Factory air intake question
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 10 of 10
Like Tree3Likes
  • 4 Post By Submariner409
  • 2 Post By weister42
Northstar Engines and System Technical Discussion Discussion, Factory air intake question in Cadillac Engine Technical Discussion; I have a 98 Deville... the computer that's in the bottom intake chamber below the air filter box is the ...
  1. #1
    weister42 is offline Cadillac Owners Enthusiast
    Automobile(s): 1998 Cadillac Deville Sedan
    Join Date
    Feb 2005
    Posts
    897

    Factory air intake question

    I have a 98 Deville... the computer that's in the bottom intake chamber below the air filter box is the PCM or is it something else? Is it also a thermal electronic device that actually cools down the surrounding air or is it just a big slab of aluminum?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,861

    Re: Factory air intake question

    Yes, that's the PCM. It does not cool the surrounding air, IT is cooled by the intake air flow over it.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,007

    Re: Factory air intake question

    It's a big, useless slab of carefully designed aluminum used for airflow control. Don't even read the ID sticker, cut off the 100 or so wires, tape them up and pitch it. The drivetrain will love you. You will gain 126 hp and the airbox will flow twice as much air as a K&N filter modified with 10W-50 magic oil.

    Also, see Post #2.

  5. #4
    CadillacLuke24's Avatar
    CadillacLuke24 is offline Cadillac Owners Connoisseur
    Automobile(s): Alexandra - 96 SDV
    Join Date
    Jul 2010
    Location
    Middle of Nowhere
    Age
    23
    Posts
    4,856

    Re: Factory air intake question

    ^^^

  6. #5
    weister42 is offline Cadillac Owners Enthusiast
    Automobile(s): 1998 Cadillac Deville Sedan
    Join Date
    Feb 2005
    Posts
    897

    Re: Factory air intake question

    Quote Originally Posted by submariner409 View Post
    It's a big, useless slab of carefully designed aluminum used for airflow control. Don't even read the ID sticker, cut off the 100 or so wires, tape them up and pitch it. The drivetrain will love you. You will gain 126 hp and the airbox will flow twice as much air as a K&N filter modified with 10W-50 magic oil.

    Also, see Post #2.
    Hell yeah and I'll get some K&N and NOS stickers, they add torque at 2000 and 5000 rpm!




    Haha no I asked this because I didn't know what that thing is and why is it in an air intake. So if the PCM is not in the intake it'll overheat unless there's a good-sized fan blowing at it then?

  7. #6
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,007

    Re: Factory air intake question

    Quote Originally Posted by weister42 View Post
    Haha no I asked this because I didn't know what that thing is and why is it in an air intake. So if the PCM is not in the intake it'll overheat unless there's a good-sized fan blowing at it then?
    Maybe, maybe not - but the IAT flowing through the intake airbox is usually a lot lower than the ambient air in the engine compartment, especially at highway speeds. After several years of watching IAT with a ScanGauge, (both in the truck and car) at highway speeds the IAT runs about 6 - 10 degrees above outside ambient; in suburban driving (lower airflow into the engine) gets to 10 - 25 degrees above ambient, and slow stop and go city driving allows the IAT to go as high as 155 because there's very little airflow into the engine and the ducting itself heats up as engine compartment temperature increases. Get moving again and the IAT drops slowly as the intake ducting cools.

    So.......There are times when the PCM sees temps over 150...........I have no idea what temp limits Siemens built the PCM's to tolerate, but they can take some heat.

  8. #7
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 12 Sierra, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    23
    Posts
    3,187

    Re: Factory air intake question

    But definitely not a wise idea to get rid of the ducting for PCM.

  9. #8
    weister42 is offline Cadillac Owners Enthusiast
    Automobile(s): 1998 Cadillac Deville Sedan
    Join Date
    Feb 2005
    Posts
    897

    Re: Factory air intake question

    So this also means that if the intake sucked up water then the PCM will fry before water gets into the engine right? I remember I took a picture of the PCM a few years ago... ahh found it





    As you can see there is a removable computer chip in there under a pretty hefty sealed aluminum cover. Maybe this is how they go from vin Y to vin 9 and vice versa without having to redesign a new circuit board?

  10. #9
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 12 Sierra, 00 SLS, 99 Deville 50-year Anniversary
    Join Date
    Mar 2009
    Location
    Dallas, TX
    Age
    23
    Posts
    3,187

    Re: Factory air intake question

    The PCM is sealed pretty well.

  11. #10
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,861

    Re: Factory air intake question

    The only way the intake will suck up water is if you drive through 2-3 feet of water.

    ----------

    Quote Originally Posted by weister42 View Post
    As you can see there is a removable computer chip in there under a pretty hefty sealed aluminum cover. Maybe this is how they go from vin Y to vin 9 and vice versa without having to redesign a new circuit board?
    No, but what that is escapes me at the moment. Maybe someone else will remember.

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