Which spark plugs to buy?
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 16
Northstar Engines and System Technical Discussion Discussion, Which spark plugs to buy? in Cadillac Engine Technical Discussion; 93 Northstar Allante My service manuals calls for .045 gap spark plugs. I went to Rockauto and the following is ...
  1. #1
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Which spark plugs to buy?

    93 Northstar Allante
    My service manuals calls for .045 gap spark plugs. I went to Rockauto and the following is listed for my car. Which is the best spark plug?
    • ACDelco 41-936 Platinum Plug (.060 gap) – $5.99
    • NGK 7164 IX-Series Iridium (.060 gap) - $6.90
    • DENSO 5325 IT16 Iridium power (World’s smallest center electrode) - $8.01
    • NGK 7740 Premium Platinum - $8.14
    • NGK 3403 GP Series Platinum - $2.60

    Why are all the plugs recommended for my car set at .060 gap when the manual calls for .045? Should I use ACDelco 41-987 plugs used on newer Northstars which are gapped .050?

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    jcresciSTS is offline Cadillac Owners Enthusiast
    Automobile(s): 1999 Cadillac Seville STS (November 2012, 183k)
    Join Date
    Jul 2009
    Location
    South San Francisco, CA
    Age
    27
    Posts
    968

    Re: Which spark plugs to buy?

    do a search for "spark plug" on here...I'm sure the answer will be Delco

  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
    44,510

    Re: Which spark plugs to buy?

    Either go to a Cadillac parts desk and ask for the latest Service Bulletin info on your car or subscribe it to www.alldatadiy.com. Look up the tuneup specs. OR, the ol' standby: pop a beer and Google.

    Use the ACDelco Professional platinum plugs. IF you get a high rpm or heavy load miss close the gaps to .050", but be sure to use the proper gapping tool and DO NOT bend the center electrode or damage the platinum discs on the ground electrode.

  5. #4
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Re: Which spark plugs to buy?

    I was leaning on the DENSO 5325 IT16 Iridium power (World’s smallest center electrode) for longevity and the fact that newer GM cars are using it. If it's a waste of money, I'll go with ACDelco 41-936 or 41-987.

  6. #5
    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
    44,510

    Re: Which spark plugs to buy?

    For some reason - black magic - Northstars do not take kindly to plugs and electrodes other than the (original equipment) DENSO Platinum and the later Japanese-made ACDelco Professional Platinums. (Any guesses as to what company makes ACDelco Japanese plugs ???)

    There are some real nasty stories in here concerning the Bosch 2 - 3 - and 4 electrode plugs. A few more about NGK.

    Nobody complains about the ACD's, so why push your luck ?? Longevity ??? Isn't 100,000 miles enough as recommended for the original plugs ???

    BUT, I use only NGK Iridium plugs in my Olds 455 marine engines. Not a problem. Northstars hate 'em. Go figure.

  7. #6
    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
    73,267

    Re: Which spark plugs to buy?

    I'd go with the Delco as well.

  8. #7
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
    Automobile(s): 93 & 88 Allante, 88 Eldorado
    Join Date
    Jan 2004
    Posts
    779

    Re: Which spark plugs to buy?

    I'll probably go with the ACDelco's but did come across a member on this board who had success with Denso Iridium's. That said, I do plan to drive the car at least another 300k miles.
    ************************************************** *****************************

    ghutchin
    Cadillac Owners Member
    Join Date: Apr 2004
    Casino Cash: $1020
    iTrader: (0)


    Re: Rough running 95 SLS
    ________________________________________
    I can say that the Delco wires hold up much longer than other brands. I had a set of Bosch wires in my car that started missing after about 40k. The AC's regularly go to 90k+.

    I'm currently running Denso Iridium plugs. Those seem to be good.

    I think in the end its a longevity thing, with the Delco products being designed to GM's spec of lasting 100k miles. In reality, I think this equates to them being of higher quality.

