. Just look for whichever hardline has nothing connected or a free hanging hose and that's where it should go. The middle nipple should be plumbed down below the lower intake runners to a black vacuum reservoir. And if your car is equipped, there should be a line from the black vacuum reservoir over to the backside of the cruise control servo. Now, there is also one vacuum port on the throttle body. This should be plumbed across the backside of the intake manifold and connect to a hardline on the passenger side strut tower. It's for the EVAP purge solenoid, which is mounted behind the front bumper.

The rest should be almost self explanatory. The only other nipple on the backside of the manifold is for the brake booster, and the only other nipple on the frontside of the manifold is for the PCV valve. The fresh air intake nipple on the valve cover is literally facing the intake hose, and the PCV nipple on the manifold is literally facing the valve cover nipple, simple enough. It sounds like you had that part figured out though.

IF you aren't subject to emissions inspections, and IF you don't mind removing the CEL bulb: Just get rid of all the extra junk. The EGR can be easily removed and so can the EVAP system. That would leave you with only the necessary vacuum lines and a much cleaner engine bay. Big "IF"s though. And IF you plan on some serious modifications, it isn't worth trying to hook that stuff back up anyway. For example: The 60mm throttle bodies do no have the EVAP vacuum fitting.

Just for reference, here is a picture of that diagram that is supposed to be on your hood. Like I said, primitive but helpful. And just for fun, here's what my last setup looked like before tearing it all back apart for further modifications. That setup had next to nothing in terms of a vacuum system. Not even the stock valve cover or throttle body, much less a cruise control servo or vacuum reservoir . Wish I could be more helpful on that aspect but I think my explanation above hits everything you'd need to know.

You must be logged in to view this image or video.

You must be logged in to view this image or video.

I really needed to get rid of the 3 way fitting and just install a pipe plug, but soon I won't be using the stock intake manifold so I had left it capped off.

You must be logged in to view this image or video.

Unlike the 420A, the 2.4L valve covers have the PCV nipple towards the front. Since those were reverse flow heads. So yea, not much helpful here for you.

Thank youuuuuuu!! This is awesome I will upload pictures as soon a I get home, however it will be thunderstorming as well so I’m hoping. I will be cleaning up the garage to fit it in there. I will be taking the hood off and fiber glassing the vent holes to make it more water proof