Tune Up?
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Northstar Engines and System Technical Discussion Discussion, Tune Up? in Cadillac Engine Technical Discussion; What does a good Tune Up involve?...
  1. #1
    STS 310's Avatar
    STS 310 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 STS
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    Tune Up?

    What does a good Tune Up involve?

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  3. #2
    JimHare's Avatar
    JimHare is offline Cadillac Owners Connoisseur
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    Re: Tune Up?



    1) One or Two wide-open throttle ("WOT") blasts up an expressway on-ramp per week should do the trick.

    2) Every 100K miles, change the plugs whether they need it or not.

    3) Check oil weekly. Do NOT overfill.

    4) Change green coolant every 2 years, add 2 tubes BarsLeak powder to lower Rad hose. If car has ALWAYS had orange stuff ('"DexCool"), you can go five years. But 2 bottles of Coolant is much cheaper than Head Gasket..why bother waiting?

    5) Drive it like ya stole it.

    The above suggestions gleaned from perusing this board for last 6 months. Consensus is near-unanimous on the above points.

  4. #3
    Geno Castellano is offline Cadillac Owners Fanatic
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    Re: Tune Up?

    Quote Originally Posted by STS 310
    What does a good Tune Up involve?

    Tuneup on a 96 Seville STS? Not much to tune up really. The OEM plugs are dual platinum tipped so they're easily good for 100,000 miles or more. Most of the time the biggest danger to the plug wires is pulling them off the plugs to check them. Leave them alone. Nothing else to "tune up" other then the plugs and wires. The ignition system requires no maintenance nor do the injectors or fuel system.

    If the vehicle has 100,000 or more on the clock, I'd clean the throttle body to avoid a sticky feeling throttle, replace the serpentine belt and the water pump belt and leave the rest alone.

    Unless you're having some sort of driveability issue that would require specific diagnosis there isn't much to do other than routine service of the oil (change per the oil life indicator) and the coolant 100,000 or 5 years.

    The advice about an occasional WOT blast is probably the best tuneup method out there for a Northstar.

  5. #4
    bcs296 is offline Cadillac Owners Member
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    Re: Tune Up?

    OK, so what would you recommend for a misfiring engine and occasional backfiring after coasting down to 30-35 from 70-75? The misfiring is not so bad that the car is un-drivable, but it is noticable. Getting off the highway, coasting down to city speeds to take an offramp, and then merging on to another highway right after, the engine will studder and backfire several times when getting back on the gas to accelerate. Eventually the problem will clear itself after 5-10 seconds. 97 STS, 80k mi

  6. #5
    Geno Castellano is offline Cadillac Owners Fanatic
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    Re: Tune Up?

    Quote Originally Posted by bcs296
    OK, so what would you recommend for a misfiring engine and occasional backfiring after coasting down to 30-35 from 70-75? The misfiring is not so bad that the car is un-drivable, but it is noticable. Getting off the highway, coasting down to city speeds to take an offramp, and then merging on to another highway right after, the engine will studder and backfire several times when getting back on the gas to accelerate. Eventually the problem will clear itself after 5-10 seconds. 97 STS, 80k mi
    The first thing that I'd check would be the fuel pressure regulator. Search this site for "fuel pressure regulator" for instructions.

    Checking the plug wires for continuity would also be adviseable. Pull the plugs and check for the platinum pads on the electrodes and plug condition. A fouled or black plug would give evidence of an injector leaking or possibly the misfiring cylinder due to a plug wire.

    It just takes some diagnosis. There's no magic plan to fix the problem without diagnosing what's causing the problem.

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