G-Northstar Intake Plug
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Northstar Engines and System Technical Discussion Discussion, G-Northstar Intake Plug in Cadillac Engine Technical Discussion; I found a nice little plug for the intake tube that allows the removal of the intake silencer or resonator ...
  1. #1
    jadcock's Avatar
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    G-Northstar Intake Plug

    I found a nice little plug for the intake tube that allows the removal of the intake silencer or resonator or whatever it's called. No performance characteristics are expected to change, I just wanted to clean up the engine bay and make transmission fluid and air filter inspections much easier. I guess all the G-platform Northstar cars have this setup? (98+ Seville and 00+ DeVille)

    It's a rubber "quick connect" product designed for connecting lengths of PVC piping (rather than using PVC unions or elbows). But they also had plugs, or caps. The Quick Cap for 2" PVC pipe fit VERY snugly in the intake tube hole...almost like it was designed for it. Tightly enough for it to never fall out, but it's not so crammed in there so as to cause a deformation in the cap or intake tube and create an air leak. It's really a perfect size.

    Found it at Home Depot. It was a buck and a half or something.


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    danbuc's Avatar
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    Re: G-Northstar Intake Plug

    That's exactly what I used....bought if from Home Depot. Except I flipped it the other way around, so that the bottom was almost flush with the inside of the tube. That way, you don't have air rushing pass a large opening, since it's sits almost flush inside. Just a thought. Also, you might want to use some glue as well. I tried just using a metal band clamp, and one night on my way to pick some food up at the Outback, the plug came loose and logged itself flat up against the maf screen bogging the engine down until it stalled. Kinda threw me for a loop at first since I had no idea what happened, then I looked at the intake tube and saw the hole. At that point, I got some high strength RTV and lined the outside of the plug before I set it back in place. Hasn't moved since.

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    clarkz71's Avatar
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    Re: G-Northstar Intake Plug

    Nice.

  5. #4
    Ekindler0584 is offline Cadillac Owners Member
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    Re: G-Northstar Intake Plug

    I made mine originally out of two circles of pvc cut at different sizes. It felt real secure... But one night as I was getting on the freeway, manually shifting, and really getting on the gas... And it popped out!

    Needless to say, the engine started bogging down, and I had to pull over to find the cap and put it back on. Since then, I have added an extra piece of pvc, so that it is three layered circles, with the middle one a quater inch thick and a quarter inch smaller than the two outside pieces... With a thin strap around it all to keep it from popping out...

    So make sure yours is secured! (That is, if you always drive your caddy like you stole it!)

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    Re: G-Northstar Intake Plug

    Thanks guys for the comments.

    Good comments about it becoming unsecured. That's actually why I installed it how I did...the "top" of the plug has much more deformity resistance than the "bottom" (hollow) end...simply because the top is where the flat of the cap is. I think the only way it could fall out is if it popped OUT, rather than getting sucked IN. But some rubber glue/RTV couldn't hurt. And if I do that, I might as well flip it to create the smoothest surface possible, as you suggested, Danbuc.

    Edit: and I really don't want this getting sucked in. On the 2000+ engine, this is BEHIND the MAF, so if it did get sucked in, it'd lodge itself against the throttle butterfly, possibly blocking it open (dangerous). After thinking about this for about .3 seconds, I WILL go ahead and use some CA.

  7. #6
    codewize's Avatar
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    Re: G-Northstar Intake Plug

    I'm scratching my head. What the heck are we talking about here. First of all what is a G platform Northstar? Secondly my car doesn't have ANYTHING that looks like that. My trans dipstick is wide open. No problem accessing it at all and my air filter box is totally exposed. No problems whipping off the couple of wing-nuts for inspection. Of course I did have the Volant box on there which made even more room but I'm talking about with the factory air box.

    Is that a Seville? because my overflow tank isn't even on that side of the car.
    Ownership:
    91 d'Elegance 350
    02 DTS
    01 DTS:
    Custom installed Volant CAI
    Custom PCM
    Body color engine components
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    Eibach springs
    Corsa exhaust
    Sportwing Spoiler
    Semi-custom interior
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    Future Plans: More interior work.


    Memberships:
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    ----------------------------

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    Re: G-Northstar Intake Plug

    So the engine compartment on your '01 DTS looks totally different from that? I thought all G-platform Northstar cars (meaning 98-04 Seville and 00-05 DeVille) looked like that under the hood.

    The Seville (beginning in '98) has a large resonator/silencer box that "plugged in" to the intake tube where my plug is. It as a loose slip-fit at best, and I didn't like the potential for dirty air getting in there anyway. And I did CA the plug to the tube, so it has an AIR TIGHT seal now (and won't come out).

