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Old 10-23-2013, 03:07 PM   #1
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Spark plugs

What spark plugs do you guys recommend using? 03 automatic
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Old 10-23-2013, 03:23 PM   #2
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There's a couple good choices for which spark plugs to use. You'll also find a lot of strong opinions on which ones are better than others. So, I suggest trying a few searches on the forum to help your decision.

For an '03 v6, we normally would use the NGK Iridium IX plugs. They have a stock heat range of 5, and have iridium tips. So you can expect the plugs to last MUCH longer than any copper plug. It's not uncommon for these to last 80k miles!

This would be my first choice for any DD New Edge Mustang!

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Old 10-23-2013, 03:29 PM   #3
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ford motorcraft and call it a day. trust me
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Old 10-23-2013, 04:12 PM   #4
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No need to get expensive spark plugs with these engines, Only time my auto teacher recommended the higher grade spark plugs was for a ford modular engine, because he didn't like to change them on it and the higher grade ones are suppose to last longer.

Don't get like the dirt cheap ones though, like the next step up.
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Old 10-23-2013, 04:34 PM   #5
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Do you need a special tool to change them?
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Old 10-23-2013, 04:36 PM   #6
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Not really, just a spark plug socket and a basic ratchet set. Extensions help alot.
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Old 10-23-2013, 05:26 PM   #7
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ford motorcraft and call it a day. trust me
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Old 10-23-2013, 07:14 PM   #8
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ford motorcraft and call it a day. trust me
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Old 10-23-2013, 07:33 PM   #9
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What spark plugs do you guys recommend using? 03 automatic
Motorcraft Platinum/Spark Plug (SP-486) | 2003 Ford Mustang 6 Cylinders 4 3.8L SFI | AutoZone.com
Use these, they are cheap and what came on the car to begin with. You might want to get some antiseize to put on them before you put them in, itll help when you go to take them out next time. All you need is a ratchet and spark plug socket. If it's your first time, expect 1-2 hours
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Old 10-23-2013, 08:23 PM   #10
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1-2 hours?! My first time on my first stang took no more than 30 minutes. Now I can have em all swapped out in about 15 minutes.

They do come from the factory with motorcraft platinums, however going with the motorcraft coppers has shown a noticeable difference in performance and fuel economy. Combine those with the MSD streetfire coil pack and MSD wires and your good to go.
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Old 10-23-2013, 08:38 PM   #11
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Motorcraft/Autolite coppers.
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Old 10-23-2013, 09:19 PM   #12
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Thanks a lot guys I'm gonna go with the motorcraft coppers
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Old 10-24-2013, 09:46 AM   #13
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1-2 hours?! My first time on my first stang took no more than 30 minutes. Now I can have em all swapped out in about 15 minutes.

They do come from the factory with motorcraft platinums, however going with the motorcraft coppers has shown a noticeable difference in performance and fuel economy. Combine those with the MSD streetfire coil pack and MSD wires and your good to go.
That's how long it took me and it was my first time. It's hard reaching all of them
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Old 10-24-2013, 10:27 AM   #14
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Extentions and swivel sockets make it very easy. Mine is trickier with the strut tower brace and cai in the way on the passenger side. But even then it only takes a minute or so to pull the cai. Then I have plenty of room to get around the brace.
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Old 10-24-2013, 10:28 AM   #15
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Make sure you got the correct gap and don't over tighten them
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Old 10-24-2013, 10:28 AM   #16
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Gap em at .54
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Old 10-24-2013, 10:33 AM   #17
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I had mine gapped at .53 any difference?
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Old 10-24-2013, 05:17 PM   #18
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Yea I gapped them at .054 and ended up buying the motorcraft platinums. It was my first time and took about an hour and a half. Runs so much nicer! Thanks for the help guys
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Old 10-24-2013, 05:18 PM   #19
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One of the old plugs. I had 2 that were a lot worse

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Old 10-24-2013, 10:14 PM   #20
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Wow good thing you replaced them. No the recomendation is .052-.056 i just went with the middle
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Old 10-27-2013, 05:12 AM   #21
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Looks like I'm a tad late on this thread. I run NGK Iridium IX spark plugs on my '04 V6 and I gotta say that I do love them. But hey, both NGK and Motorcraft are good; and you definitely did your car a favor by changing your old ones out!
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