Post 2000 N*?
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
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 18
Northstar Engines and System Technical Discussion Discussion, Post 2000 N*? in Cadillac Engine Technical Discussion; Hey All, I have heard that GM made alot of changes to the post 2000 N*'s. Anyone know the specifics ...
  1. #1
    bharner's Avatar
    bharner is offline Cadillac Owners Fanatic
    Join Date
    Dec 2003
    Location
    VA
    Age
    34
    Posts
    238

    Post 2000 N*?

    Hey All,

    I have heard that GM made alot of changes to the post 2000 N*'s. Anyone know the specifics to that?

    Thanks

  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
    74,784

    Re: Post 2000 N*?

    They lowered the compression ratio just a tad to allow for regular gas. They replaced the flat tappet lifters with roller finger followers which extends the oil change intervals to a max of 12,500 under ideal conditions. They also did away with the plug wires by going to COP (Coil On Plug) ignition. There may be more, but that is all I can think of.

  4. #3
    Blown Z's Avatar
    Blown Z is offline Cadillac Owners Fanatic
    Join Date
    Mar 2006
    Location
    IL
    Posts
    107

    Re: Post 2000 N*?

    Is it 2000 and up Northstars that had these changes? I've read in some other places that it was 2001 or 2002 and up.

  5. #4
    codewize's Avatar
    codewize is offline Cadillac Owners Master
    Automobile(s): 1991 Brougham d'Elegance / 2001 DTS / 2002 DTS
    Join Date
    Apr 2005
    Location
    Upstate NY
    Posts
    6,681

    Re: Post 2000 N*?

    No it is 2000 and up. I don't know the specifics if these but they also addressed the oil usage issue and coolant leaks that were notorious on the earlier N*.

  6. #5
    Eric is offline Cadillac Owners Fanatic
    Automobile(s): 2000 SLS
    Join Date
    Aug 2003
    Location
    SoCalif
    Posts
    292

    Re: Post 2000 N*?


  7. #6
    Yaemish is offline Cadillac Owners Connoisseur
    Automobile(s): 02 Seville, 04 SRX
    Join Date
    Sep 2003
    Location
    NY
    Posts
    1,096

    Re: Post 2000 N*?

    Does the head gasket problem still exist in the newer engines?

  8. #7
    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
    74,784

    Re: Post 2000 N*?

    Quote Originally Posted by Yaemish
    Does the head gasket problem still exist in the newer engines?
    I think in 2000 or there abouts, they made some changes to the head bolts to reduce the possibility.

  9. #8
    JimD is offline Cadillac Owners Connoisseur
    Automobile(s): '98 STS (RIP @ 206,xxx miles)
    Join Date
    Sep 2003
    Location
    Atlanta area
    Posts
    4,835

    Re: Post 2000 N*?

    Quote Originally Posted by Yaemish
    Does the head gasket problem still exist in the newer engines?
    We could all benefit by a tiny terminology change here. Some very high percentage of head gasket failures can be traced back to an owner's failure to follow the recommended coolant maintenance schedule.

    Maybe the head gasket situation could be more accurately described as the "owner did not read the manual" problem?

  10. #9
    codewize's Avatar
    codewize is offline Cadillac Owners Master
    Automobile(s): 1991 Brougham d'Elegance / 2001 DTS / 2002 DTS
    Join Date
    Apr 2005
    Location
    Upstate NY
    Posts
    6,681

    Re: Post 2000 N*?

    I concur

    Quote Originally Posted by JimD
    We could all benefit by a tiny terminology change here. Some very high percentage of head gasket failures can be traced back to an owner's failure to follow the recommended coolant maintenance schedule.

    Maybe the head gasket situation could be more accurately described as the "owner did not read the manual" problem?

  11. #10
    El Dobro's Avatar
    El Dobro is offline Cadillac Owners Connoisseur
    Join Date
    Sep 2003
    Posts
    1,471

    Re: Post 2000 N*?

    Maybe the head gasket situation could be more accurately described as the "owner did not read the manual" problem?[/QUOTE]
    And what problem would that be?

  12. #11
    codewize's Avatar
    codewize is offline Cadillac Owners Master
    Automobile(s): 1991 Brougham d'Elegance / 2001 DTS / 2002 DTS
    Join Date
    Apr 2005
    Location
    Upstate NY
    Posts
    6,681

    Re: Post 2000 N*?

    Apparently there is a high rate of head gasket failure on the Northstars. In addition this failure is primarily due to lack of maintenance to the coolant system as specified in the owners manual.

    I don't really understand why older coolant would affect a head gasket but it does. And the coolant maintenance IS in the owners manual.


    Quote Originally Posted by El Dobro
    Maybe the head gasket situation could be more accurately described as the "owner did not read the manual" problem?
    And what problem would that be?

  13. #12
    bharner's Avatar
    bharner is offline Cadillac Owners Fanatic
    Join Date
    Dec 2003
    Location
    VA
    Age
    34
    Posts
    238
    Thread Starter

    Re: Post 2000 N*?

    sorry ive been out of it. thanks for the info gents

  14. #13
    El Dobro's Avatar
    El Dobro is offline Cadillac Owners Connoisseur
    Join Date
    Sep 2003
    Posts
    1,471

    Re: Post 2000 N*?

    Quote Originally Posted by codewize
    Apparently there is a high rate of head gasket failure on the Northstars. In addition this failure is primarily due to lack of maintenance to the coolant system as specified in the owners manual.

    I don't really understand why older coolant would affect a head gasket but it does. And the coolant maintenance IS in the owners manual.
    Finally convinced the dealer to change mine at 4 years and 55,000 miles. A lot of Northstars had to have the gaskets changed at even less, so how would that be due to lack of maintenence?

  15. #14
    blb
    blb is offline Cadillac Owners Fanatic
    Join Date
    Jul 2004
    Posts
    173

    Re: Post 2000 N*?

    Quote Originally Posted by Yaemish
    Does the head gasket problem still exist in the newer engines?
    The thread pitch on the headbolts was changed to a more coarse thread in 2000, and this was supposed to address the premature headgasket failure prevalent in prior Northstars, but according to my contact at the dealer, they still see quite a few 2000 and newer models that have headgasket issues. In April, they had a black '02 STS in with 93,000 miles where the back bank headgasket was breached causing coolant to enter the exhaust.

  16. #15
    codewize's Avatar
    codewize is offline Cadillac Owners Master
    Automobile(s): 1991 Brougham d'Elegance / 2001 DTS / 2002 DTS
    Join Date
    Apr 2005
    Location
    Upstate NY
    Posts
    6,681

    Re: Post 2000 N*?

    So is lack of coolant maintenance the cause or the catalyst? Or is this just a problem?

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