2005 Deville ignition coil
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2005 Deville ignition coil in Past Cadillac Vehicle Discussion; here is a two part question: Should I replace just the weak coils or replace them all? Also, the aftermarket ...
  1. #1
    glenpointe is offline Cadillac Owners Member
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    2005 Deville ignition coil

    here is a two part question:
    Should I replace just the weak coils or replace them all? Also, the aftermarket coils are 50% less than Delphi coils. Should I go with the aftermarket? About $125 in savings for 8 coils.

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    Ranger's Avatar
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    Re: 2005 Deville ignition coil

    I'd only replace the ones that failed.
    Northstars don't seem to like anything but OEM plugs. I've never heard anything like that about coils, but I'd stay away from Autozone.

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    GrandpaKen is offline Cadillac Owners Member
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    Re: 2005 Deville ignition coil

    I had a miss on cylinder 1 and opted to replace both banks with Delphi from Amazon for about $120 each. I also didn't know if the plugs were ever changed so I swapped those out too. Total was $300 and the car should be good for another 120k miles. Total time was about 1 1/2 hours for the back and 20 minutes for the front. If the miss was on the front I might have just replaced the one coil but with the work required to get at the back bank I decided it wasn't worth it to just replace the bad one.

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    Quote Originally Posted by GrandpaKen View Post
    I had a miss on cylinder 1 and opted to replace both banks with Delphi from Amazon for about $120 each. I also didn't know if the plugs were ever changed so I swapped those out too. Total was $300 and the car should be good for another 120k miles. Total time was about 1 1/2 hours for the back and 20 minutes for the front. If the miss was on the front I might have just replaced the one coil but with the work required to get at the back bank I decided it wasn't worth it to just replace the bad one.
    I’m pretty sure the 2005 doesn’t use cassettes, but has individual coils.

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    Re: 2005 Deville ignition coil

    The cassette was used from 2000-2003.

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    PFMDTS is offline Cadillac Owners Member
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    Re: 2005 Deville ignition coil

    I took a slightly different approach. I replaced all the spark plugs with OEM and changed the rear bank coils saving them as spares.
    I used the Delphi set purchased from Rock Auto. I had around 97K on my DTS and the plugs while burning well did need to be changed.

  8. #7
    jmf1964 is online now Cadillac Owners Fanatic
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    Re: 2005 Deville ignition coil

    Quote Originally Posted by GrandpaKen View Post
    I had a miss on cylinder 1 and opted to replace both banks with Delphi from Amazon for about $120 each. I also didn't know if the plugs were ever changed so I swapped those out too. Total was $300 and the car should be good for another 120k miles. Total time was about 1 1/2 hours for the back and 20 minutes for the front. If the miss was on the front I might have just replaced the one coil but with the work required to get at the back bank I decided it wasn't worth it to just replace the bad one.
    Same here, I got the coils, Delphi, 2 banks of 4 with wire harnesses and brackets, from amazon for $114 each. But the skip in my motor was caused by a bad head gasket and did not go away, but the coils went on the new motor so it wasn't a complete waste.

    Also, be careful taking the old coils out. on mine 3 of them all in the back, the rubber insulator was left behind on the plug, a real pita to get out without the right tool.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2005 Deville ignition coil

    Quote Originally Posted by jmf1964 View Post
    Also, be careful taking the old coils out. on mine 3 of them all in the back, the rubber insulator was left behind on the plug, a real pita to get out without the right tool.
    That statement is support for using silicone dielectric ignition grease in the new coil tip boots. Dirt cheap at any parts store.
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    Caddy-EaRL's Avatar
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    Quote Originally Posted by Submariner409 View Post
    Quote Originally Posted by jmf1964 View Post
    Also, be careful taking the old coils out. on mine 3 of them all in the back, the rubber insulator was left behind on the plug, a real pita to get out without the right tool.
    That statement is support for using silicone dielectric ignition grease in the new coil tip boots. Dirt cheap at any parts store.
    It’s more likely that the so called “normal” oil seepage swelled the rubber. I’ve seen this to many times to count, not just on northstars. Which is why I always tell people when changing plugs and they see oil, that’s it’s not “normal” and the tube seals need to be changed. While so many others here tell people that the oil in the tube seal is “normal”, not to worry about it.

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    Re: 2005 Deville ignition coil

    Maybe common is a better choice of words than "normal".

  12. #11
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    Re: 2005 Deville ignition coil

    ........ and in most cases the small amount of oil in the plug well(s) accumulated over more than 100,000 miles and a lot of years. Maybe not "normal", but not uncommon.

    Because changing the spark plugs in a Northstar is such a bitch, few people regularly pull a plug or two to read them. Changing the spark plug well seals in the cam covers is also one hell of a tedious job.

    See those 8 O-rings? Plug well seals.
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