Spark plugs in 4.6 - Mustang Evolution

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Old 02-25-2016, 08:17 AM   #1
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Spark plugs in 4.6

I'm getting confused, does the fuel rail need removed in order to get to the spark plugs?

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Old 02-25-2016, 08:19 AM   #2
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No. It makes things easier but is not necessary
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Old 02-25-2016, 08:28 AM   #3
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Lol no. Spark plugs take an hour to do max. Maybe a little longer in a 99-04 car because of the stupid COP retaining bolts. On a 96-98 its silly easy.
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Old 02-25-2016, 10:10 AM   #4
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It's a 2002, but it looked like the fuel rail was in the way, just trying to confirm

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Old 02-25-2016, 10:21 AM   #5
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Remove the COPs, rebuild them while they are out ($30 boot and spring kit) and you get the spark plugs out with a magnetic spark plug socket and an extension. I've found a 10" extension with a wobble end is really good for this. Cheap at Harbor Freight.
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Old 02-25-2016, 10:22 AM   #6
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Ok, COPs do you mean the leads?

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Old 02-25-2016, 10:28 AM   #7
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No, the COPs are the coils... when you do the plugs you should always do the boots/springs on the COPs as well. Its basically like doing the wires on a 98-down car.
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Old 02-25-2016, 10:30 AM   #8
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Ok, thanks. Good info. I feel like if I replace these spark plugs I'll have better response time and better idle, I have a suspicion that they are fouled

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Old 02-25-2016, 10:33 AM   #9
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When you do, make sure you are using the correct plug, check the gap, use anti-seize and USE A TORQUE WRENCH. 12-15ft lbs WITH ANTISEIZE for these heads.
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Old 02-25-2016, 10:36 AM   #10
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Is there a spec page somewhere that states the correct spark plug gap? Not sure if these will be the correct gap that is in there already. They are not original.....at least I hope they are not

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Old 02-25-2016, 10:40 AM   #11
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Get Autolite APP104 plugs. Gap them to .054 if you are stock.
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Old 02-25-2016, 10:41 AM   #12
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Ok thank you

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Old 02-25-2016, 03:00 PM   #13
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Yeah make sure to torque to spec with antiseize or you will strip them out. I know for experience lol

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Old 02-25-2016, 03:21 PM   #14
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Yeah make sure to torque to spec with antiseize or you will strip them out. I know for experience lol

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Lol that would suck, hard to find an easy out for that

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Old 02-25-2016, 03:52 PM   #15
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Ok, thanks. Good info. I feel like if I replace these spark plugs I'll have better response time and better idle, I have a suspicion that they are fouled

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Why do u suspect they're fouled? Is it missing? Probably one of the cops, not plugs if it is. They're notorious for fouling up, however, if u want better throttle response, you'll need to change ur tb/plenum

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Old 02-25-2016, 03:57 PM   #16
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Why do u suspect they're fouled? Is it missing? Probably one of the cops, not plugs if it is. They're notorious for fouling up, however, if u want better throttle response, you'll need to change ur tb/plenum

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Yeah I would like a new tb, still stock
I have a nice cold air intake though

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Old 02-25-2016, 04:39 PM   #17
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Yeah, if you can afford them, go ahead and replace the COP's...if not, be super easy on them while taking them out. If they stretch too much, they can become porous, which will make your car misfire

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Old 02-25-2016, 04:40 PM   #18
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Yeah, if you can afford them, go ahead and replace the COP's...if not, be super easy on them while taking them out. If they stretch too much, they can become porous, which will make your car misfire

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Ok thanks

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Old 02-25-2016, 04:49 PM   #19
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Anyone can afford it. Its $30 to rebuild them. No reason to ever buy new ones really, the electronic part almost never goes bad especially OEM Ford ones.
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Old 02-25-2016, 04:50 PM   #20
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Anyone can afford it. Its $30 to rebuild them. No reason to ever buy new ones really, the electronic part almost never goes bad especially OEM Ford ones.
Yeah, I'm having trouble trying to locate a rebuild kit

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Old 02-25-2016, 04:52 PM   #21
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http://www.amazon.com/Denso-671-8110...ype=automotive
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Old 02-25-2016, 04:53 PM   #22
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Thank you!

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Old 02-25-2016, 04:53 PM   #23
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Anyone can afford it. Its $30 to rebuild them. No reason to ever buy new ones really, the electronic part almost never goes bad especially OEM Ford ones.
There is one reason....it's the one I used.....straight up lazy with $$ to spend...ironically, I found the bad one when replacing them all, leaving me with 7good cops, and a $500 hole in my pocket.

Yup, just rebuild em (or I'll give u a deal on some used)

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Old 02-25-2016, 04:54 PM   #24
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There is one reason....it's the one I used.....straight up lazy with $$ to spend...ironically, I found the bad one when replacing them all, leaving me with 7good cops, and a $500 hole in my pocket.

Yup, just rebuild em (or I'll give u a deal on some used)

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Ok cool, will do!


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Old 02-25-2016, 07:14 PM   #25
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I got 8 mint ones with the 2V pullout motor I got with 39k on it. So I have 8 spares now for my Expy and Stang. Just rebuilt the ones on the Expy tho. 140k and they are rocking.

As far as lazy factor... I dunno it literally takes 10 seconds to rebuild one. Pull the boot right off, spring pulls right out and they go right back together.

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Old 02-25-2016, 07:45 PM   #26
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$45 is a lot sometimes...they are easy to replace...so I just assume to be careful and reuse them, if I have a problem then simply unscrew 8 coils and fork out the money if I have to...if no problem, then I saved $45 plus my time. It's not like the car won't run with a couple of them with a slight misfire.

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Old 02-26-2016, 09:25 AM   #27
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Im trying to understand how a slight metal fatigued coil will cause a misfire, it seems like it is pretty contained in the pack to almost always have conductivity

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Old 02-26-2016, 10:42 AM   #28
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Fatigued metal has high resistance. High resistance means no current flow. No current flow means no spark/weak spark. No spark/ weak spark means misfire.


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