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-   -   Denso Iridium plugs. Yay or nay? (

Andrews-bad-SE 09-22-2012 06:58 PM

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?

iminhell 09-22-2012 07:21 PM


Motorcraft or Autolite only.

zetecDon 09-23-2012 09:54 AM

1 Attachment(s)
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.

Andrews-bad-SE 09-23-2012 10:19 AM

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.

iminhell 09-23-2012 03:01 PM

The coppers (SP-463) is a colder plug.

I've no clue on MPG loss or gain.

04RedRocket 09-23-2012 04:20 PM

I love the autolite 104's.

Blue5ive 09-24-2012 12:03 AM

Never heard of a loss in mpg when using copper plugs. I didn't see a drop.

iminhell 09-24-2012 12:56 AM


Originally Posted by 04RedRocket (Post 4369388)
I love the autolite 104's.

Wrong engine bud.
The 104's don't fit a zetec.

Andrews-bad-SE 09-24-2012 10:48 AM

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?

Gobliz 09-24-2012 11:04 AM

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 [:I]

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