Engine shutter on expressway
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 6 of 6
HT4100 4.1, 4.5, 4.9 Discussion, Engine shutter on expressway in Cadillac Engine Technical Discussion; I recently purchased a 89 deville and after 300 miles on the expressway at 70mph (with cruise on or off) ...
  1. #1
    alero is offline Cadillac Owners Member
    Join Date
    Oct 2003
    Location
    Michigan
    Posts
    5

    Engine shutter on expressway

    I recently purchased a 89 deville and after 300 miles on the expressway at 70mph (with cruise on or off) I started to notice a shutter or vibration when the car would start to go up an incline. It would only do it right at the start of the incline and would not act up again untill the start of another incline. At 55mph I did not notice the problem. Could this be a fuel problem? Does anything think I might need to replace the fuel filter....I am sure its the original and there is 128k miles on the car. Any other info would be appreciated.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,773
    educated guess would be a cracked spark plug insulator. ck for carbon tracks on the white portion of the plug. also another thought is arching spark plug wires. i think what you are feeling is a misfire under light load against the normal trans torque converter lock up. i strongly agree to replace the fuel filter based on age, not to cure the complaint. my experience with restricted fuel flow is bogging or lack of power reaching the top of a grade or at wide open throttle. a restricted fuel filter can over heat and damage an electric fuel pump. hope this helps, Bill.

  4. #3
    alero is offline Cadillac Owners Member
    Join Date
    Oct 2003
    Location
    Michigan
    Posts
    5
    Thanks for the info, I was planning on changing the plugs/wires/cap/roter soon because I have no idea when they were changed last and I doubt the dealer did it before they sold it. I also have a spare fuel filter laying around that was for my lesabre, and also fits the deville so im going to put that on for sure.

    I plan to use Bosch Platinum plugs/wires
    and order a AC Delco cap/roter from the dealer unless someone knows of a better replacement that is cheaper.

    Thanks again.

  5. #4
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,773
    based on personal experience i would use the delco dual patinum plugs for the 4.9 engine, not the bosch. cost virtually the same, delco will last longer. also some advice on plug wires. make sure they are routed exactly like from the factory, use all the seperators and retainers. the rear wires closest to the firewall tend to burn on the exhaust manifold! report back after on this thread.

  6. #5
    alero is offline Cadillac Owners Member
    Join Date
    Oct 2003
    Location
    Michigan
    Posts
    5
    My ride only has the 4.5L
    I already bought the Bosch plat. plugs a few weeks ago.

  7. #6
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    67
    Posts
    5,773
    I'm Aware Of Your Engine Being A 4.5, But The Upgraded Delco Plugs List For The 4.9 . This Might Be A Bit Of Superstion ? But If I Own A Gm Car I Use Gm Tune Up Parts, If Ford, Motorcraft. I Dont Want To Do The Job Twice Because I Experimented. This, Of Course Is My Personal Feeling.

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