  9. #8
    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
    44,510

    Re: Which spark plugs to buy?

    With modern plug technology, unleaded fuels and today's fuel additives just about any spark plug will go 75,000+. It ain't like the 60's when a set of plugs was complete toast at 5,000 to 8,000 miles.

  10. #9
    2004DTS's Avatar
    2004DTS is offline Cadillac Owners Member
    Automobile(s): 2004 Deville DTS
    Join Date
    Jul 2009
    Location
    Fayetteville, NC
    Age
    29
    Posts
    13

    Re: Which spark plugs to buy?

    Has anyone had any experience with Pulstar Plugs at all? I understand that most recommend AC Delco due to familiarity but I'm asking if anyone has had experience with Pulstar spark plugs or knows anyone who has. I just bought a 2004 DTS and plan on getting it tuned up within the next couple weeks and plan on replacing them. I might even try to do it myself, I hear its pretty easy with the N*

    Thanks in advance for any input

  11. #10
    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
    44,510

    Re: Which spark plugs to buy?

    There's another post of yours similar to this in another thread, and there's an answer about the Pulstar plugs.

    No one in here uses the ACDelco plugs due to or because of familiarity. This set of forums is full of spark plug stories over the last 6 years and the bottom line is that the ACDelco professional Platinum plugs in the recommended heat range are the best plugs for your engine. We've all tried various magic plugs and snake oils and the general consensus is that they either don't work, cause nagging misses and poor engine operation, or give you nothing in the way of improvement or bang for the buck. The Ac's will go to 100,000 or more.

    The overall plug change is not as easy as it looks.................Do it with the engine COLD and check the boots for tracking and the coil cassettes for proper ground spring clean contact. Don't worry about a tad of oil in a plug well or two - the wells are sealed with O-rings and may tent to weep a bit. Normal.

  12. #11
    mikelawson is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac
    Join Date
    Apr 2008
    Posts
    123

    Re: Which spark plugs to buy?

    Due to cost and personal experiences, I use Bosch platinum plus in my Northstar rebuilds. I give my customers the option of paying 7+ a plug or 3+ a plug and most use Bosch. I would estimate 25 or so have chosen Bosch and NONE have experienced any issues. Submariner is right on, just about any plug will last a very long time.

  13. #12
    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
    73,267

    Re: Which spark plugs to buy?

    Quote Originally Posted by mikelawson View Post
    Due to cost and personal experiences, I use Bosch platinum plus in my Northstar rebuilds. I give my customers the option of paying 7+ a plug or 3+ a plug and most use Bosch. I would estimate 25 or so have chosen Bosch and NONE have experienced any issues. Submariner is right on, just about any plug will last a very long time.
    WOW! First time I've heard that.

  14. #13
    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
    44,510

    Re: Which spark plugs to buy?

    Having experience with Robert Bosch plugs in other vehicles and a couple of boat engine installs, I would not use a Bosch plug in even my Briggs&Stratton lawnmower. Porsches love 'em, however.

    Even though the recommended ACDelco plugs for my engine are about $4 apiece more expensive than the platinum Bosch, that insignificant cost is immaterial in the scheme of an engine rebuild.

    Which begs the tongue-in-cheek question: If you're buying the Bosch plugs for $1.86 each, what are you selling them to the customer for ??

  15. #14
    joe_mn is offline Cadillac Owners Member
    Join Date
    Dec 2003
    Posts
    16

    Re: Which spark plugs to buy?

    saving $25 on a $3k or more engine rebuild is money well spent? thats like throwing a deck chair off the titanic.

  16. #15
    mythy is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado 98
    Join Date
    Oct 2008
    Age
    29
    Posts
    264

    Re: Which spark plugs to buy?

    I didnt listen I went with NGK some thing the ones with the fine tip plats. Ever since then it just seams off... a worse suge at idle then what I started with and I swear I could be wrong but weaker acceleration..

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