Just bought a 98 Deville - info please!
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Just bought a 98 Deville - info please! in Past Cadillac Vehicle Discussion; Hey guys I'm new here, I just nought my first Cadillac, a 98 deville 4 door with 102, 000 miles. ...
  1. #1
    amchenry is offline Cadillac Owners Member
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    Just bought a 98 Deville - info please!

    Hey guys I'm new here, I just nought my first Cadillac, a 98 deville 4 door with 102, 000 miles.

    I'm looking for info on if there are some recommended performance upgrades and where to find them. Also is it time to replace plugs? Wires? Coil packs? And if so which ones? I've commuted this car to work for three or four days and some mixed driving, getting 23 mpg. Seems like it rides nice but there is a noticabnoticeable light dimming when I hit the brakes. Possible voltage regulator? Or maybe a bad ground?

    Was definitely looking for a programmer if they exist and possibly intake? Exhaust? Am I being crazy to look for that stuff?

    Thanks for any info guys!

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    LoveMyLac is offline Cadillac Owners Member
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    Re: just bought a 98 deville info please!

    Do you have any previous service history? if the spark plugs haven't been changed the front plugs are easy to check. just pull one and inspect. Only replace with AC Delco double platinum. N* is picky.

  4. #3
    stoveguyy is offline Cadillac Owners Connoisseur
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    No chips or tunes or intakes for this car. U got a 15yr old, grandpa car and what to hotrod it? Well, it is a V8, you got that going for you. If u wanted to fiddle around u should have got a supercharged V6 like a Bonne ssei or maybe a grand prix.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: just bought a 98 deville info please!

    Quote Originally Posted by amchenry View Post
    Hey guys I'm new here, I just nought my first Cadillac, a 98 deville 4 door with 102, 000 miles.

    I'm looking for info on if there are some recommended performance upgrades and where to find them. Also is it time to replace plugs? Wires? Coil packs? And if so which ones? I've commuted this car to work for three or four days and some mixed driving, getting 23 mpg. Seems like it rides nice but there is a noticabnoticeable light dimming when I hit the brakes. Possible voltage regulator? Or maybe a bad ground?

    Was definitely looking for a programmer if they exist and possibly intake? Exhaust? Am I being crazy to look for that stuff?

    Thanks for any info guys!
    ------------------------------
    I'm looking for info on if there are some recommended performance upgrades
    and where to find them

    over the years - I have created a list of ALL "proven effective" upgrades -
    these upgrades will either increase horsepower - or gas mileage - OR BOTH -

    this list includes EVERY add-on - bolt-on -screw-on - glue-on - tape-on -
    pour-in - pour-on - pour-over - plug-in - unplug - disconnect - or remove -

    EVERYTHING THAT WORKS
    IS LISTED BETWEEN THE TWO RED LINES -

    READY? - OK - HERE IS THE LIST -

    __________________________________________
    __________________________________________


    is it time to replace plugs?
    sparkplugs are due at 100K miles -
    ONLY USE ACDELCO Part # 41950 -
    or DENSO Part # 5070 -

    there is a $12 rebate on the Delco plugs until 12/31 -
    http://www.acdelco.com/pdf/Spark%20P...ate%20form.pdf

    Wires?
    couldn't hurt - I would recommend -
    BOSCH Part # 09754 -
    or DELPHI Part # XS10236 -
    or DENSO Part # 6718065
    or ACDELCO Part # 9748Q
    any of the above sets should run around $55 to $60 -

    Coil packs?
    those only get replaced if defective -

    Was definitely looking for a programmer
    nope -

    possibly intake?
    nope -

    Exhaust?
    nope -
    you can make the exhaust louder -
    but ZERO performance gain -

    Am I being crazy to look for that stuff?
    YEP -

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: just bought a 98 deville info please!

    Quote Originally Posted by basscatt View Post
    ONLY USE ACDELCO Part # 41947 -
    or DENSO Part # 5070 -
    Bass, don't you mean 41-950?

    P.S.

  7. #6
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: just bought a 98 deville info please!

    Quote Originally Posted by Ranger View Post
    Bass, don't you mean 41-950?

    P.S.
    -------------------------
    rockauto shows that # - but - yes - I changed it -

  8. #7
    RippyPartsDept's Avatar
    RippyPartsDept is online now Hi, I'm Chris - Please Read My Signature
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    Re: just bought a 98 deville info please!

