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4BRE515Wed Jun-08-05 11:40 AM
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"Location of Spark Plugs? 98 MarkVIII"


          

I had my hood up, all the bolts out of my valve covers, and then it hit me.
Where in-the-name-of-all-that-is-holy are my spark plugs???

i'm at 81k miles and i know that the plugs haven't been changed in at least 12k miles because that's how long i've had her. I have the autolite a764 (going off memory, they were what NAPA recommended) set at a gap of .054 and new plug boots.

Could somebody PLEASE post or link a picture of where the spark plugs are on my 1998 Lincoln MarkVIII (4.6L engine with coil-on-plug ignition)?

Thanks!

  

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97MarkVIIILincolnMon Feb-21-05 04:14 AM
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#1. "RE: Location of Spark Plugs? 98 MarkVIII"
In response to Reply # 0


  

          

There is a cover on top of the valve covers that cover the coils. There are only two bolts (10mm I believe) that hold the covers tightly over each set of coils. Below the coils is oviously the spark plugs.


97 Opal Opalescent Mark VIII
232rwhp 237rwtq

  

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BlackIceLSCMon Feb-21-05 09:25 AM
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#2. "RE: Location of Spark Plugs? 98 MarkVIII"
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See the cover on the center of the driver's side valve cover? remove the two bolts holding that down, and your 4 COP(coil on plug) are below that. carefylly unplug, and lift the coil out, and using a long extension, and plug socket(I use a magnetic socket, makes it much easier), remove the plug.

yes...they are way down there.



94 Mark VIII-SPRUNG/97 Mark VIII LSC
Founder/President-Club 16
see profile for mods.
WARNING: Black Ice AHEAD!

  

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4BRE515Mon Feb-21-05 11:26 AM
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#3. "RE: Location of Spark Plugs? 98 MarkVIII"
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Thanks you guys! I'll see what i can do come Wednesday morning. Wish me luck!

  

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4BRE515Sun Feb-27-05 03:19 PM
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#4. "RE: Location of Spark Plugs? 98 MarkVIII"
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I got into the engine again today and changed my plugs. most were reddish/brown, didn't look too fubar'd at all, actually. New ones went in, tested the car, idles at 750rpm in drive.
SUCCESS!
thanks so much for the details and the picture!


now i'm gonna bore holes into my airbox...



'98 Mark VIII, pearl paint, biege leather int., 81k miles

  

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4BRE515Mon Feb-28-05 03:13 AM
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#5. "RE: Location of Spark Plugs? 98 MarkVIII"
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Bad news-
i have a misfiring problem. After i installed the first four plugs i tested the car to make sure i had done well. it tested out fine and idled at 750 without any incident. Changed the other four plugs, then drilled holes into my airbox and removed the silencer. Put everything back together and test drove the car and i was fairly pleased with it overall. Until it started.

I got onto the freeway after about 3 miles of city driving (i was able to push her to 80 without a problem at around mile 2, just to listen to this new "growl" without the silencer) and i felt it.
a miss.
couple seconds, another miss. Then it developed into a regular stutter by the time i got home, mile 6 i would guess.

Car cooled down, couple hours later, tried to drive it and it was nonstop shuddering at this point.

All my plugs were gapped at .054 which is what they're supposed to be, right? the plug boots all looked new and i hadn't seen any obvious tears or gaps or anything. In the morning tomorrow i'm gonna open her back up and double check that the plugs are screwed in tight enough, that the coils are pushed in hard enough, and that everything's connected.

Any suggestions?

Thanks for the support!

  

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wbrianMon Feb-28-05 08:39 AM
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#6. "RE: Location of Spark Plugs? 98 MarkVIII"
In response to Reply # 5


          

sounds like you've got a cracked insulator boot on one or more of the coils. Did you change out replaceable insulator boots when you did the plugs? I think they can be had at the dealer for a very reasonable price.

I'm a gen1 man myself, I just remember reading about the boots being prone to cracking (and consequent shorting out) just like the plug wire boots on our old-style (gen1) engines.

I'd add a word of caution. When my car got a miss due to a cracked (or several) plug wire boot, a short while after getting it fixed, my O2 sensors went out. I've no proof that the plug wire had anything to do with it - but my guess is that all the unburned gas due to the dead hole was more than the O2 sensor could handle.

W. Brian Fogarty
"Bond reflected that good Americans were fine people,
and most of them seemed to come from Texas..." - Casino Royale, Chapter VII

  

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BlackIceLSCMon Feb-28-05 09:07 AM
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#7. "RE: Location of Spark Plugs? 98 MarkVIII"
In response to Reply # 6


  

          

I'd work backwards, checking 1 cylinder at a time, from the last 4 plugs you did, to the first.

Was there any oil on the plug boots? Did you install dielectric grease on the boots?

I suspect a boot didnt grab the plug well, or perhaps had/has a crack that you just didnt see when you changed it.

Or, something is amiss with the airbox. Did you unplug the air charge sensor in the bottom of the airbox? It is held in with a small rubber grommet, on the rear face of the box, below the black tibe that goes to the throttle body. You might not have even noticed it come out when you removed the box for drilling.



94 Mark VIII-SPRUNG/97 Mark VIII LSC
Founder/President-Club 16
see profile for mods.
WARNING: Black Ice AHEAD!

  

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4BRE515Mon Feb-28-05 01:12 PM
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#8. "RE: Location of Spark Plugs? 98 MarkVIII"
In response to Reply # 0


          

holy dump.

I opened my mark up today to find where the wild things are and i got quite the surprise. passenger side plug boot, second from the front, had several tears in it. I'll post pictures if i can. I'm going down to NAPA now to get the right kind of boots.

  

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4BRE515Mon Feb-28-05 02:19 PM
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#9. "RE: Location of Spark Plugs? 98 MarkVIII"
In response to Reply # 8


          

i had to buy the whole coil at $46. What i had bought before was a plug boot but what i needed was a coil-over.

  

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