    If you could provide a pic of the underhood of your '01 DeVille, I'd love to see it. That would be my mistake if it's completely different. You learn something everyday, even if you think you already knew it.

    Edit:

    G-platform is the structure which began with the '95 Aurora and Riviera and which underpins the 98-04 Seville and 00-05 DeVille. This is a short article about it: http://en.wikipedia.org/wiki/GM_G_platform_%28FWD%29

    This following Wikipedia article claims that the recent FWD Cadillac models were still technically K-platform cars, though does admit that it's based on the G-platform: http://en.wikipedia.org/wiki/GM_K_platform_%28FWD%29

    The 1998 Seville is generally referred to as being on the G-platform, with the DeVille joining it in 2000. If that Wikipedia article is correct, and I guess that it probably is, the Cadillac platforms are still officially called "K"...although they share all the signature trademarks of the G-platform, like the battery under the rear seat. The 98-04 Seville also has the coolant surge tank in front of the driver side strut, just like in the Aurora. Since the Seville shared that design, I figured the DeVille would also, but I must be incorrect. Prior to 1998, the Seville's pressure surge tank was in front of the passenger side strut -- is that where it is on your '01 DeVille?

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    Re: G-Northstar Intake Plug

    Nope, my layout is totally different. I would love to provide pics but I think I deleted the ones I had so we'll have to wait until tomorrow when I get the car back from the tranny guy.
    Ownership:
    91 d'Elegance 350
    02 DTS
    01 DTS:
    Custom installed Volant CAI
    Custom PCM
    Body color engine components
    Cruiser Alloy wheels
    EBC brakes and rotors
    Eibach springs
    Corsa exhaust
    Sportwing Spoiler
    Semi-custom interior
    Custom quad Hi-Beams
    Future Plans: More interior work.


    Memberships:
    National and regional Cadillac & LaSalle Club
    Proud Volunteer - Northstar Tuning Project
    Guinness World Records - Largest Cadillac Parade

    ----------------------------

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    OffThaHorseCEO is offline Cadillac Owners Connoisseur
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    Re: G-Northstar Intake Plug

    here it is
    Attached Images

  11. #10
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    Re: G-Northstar Intake Plug

    Late 2002 (02-02) STS, Magneride, strut bar, CORSA, some tricks. Resonator in question is kidney-shaped box over driver's side transmission area. PITA for air filter changes/cleanups. Thanks for the butt plug tip...........Jim

  12. #11
    dwight.j.carter's Avatar
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    Re: G-Northstar Intake Plug

    Guys I hate to tell you this but that little add on plastic box is to help in cooling the air before it gets to the motor. I won't be taking mine off anytime soon. I would like to find a cold air intake for mine though made of rubber or plastic as the metal ones on ebay get to hot and don't work right.

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    Re: G-Northstar Intake Plug

    Dwight......Think about what you just said about a sealed resonator box cooling air. Maybe theoretically, by damping intake pulses, but the route to the intake valve is already damped by the MAF, throttlebody butterfly, and the standing wave pulses in the tuned intake runners.

  14. #13
    codewize's Avatar
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    Re: G-Northstar Intake Plug

    Yup, that's it al right. Thanks
    Quote Originally Posted by OffThaHorseCEO View Post
    here it is
    Ownership:
    91 d'Elegance 350
    02 DTS
    01 DTS:
    Custom installed Volant CAI
    Custom PCM
    Body color engine components
    Cruiser Alloy wheels
    EBC brakes and rotors
    Eibach springs
    Corsa exhaust
    Sportwing Spoiler
    Semi-custom interior
    Custom quad Hi-Beams
    Future Plans: More interior work.


    Memberships:
    National and regional Cadillac & LaSalle Club
    Proud Volunteer - Northstar Tuning Project
    Guinness World Records - Largest Cadillac Parade

    ----------------------------

  15. #14
    danbuc's Avatar
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    Re: G-Northstar Intake Plug

    Quote Originally Posted by dwight.j.carter View Post
    Guys I hate to tell you this but that little add on plastic box is to help in cooling the air before it gets to the motor. I won't be taking mine off anytime soon. I would like to find a cold air intake for mine though made of rubber or plastic as the metal ones on ebay get to hot and don't work right.

    Haha..WRONG!

    It's a resonance chamber tuned to reduce induction noise in the intake system under heavy load.


    You are correct that a cai made out of metal that's placed in the engine bay is counter-productive. The best material to use would likely be white pvc piping. It's a light colored plastic, and therefor will not transfer heat very well...which is perfect.

  16. #15
    danbuc's Avatar
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    Re: G-Northstar Intake Plug

    dwight.j.carter, I didn't mean to sounds like a complete douchebag in my response by the way. Long day, got written up at work, and have a generally sh**ty ass week. Sorry to come at you like that....just in case you happen to read it the wrong way.

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