How long should plugs/wires last?

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Northstar Engines and System Technical Discussion Discussion, How long should plugs/wires last? in Cadillac Engine Discussion; I have a 97 Seville SLS. Last spring, it was not running smooth. The ignition seemed to be missing. I ...
  1. #1
    sprj is offline Cadillac Owners Member
    Automobile(s): 1997 Seville SLS
    Join Date
    Mar 2005
    Detroit, MI

    How long should plugs/wires last?

    I have a 97 Seville SLS. Last spring, it was not running smooth. The ignition seemed to be missing. I put new AC Delco plugs and Bosch Platinum wires in about 12 months ago and it solved the problem. I just noticed today that my car seems to be repeating this same problem again?

    What is the consensus out there about how long these plugs and wires should last and which should I replace first? Would anyone recommend trying to clean the plugs if they appear to have normal wear ( I don't recall any abnormal deposits on the plugs I pulled last year. I have not pulled these yet to examine them)? Also, anybody know any tricks to make changing the plugs on this engine easier? I had a bear of a time with 'em last spring...



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  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
    Woodstock Ill.

    Re: How long should plugs/wires last?

    A/C Delco plugs and wires shoud last about 100K. Since you used Bosch, replace them and leave the plugs alone. You are not the first to find out the hard way that OEM is the way to go.

    Plugs are very easy. A little easier if you remove the strut tower cross brace and the coil pack, but not neccassary.

  4. #3
    Patrick7997's Avatar
    Patrick7997 is offline Cadillac Owners Enthusiast
    Automobile(s): 2004 Escalade, 07 Road King, 08 Challenger SRT8
    Join Date
    Oct 2005
    Pewaukee, Wisconsin

    Re: How long should plugs/wires last?

    Yeah, with the right length extension bar on your ratchet, those plugs are pretty easy....

    IF you wanna see a HARD one, take a look at a 4.9L Eldorado... those 4 in the back.... you will feel your will to live draining from your body....

    The strut tower brace needs to be removed. The coil pack does not. The wires can be pushed out of the way easily.

  5. #4
    davesdeville's Avatar
    davesdeville is offline Banned
    Automobile(s): 1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
    Join Date
    Aug 2003
    Albuquerque, NM

    Re: How long should plugs/wires last?

    I've never removed my strut tower brace when doing plugs. Somehow this FWD northstar is easier to do plugs on than my RWD Lincoln (almost everything else is harder though.)

  6. #5
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
    Automobile(s): 2000 Eldorado ESC
    Join Date
    Mar 2006
    Fort Lauderdale, Florida

    Re: How long should plugs/wires last?

    I agree with Ranger, it gives you a little more room with the strut brace out of the way, but you can change the plugs without removing it.

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