Spark plug replacement 2007 MS3

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robin2660

Member

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2007 Mazdaspeed3

• Nov 18, 2014

• #1

Quoted $350 from a Mazda dealer. Claimed 2 hours labor. I'm not gonna say who, because they've taken good care of me in the past. But, really?

Another Mazda dealer quoted $250 (parts included).

An independent guy quoted me $200, and that was $90 worth of spark plugs (that I can buy for $60) ... fair enough.

How do you guys fair?

I am tempted to do it myself, and well within my skillz range, but I am a little intimidated that I might run into trouble getting them out at 61K and 7 years.

 

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robin2660

Member

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2007 Mazdaspeed3

• Nov 18, 2014

• #2

Oops! Can moderator move this to the correct place?

Thank you!

 

M

magicka

Member

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2009 CWP MS3 GT

• Nov 18, 2014

• #3

Get some PBlaster. Try it yourself. If you still end up with a seized plug you can't get out, then take it to the shop.

 

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robin2660

Member

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2007 Mazdaspeed3

• Nov 19, 2014

• #4

I think I'll probably do that. Can someone tell me the correct plug socket size?

Thank you.

 

M

magicka

Member

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2009 CWP MS3 GT

• Nov 19, 2014

• #5

Denso ITV20 (5339) or NKG NGK ILTR6A-8G (6510) are stock replacements. You need Iridium plugs (both those are) and they should be gapped .026-.028 inches.

EDIT:

You'll need a 5/8" spark plug socket and an extension (~8").

 

Last edited: Nov 19, 2014

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robin2660

Member

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2007 Mazdaspeed3

• Nov 19, 2014

• #6

Thanks, Magicka!

 

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robin2660

Member

:

2007 Mazdaspeed3

• Nov 21, 2014

• #7

Question: NGK recommends .032 gap and Mazda recommends .028-.031.

What gives?

[edit] PS. My car is bone stock.

 

M

magicka

Member

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2009 CWP MS3 GT

• Nov 23, 2014

• #8

NGK ships the plugs with a .03 gap. Follow Mazda's recommendation and tighten them slightly.