97 Lincoln Mark VIII Tune Up

Lincoln Mark VIII

  1. Mike Pizzuto

    Mike Pizzuto LVC Member

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    Hello everyone. Gave away my 98 to my buddy who totaled his car. My little brother got a 97 Mark VIII. It’s a slug compared to 98. Was looking to see what the best for a tune up for the 97 (plugs coils filters etc) to maybe see if it’ll run a little better. What do you guys recommend? Less than 500$ thank you !
     
  2. germansheperd

    germansheperd Active LVC Member

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    I’d start out with MOTORCRAFT coils, either Motorcraft or NGK plugs, and a quality fuel and air filter and I bet she runs noticeably better.
     
  3. Mike Pizzuto

    Mike Pizzuto LVC Member

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    Motocraft over Accell coils or MSD?
     
  4. germansheperd

    germansheperd Active LVC Member

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    Motorcraft over anything.......you have been warned!
     
  5. Lownslowlsc

    Lownslowlsc Dedicated LVC Member

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    If it isn't misfiring I wouldn't bother with the coils. I would put in some basic Autolite Plats, change fuel/air filter and be sure that the imrc are working properly.
     
  6. LandYachts

    LandYachts LVC Member

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    WIX filter. WIX. Filter.
    I changed my IAC at the same time as I did the air filter, belt, plugs and I de-carboned the throttle body and cleaned the MAF sensor. Thing idles like an absolute dream and seams to maybe hesitate a little less.

    You will need:
    IAC
    Plugs
    WIX filter
    Dayco serpentine belt
    Carb cleaner
    MAF sensor cleaner
    Throttle body gasket
    Valve grinding compound
    Sand paper
    Air compressor
    Torque wrench

    If you feel like doing these things, let me know. I have a lot of tips in that regard that will save you about a hundred moolah$ down the road.

    The recommended tune-up interval on these cars is (deep breath) 100,000 miles. So people often forget and the dealers often don't recommend it comes in so it gets overlooked or they don't consider the time interval. My car had 75,000 miles... but after 20-years you just gotta do these things.
     
  7. unity

    unity Dedicated LVC Member

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    The 100k interval pertains to the spark plugs. That is the life cycle of the OEM plugs and they really do last that long.

    Coils - indeed, if they are not failing there is no need to replace them. And MSD is crap. Only fools buy that stuff. With that said the COP version of the 4.6 can produce a situation where un-load/OT it produces a bog-down feel. This is often a coil misfiring but it wont feel like it, instead it will feel like you are towing a boat. The cause is usually oil at the base of the boot. So the solution is to replace the tower seals between the towers and valve covers and install new boots all around. Then you are set for a very long time.

    Intake filter - NEVER use those stupid K&N oil filters. A decent paper filter with a yearly change will be fine. The oil on these things will take out a MAF. Paper keeps it clean and simple.

    IMRCs - as mentioned, make sure they are operating properly. To be honest, the Mark's top end is pretty easy to take apart. If you feel up to it, I really recommend pulling the intake and the IMRCs for a good cleaning. Takes a weekend at most. I have dont a top end cleaning in a matter of hours once you are familiar with the engine. So like most things, the second time around is much quicker.

    Plugs - any plug will be fine. Do NOT go multi-electrode (ground). Again, marketing at its best and its nice to see these fading into memory. Cooper plugs work really well and are cheap. But you will end up replacing every year. Platinum and double-platinum are OEM (Ford used two different plugs on the same engine) and will last much longer. Really plug choice comes down to how often you want to change them more than any actual performance gains, etc. Its not a formula one race car after all.

    TB cleaning - As I think you know, clean the throttle body only when removed, never installed.
     
  8. LandYachts

    LandYachts LVC Member

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    Unity you mention these cars using two different plugs. My manual only lists one plug and I just pulled my plugs and they’re all the same. They’re also likely from the factory.

    I believe only the dual-output coil Marks requires two plugs. Makes sense, as the spark only goes in one-direction in a dual-output and wears each plug differently.
     
  9. unity

    unity Dedicated LVC Member

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    If they are factory plugs, one will have yellow markings the other blue. Not sure what you mean by dual-output coils. But ALL marks are wasted-spark setup. While the COP version may have more effective coils, they are still fired in pairs - this I know all too well because I covered a 96 to COP from coil packs. Still used my same computer.
     
  10. chris2523

    chris2523 93 Mark VIII

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    COP can run in waste spark but they dont like to. there are side effects.
    many a racer has had to uncovert from cop with older PCMs to cure spark blowout.
     
  11. LandYachts

    LandYachts LVC Member

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    That seams like a cheap way of cutting corners while making some improvement otherwise. I don’t put it past Ford to do what works without fiddling with things unnecessarily.

    It’s so odd that 97-98 would have different plugs considering they aren’t using the same coil.

