4.1 Spark Plug Wires Problem Solved (Maybe)
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 7 of 7
HT4100 4.1, 4.5, 4.9 Discussion, 4.1 Spark Plug Wires Problem Solved (Maybe) in Cadillac Engine Technical Discussion; My 87 Eldorado had been running rough so I did a full tune up (plugs , wires, cleaned throttle body ...
  1. #1
    PeteC is offline Cadillac Owners Member
    Automobile(s): 1987 Eldorado
    Join Date
    Jul 2004
    Location
    Hampton, VA
    Posts
    82

    4.1 Spark Plug Wires Problem Solved (Maybe)

    My 87 Eldorado had been running rough so I did a full tune up (plugs , wires, cleaned throttle body etc) over a year ago. It ran better for a while but started runnig bad again. Over the last year I had fixed several problems that made the car run better but still, over time, it would start running bad again. Several months ago I found that the spark plug wires were arcing, so I replaced them with a better quality set: AC Delco wires. The car ran much better, but then started to gradually run bad again. To my surprize the plug wires were arcing again.

    So I replaced them with 8.8mm Accel wires. The car runs better than it has for a long time, and the gas mileage is greatly improved (from 12 mpg to 17 mpg city driving).

    I am puzzled why the AC Delco wires broke down so soon. I thought they should be good quality, though a local mechanic said he thought Accel and Belden (NAPA) were a lot better. I asked him if there was something in the ignition system that would cause plug wires to break down so soon and he said no.

    So hopefully these Accel wires will last.

    Anyone else have a similar experience?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
    Location
    Southern Maryland
    Posts
    1,487

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    I have the Accel wires in my Jeep Cherokee and they work good there.

    I have the Belden wires in my 85 DeVille and it has a buzz, but I don't know if that's the wires.

  4. #3
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    I also had AC Delco wires that looked like brand new but were arking. I ended up replacing with my own custom made MSD 8.5mm wires. So far, no problems with arking.

  5. #4
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
    Join Date
    Jun 2005
    Location
    Michigan
    Posts
    668

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    Have always used Delco without issues. But, given how few people buy wire sets for this car, it may be possible that you bought a 10-year old wire set at the store.

  6. #5
    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
    5,832

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    Its extreemly important on this car to route the plug wires exactly like the factory does. All retainers and clips MUST be used or the wires will arc. If plug wires are routed too close to the distributor module wiring it will affect driveability.

  7. #6
    ehall's Avatar
    ehall is offline Cadillac Owners Connoisseur
    Automobile(s): 1985 Sedan DeVille
    Join Date
    Aug 2007
    Location
    Southern Maryland
    Posts
    1,487

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    I don't have any of the original retainers or clips... I've been looking on JC Whitney and some other sites for wiring stands and have not found much except some universal parts that probably won't fit.

  8. #7
    PeteC is offline Cadillac Owners Member
    Automobile(s): 1987 Eldorado
    Join Date
    Jul 2004
    Location
    Hampton, VA
    Posts
    82

    Re: 4.1 Spark Plug Wires Problem Solved (Maybe)

    Quote Originally Posted by carnut View Post
    Its extreemly important on this car to route the plug wires exactly like the factory does. All retainers and clips MUST be used or the wires will arc. If plug wires are routed too close to the distributor module wiring it will affect driveability.
    My clips have long ago disintigrated. The Accel kit had several wire spreaders, but it is not anything like the original setup. So far it seems to be working OK, but I will keep an eye on it to see if I start having arcing problems down the line.

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