    ACD#41-947 is an old part number that has since been changed to #47-950

    if I punch the old number into my acdelco ordering system it automatically changes to the new number

    .... just FYI
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
    Rippy is a Cadillac, Hummer, Saturn & Saab dealership & Official Saab Service Center
    ~~ Family owned and operated in Wilmington, NC since 1946 ~~
    We offer all forum members discounts on parts and freight
    phone: 800-RIPPY-22
    <-- insert standard boilerplate about posts not necessarily representing my employer, etc -->

  9. #8
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: just bought a 98 deville info please!

    Quote Originally Posted by RippyPartsDept View Post
    ACD#41-947 is an old part number that has since been changed to #47-950

    if I punch the old number into my acdelco ordering system it automatically changes to the new number

    .... just FYI
    ---------------------
    thanks Chris - that splains it -

  10. #9
    amchenry is offline Cadillac Owners Member
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    Thanks guys, appreciate all the info. Wasnt really looking to "hot rod it" but I've had a lot of good luck with giving the gm motors a little extra "juice" and better mpg at a minimum. Looking forward to digging into it.

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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: just bought a 98 deville info please!

    amchenry, You have a 275 hp 3.11 economy final drive family sedan that is electronically speed limited to 112 mph. No "upgrades" for performance per se. No exhausts, no "chips', no intakes (the existing CAI flows more air than the engine can use at redline WOT as-is). Forget the hyped cutesy air filters - nothing there, either. Keep it clean, keep it stock and enjoy a Cadillac, not a ricer.

    If you're dead set on fooling with fuel mixtures and maybe shift points (to no power advantage), talk to Wester's Garage in Canada.

    Saw your last post - giving the Northstar "a little more juice" is a perfect search for the Holy Grail, especially when the engine is in our FWD PCM-controlled environment.

    Before you "dig into it", Please go way up ^^^ to the top black bar and study the Cadillac Technical Archive, then study the sticky posts at the top of the Engines, Northstar threads. Then get either a GM/Helm service manual set or a subscription to www.alldatadiy.com . You'll need the reference materials because NOTHING in these cars is like anything you've messed with before.

    Where's the water pump on a Northstar ?

    Lights dim when brakes applied. Marginal battery, poor battery terminal connections (all 4 ends), poor alternator (voltage regulator) connector pins.

  12. #11
    amchenry is offline Cadillac Owners Member
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    Monkeys at the garage had "helped" my wife out by installing a new battery. Turns out they cross threaded the neg. Terminal hence poor starting and lights dimming. Problem solved!

    Since I know oil is an ever lasting debate, are there any to actually stay away from with the northstar?

  13. #12
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: Just bought a 98 Deville - info please!

    Your 1998 Northstar uses flat tappet cam followers (lifters). There is a school of thought that opines the level of anti-scuff (ZDDP) additives in today's SM and SN engine oils is not enough to protect the cam and followers from premature wear. You might want to look into a HD fleet or marine 10W-30 oil - whatever type floats your boat - for its slightly elevated ZDDP load.

    Some of the so-called "high mileage" oils also carry a higher ZDDP load - Google the oil companies and dig for their specification sheets. (Shell, Pennzoil, and Quaker State are all SOPUS oils: Shell Oil Products U.S.)

    The Northstar, or any other engine, is not particularly finicky when it comes to engine oils - simply use the correct type/viscosity range.

    This table shows that your engine was rated for a SH rated engine oil.

  14. #13
    amchenry is offline Cadillac Owners Member
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    Thanks for the chart and info, anyone know of a full synthetic that will do the trick? This car Is rated for 10w-30 but I've run the mobile 1 0w-40 in a few different gm motors and had a much smoother idle and assuming smoother running motor overall. I realize this is a "special" motor. (Not sure yet if its helmet special or good special) so please let me know if this would be fine or if there are other full synthetics thatni shoild hunt for

  15. #14
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    Re: Just bought a 98 Deville - info please!

    Any 10W-30 will do. I would NOT use 0W-40. I think you are asking for trouble. Hell, I won't even use 5W-30. But that's just my $.02

  16. #15
    stoveguyy is offline Cadillac Owners Connoisseur
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    10-30 syn is good. 0-30 is nice for winter

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