Plugs/Wires check! EGR check! Phenolic plates???
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
Northstar Engines and System Technical Discussion Discussion, Plugs/Wires check! EGR check! Phenolic plates??? in Cadillac Engine Technical Discussion; Ok, so far based on info I've gotten here (many thanks!) I've gotten two of three of these jobs completed. ...
  1. #1
    ktills45 is offline Cadillac Owners Fanatic
    Join Date
    Feb 2004
    Location
    North of Philly
    Posts
    493

    Plugs/Wires check! EGR check! Phenolic plates???

    Ok, so far based on info I've gotten here (many thanks!) I've gotten two of three of these jobs completed.

    However...

    On the 94 STS, the engine cover has four bolts which hold it down. Supposedly, taking these bolts off will remove the cover and allow access to the phenolic spacer plates for cleaning.

    My problem ( with apologies to spyder who's tried to help) is that on the air intake side there's a bracket attached which prevents the cover from fully disengaging from the engine. Attached to the bracket are a variety of parts which complicate the removal process.

    I would greatly appreciate anyone's help who has removed the cover to walk me through this procedure. Or, if it's not required to detach the intake side bracket, how else do you get at the plates?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
    Join Date
    Dec 2002
    Location
    Fort Lauderdale, Florida
    Age
    50
    Posts
    9,577

    Re: Plugs/Wires check! EGR check! Phenolic plates???

    You don't want to remove the silver top cover. The phenolic plates are not under the cover. They are under the intake manifold itself. The phenolic spacer plates separate the intake manifold from the cylinder heads. They act as an insulator and have the passages for the EGR and PCV feeds to the individual cylinders in them. Take the 4 inner bolts out and remove them. They are about 6 inches long. Lift the entire intake manifold up off the engine. If you leave everything attached to the intake (the air duct, etc) you can just tilt the intake manifold up on one end to access the phenolic spacer plates. The whole intake manifold, throttle body, bracket, etc. all lifts up a little. Tilt up the intake with the end behind the power steering pump the highest and just block it up with a block of wood to hold it while removing the plates on each side of the manifold....one phenolic plate between the manifold and the head on each side. Clean the plates out thoroughly and clean the intake ports at the mounting surface to clean out the little "mouse holes" or notches machined into the cylinder head material itself.

    To actually separate the silver top cover from the manifold and lift it up you have to take out the perimeter row of screws in the top cover...but you really don't want to do that for cleaning out the phenolic plates and it isn't necessary at all. Just take the 4 inner bolts out and the whole thing will lift up. There is no coolant or other fluids in the intake so there are no passages to worry about or gaskets to replace or liquids to spill.

  4. #3
    ktills45 is offline Cadillac Owners Fanatic
    Join Date
    Feb 2004
    Location
    North of Philly
    Posts
    493
    Thread Starter

    Re: Plugs/Wires check! EGR check! Phenolic plates???

    Ok.


    I've had the four bolts out, but it didn't seem that there was a ton of room to 'tilt' the manifold. That bracket on the air intake side seemed, at least the first go round, to be holding the manifold down tight.

    I'll give it another go this week. Once I found the EGR valve, that was an easy fix, so I'll take your word for it every time.

    BTW, no service engine light since the WOT runs and changing out the plugs/wires.

    This forum should sponsor your participation.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting