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Old 09-22-2012, 06:58 PM   #1
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Denso Iridium plugs. Yay or nay?

So, the time has come to replace my spark plugs. I was thinking of going with Denso Iridium ones, because I hear they're great plugs. Any insight as to if this is true for my 2.0 Zetec?


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Old 09-22-2012, 07:21 PM   #2
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nay

Motorcraft or Autolite only.
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Old 09-23-2012, 09:54 AM   #3
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Either stick with what the manufactor recommends or going with the Motorcraft or Autolite copper plugs. Other than that, you aren't going to see any significant increase using those plugs.
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Old 09-23-2012, 10:19 AM   #4
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Thanks guys! I got a set of Motorcraft SP-463's coming now. Here's a related question... I've heard that fuel economy drops when using a copper plug. But the copper plugs are hotter, resulting in more fuel burn. Why is this? I mean, I'm not really that worried about losing an MPG here or there to make a little power, I was just wondering why that is.
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Old 09-23-2012, 03:01 PM   #5
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The coppers (SP-463) is a colder plug.

I've no clue on MPG loss or gain.
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Old 09-23-2012, 04:20 PM   #6
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I love the autolite 104's.
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Old 09-24-2012, 12:03 AM   #7
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Never heard of a loss in mpg when using copper plugs. I didn't see a drop.
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Old 09-24-2012, 12:56 AM   #8
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Quote:
Originally Posted by 04RedRocket View Post
I love the autolite 104's.
Wrong engine bud.
The 104's don't fit a zetec.
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Old 09-24-2012, 10:48 AM   #9
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I got my Motorcraft SP-463's... The threaded part seems a little shorter than it should be. Should I be concerned? Or am I being a worry-wart?
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Old 09-24-2012, 11:04 AM   #10
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EDIT: BEWARE When you go to an auto parts store as I did and tell them SP-463 they may hand you plat tips. They did to me :( Can't afford 12$ right now to replace so... it for now
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