Got a couple questions to ask... 1995 Deville tune-up and gasoline
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Got a couple questions to ask... 1995 Deville tune-up and gasoline in Past Cadillac Vehicle Discussion; I've got two buddies that are both automotive technitians and work on various brands. I have been meaning to change ...
  1. #1
    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Got a couple questions to ask... 1995 Deville tune-up and gasoline

    I've got two buddies that are both automotive technitians and work on various brands. I have been meaning to change my wires and plugs so I know for sure when they were replaced, the wires are Packard brand and I am told they are the OEM brand used in my Deville. Tech A says these could very well be the original plug wires; Tech B says there is no way the original wires would have lasted this long by time nor mileage (144,000). If the wires have been replaced before an excellent job was done on the routing because all plastic clips and sheilds look untouched!
    So does anyone think the original wires could have lasted all this time/mileage?

    Another thing to note is that the Deville had Bosch platinum spark plugs in so I know those have been replaced before, I just replaced those with AC Delco double platinum #41-902.

    Also Tech B says that I may be wasting money by using premium fuel in a vehicle that has so many miles as the compression ratio is lower now. I'll admit I have used regular fuel in the Deville recently and have not noticed any negative results. Does anyone think I am setting myself up for problems in the future though? TIA! 4.9 liter engine.

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  3. #2
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The original plug wires were AC Delco.

    The 4.9 was designed to run on 91 octane. Mileage has absolutely no effect on an engines octane requirement. That said, some members do get away with running 89 and 87 octane. It depends on driving style, atmospheric conditions, and the mechanical state of the engine. Keep in mind that the 4.X engines do not have a knock detection system. If knock does occur, the car will do nothing to stop it.

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    STS_Seville_Hunter is offline Cadillac Owners Enthusiast
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    Packatd are the original wires... My Eldo had originals at 163k and a buddys had originals at 179k!

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    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: Got a couple questions to ask...

    Delco replacements are Packard. The originals also say Packard, but are accompanied by numbers, relating them to the cylinder they serve... If your wires also have the numbers on them, they are 1995 original.

  6. #5
    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Re: Got a couple questions to ask...

    Thank you for your responses! The wires are indeed numbered so they were never replaced before. I just finished installing new AC Delco wires, that plastic heat sheilding around the original wires just dicenergrated in my hands! I was able to reuse most of the retaining clips however!
    It's great to see the original wires can last so long, all 8 wires came off complete and intact!

  7. #6
    bigm57ict's Avatar
    bigm57ict is offline Cadillac Owners Connoisseur
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    Re: Got a couple questions to ask...

    192,000 miles on my Sedan Deville and I'm pretty sure the wires are original. They do have the numbers on them.

    Yeah, I know, they're due for replacement. But I haven't really had any issues yet and there are other, more pressing matters.

  8. #7
    Submariner409's Avatar
    Submariner409 is online now If it won't run, slap in a big stereo
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    Re: Got a couple questions to ask...

    Heh, heh ............ Do some Google work to find out how Albert Champion and Dayton Engineering Laboratories COmpany morphed into AC Delco-Remy Packard and so on and on. DELPHI has an interesting GM lineage, too................. Champion spark plug and aftermarket oil filter supplier is in there, too.

    As drewsdeville posted, Packard is/was a division of GM/AC Delco. Packard 440 copper stranded ignition wire was the darling of hot rodders in the 40's and 50's. Nowadays it would make your radio sound like a chain saw. (Remember - in the 50's a radio (AM only) was an option - as was a heater ! )

    ............ and what was that little triangle at 640 on the AM radio dial ?????

    This link is only the tip of the iceberg ........... http://en.wikipedia.org/wiki/ACDelco

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    My Deville went 195k miles on the original Packard plug wires. I ran Bosch Platinums and regular gas too and it was the best running car I ever had. It would have went a lot farther but got wrecked by a drunk. I didn't dare to replace those nice wires with cheap replacements. I haven't seen any new ACDelco wires in a while so I don't know if they are still the same quality they used to be but probably the best you can get besides MSD.

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    Submariner409's Avatar
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    Take a look at the several types of Taylor wire. With a little creativity you could use Taylor wire and a set of original AC Delco coil boots and plug tips. MSD can be bought in bulk, too.

    The main problem with aftermarket wires is the boots don't fit correctly. Bigger wire and different resistances DO NOT equate to a "hotter spark". That's strictly advertising hype. Red spark plug wire is good for 5 hp at the Saturday evening drive-in hood-open lineup. Blue is better.

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    Ranger's Avatar
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    Re: Got a couple questions to ask...

    Quote Originally Posted by bigm57ict View Post
    192,000 miles on my Sedan Deville and I'm pretty sure the wires are original. They do have the numbers on them.
    WOW! Probably close to a record. Just don't touch or move them. Once you do, they'll most likely need replacement.

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    drewsdeville's Avatar
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    Quote Originally Posted by Submariner409 View Post

    The main problem with aftermarket wires is the boots don't fit correctly.
    Exactly!

  13. #12
    209 Big Bodies is offline Cadillac Owners Member
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    I also have the numbered wires and was going to change out the plugs and wires just because the car was sitting for about 8 years but now I am not so sure... Car runs just fine at 185k.

  14. #13
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    At 10 years, or 100K, plugs and wires should be replaced. Preventative maintenance.

  15. #14
    brougham is offline Cadillac Owners Master
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    Wires can last a long time. Chances are they are original but that doesn't necessarily mean they need replacing.
    Running regular gas is a hit and miss. Some people here run it with no problems other people can't. My 1994 doesn't like regular.

  16. #15
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Got a couple questions to ask... 1995 Deville tune-up and gasoline

    I'd tend to agree on the wires. If it ain't broke and the "Car runs just fine", don't fix it. They'll let you know when they need replacing.

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