Few pics for you guys with Plenum issues - Page 2

submariner409 · #16 (**permalink**) 03-09-08, 09:45 PM

I think the plenum has a clamping plate on the TB end, not a simple spigot with hose clamp setup.

HOWEVER, an enterprising tuner could have a spigot welded to the (removed and cleaned....) plate, and make the necessary TB gasket......

**Ranger** · #17 (**permalink**) 03-09-08, 09:47 PM

So much for that idea.

mrgoodbar67 · #18 (**permalink**) 03-10-08, 04:18 PM

maybe i shouldnt ask but who is this mystery member you guys mention?
The General himself or what?

submariner409 · #19 (**permalink**) 03-10-08, 04:37 PM

Almost........I believe the person was heavily involved in the design, testing, and validation of Northstars and running changes. That's 55th party hearsay.........

**Ranger** · #20 (**permalink**) 03-10-08, 05:58 PM

I won't mention his screen name as he asked that we let it die a swift and silent death when he left (not that I think it matters anymore), but he is a GM powertrain engineer. He was a great asset and taught us a lot.

mrgoodbar67 · #21 (**permalink**) 03-10-08, 06:33 PM

damn!!!!!!!!!!!!!!!!!!
and hes GONE?
well...what are the odds of getting gm execs or close to it on the forum?
Maybe there are already some on here huh........

hay LUV...
what rims are those and what size.
it looks like your dev is just like mine..except i have mustards and mayos on and thinking about rims....
nice ride

**Ranger** · #22 (**permalink**) 03-10-08, 07:52 PM

They are the reason he is gone.

Quote:

Originally Posted by mrgoodbar67

damn!!!!!!!!!!!!!!!!!!
and hes GONE?
well...what are the odds of getting gm execs or close to it on the forum?
Maybe there are already some on here huh........

hay LUV...
what rims are those and what size.
it looks like your dev is just like mine..except i have mustards and mayos on and thinking about rims....
nice ride

jvegas08 · #23 (**permalink**) 03-25-08, 12:16 AM

wow, i love this site...i guess i just found my problem, hopefully...i changed my fpr and cleaned my manifold bout a month ago, left the car dead while i was on vaca, and am having check engine lights with same problem...will do the fix with posted pics and let you know how it goes...great post, THANKS!

Blown Z · #24 (**permalink**) 06-14-08, 12:27 PM

Thanks for the info, I plan on doing this today. For those needing the intake gaskets/seals, definitely go to NAPA. I paid about 17 bucks for all 8 seals as opposed to $7 for each seal from the dealer. It was a Fel-Pro set and the NAPA part number was MS93313.

Blown Z · #25 (**permalink**) 06-14-08, 09:26 PM

I've got the fuel rail off, how did you guys get the intake out? That sure is a tight fit!

submariner409 · #26 (**permalink**) 06-14-08, 10:49 PM

Lift the rail with all injectors. Pull the intake bolts and loosen the plenum clamp. Make sure the PCV vacuum hose is clear. Lift the intake about 40 degrees at the accessory drive end. Pull it out of the plenum.

Blown Z · #27 (**permalink**) 06-15-08, 12:59 AM

Thanks for the info sub, I got it all out and replaced the plenum. Once I put it all back together however it ran very rough when I started the engine. I plan on pulling the intake again and see where I might have messed up somewhere.

submariner409 · #28 (**permalink**) 06-15-08, 09:41 AM

Because you have to cock the manifold and slide it down and in to the plenum you might try to smear a thin coat of engine oil around the inside of the plenum clamping area. It's also possible you knocked one of the intake gaskets off center. They're reusable. Also, make sure the air intake piping from the air cleaner box past the MAF is properly installed. An air leak after the MAF really screws things up. There's also a PCV hose to check and check the overpressure relief valve in the end of the manifold.

Blown Z · #29 (**permalink**) 06-15-08, 11:27 AM

Thanks sub, I'll give all those a shot! The PCV hose is the hose that goes to the inner/center of the intake right? If that's not connected right could that cause the engine to run rough?

submariner409 · #30 (**permalink**) 06-15-08, 12:51 PM

Yes, that PCV hose is connected, at the cam cover, to either a rattle-type PCV valve or a specially sized nipple with bleed orifice. The overall air/fuel mixture is compensated for the bleed, so if the hose is disconnected you get a vacuum leak, same as if any of the rubber connectors are disconnected from the throttlebody or the valve(s) they control.