    The reason plugs would need to be different would either be thermal differences or the use of dual-output coils. I see this in motorcycles often.

    Thermal:
    In the case of bikes such as the Honda Magna, it is a transverse V4 engine. This means that one bank is directly in the air stream, the other relies on the liquid cooling as it gets little air. Because of this difference in thermal conditions, the rear cylinders are jetted for fuel differently and use different plugs than the front cylinders.

    Dual-output Coils:
    Coil-packs have dual-outputs. This means that a spark is made at two leads at the same time. Yes, this is what’s used in a wasted spark system most often. This is not because a wasted spark is required, but because the use of coil-packs has the side effect of a wasted spark.

    One issue with coil-packs is that the spark has a bias due to polarity. The spark will always jump from one ground strap, through the coil and to the other ground strap. When I pull the plugs in any dual-output ignition system, it’s clear that one has material transferred to the ground strap and the other has material missing from the ground strap.

    So with these two being the only reasons I could explain the necessity for different plugs, and only one that I know of that applied to any Mark VIII at a time, it makes no sense to me that the one conditon which no longer exists in 97-98 Marks still require different plugs.

    The ONLY explanation that makes sense now is if Ford decided to match the polarity of the new COP’s to the polarity of the coil-packs. I have no clue why this would be necessary....because it isn’t, but that is the only explanation I can come up with.

    To prove this, I would need to see the plugs for the COP’s.
    If the ground wire is in the same pin position for every connector, then every COP has the same polarity. If not, then my theory is correct and we may require the different plugs.

    Of course, if the polarity is swapped on some coils, you could just swap the pins and the spark would always jump TO the ground strap as it should.

    Yes I have autism.

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    When I was a mechanic, I sometimes had to test polarity because I would use unorthodox methods for repair. This sometimes mean using coils from different brands than the motorcycle. But nobody specifies which wire is which, so I would just test polarity and run it. Most often it was the Yamaha XS coils that were best for old bikes. Really good stuff. But the Chinese versions actually have reversed polarity...sometimes! So I’d have to check every coil to be sure I was installing them the right way.

    If it was strong enough I could see which side of the spark was fatter or flared, or I could stick something conductive in between them and see which side flared.

    Or to check without undoing any wires, I could run a voltmeter parallel to the plug that’s in the head. It would either read positive or negative with every spark. If it was positive, it was correct, but I had to make sure my probe wires were oriented correctly as well.

    I know I talk to much.

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    Last edited: Sep 8, 2018
  12. unity

    unity Dedicated LVC Member

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    Wasted spark was for emissions sake. To burn unspent fuel at the exhaust stage - that is what Ford says at least.

    The COP system on a Mark is wired in series. Remember, the PCM directly initiates firing on ODB II (1996 up), not a separate EDIS box and there are only four triggers. In theory, the same computer can run a four cylinder setup. I had originally wired my COP conversion in parallel as it "made sense" at the time. The car never ran. With limited knowledge by myself and those online (no one could figure it out) I re-wired to series and it instantly fired up. A year long project with a swap to a 2004 Aviator engine was complete. As for polarity, that would change because now there are two components in series.

    If I recall, one side was platinum the other double?? Using two different types was maybe a cost saving plan? Making thousands of cars, every dollar counts. Just like fleet fuel economy stuff. But when purchasing new, I think they are all double and the yellow ones were only put in at factory. Factory, two parts for plugs but replacements under one part number.

    Note: "One half of the spark plugs fire from the center electrode to the ground electrode and the other half fires from the ground electrode to the center electrode. The EEC fires two spark plugs simultaneously. One spark plug on the compression stroke uses the majority of the coils stored energy, the other spark plug on the exhaust stroke uses very little of the coils stored energy. This is the reason why you may have found AWSF-32PG and AWSF-32P plugs in your 1996 and later 4.6L vehicles when changing spark plugs. Only half of the plugs will wear out faster than the others. Ford only needed half of the spark plugs to be full platinum, so this was done to save cost. The replacement for these are AWSF-32PP, or 8 double platinum plugs. Later on Ford changed their suffix designation on the platinum plugs to “EE”."
     
  13. LandYachts

    LandYachts LVC Member

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    So that explains why the manual says to replace with EE suffix plugs.
     
  14. chris2523

    chris2523 93 Mark VIII

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    97 98 has 8 triggers. each COP is independent.
    they are not in series or parallel.
    this is why COP is flaky in 93-96 applications.

    its true that 96 does away with the edis8, but 97 98 is totally different yet again.
     
  15. LandYachts

    LandYachts LVC Member

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    So then it makes no sense why 97-98 have different plugs. Man I’m scratching my head now
     
  16. unity

    unity Dedicated LVC Member

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    I guess its irrelevant since one would not replace them with different plugs.

    Im more surprised they removed wasted spark in the 97-98 setup. Odd.
     
    Last edited: Sep 9, 2018

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