2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Spark PLugs

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Old Jul 22, 2003 | 09:01 AM
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Question Spark PLugs

Has anyone bought NGK 86-89 spark plugs From MazdaFormance.com?
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Old Jul 22, 2003 | 09:15 AM
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What number are they?

Should be:

2x BUR9EQ's
2x BUR7EQ's

You can also get them at Mazda..
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Old Jul 22, 2003 | 09:47 AM
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www.performancemotorcars.com

cheap prices and ultra fast and free shipping(if over $50).
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Old Jul 22, 2003 | 09:59 AM
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If there is CSK store near you, then I would suggest checking them out first.
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Old Jul 22, 2003 | 10:04 AM
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... Or the Mazda dealership..

Mazda had the best prices compared to anyone else In my region.
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Old Jul 22, 2003 | 03:55 PM
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The Only SlidinRX7
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Originally posted by Black13B
... Or the Mazda dealership..

Mazda had the best prices compared to anyone else In my region.
Wow, I would've thought that they would be charging people an arm and a leg.
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Old Jul 22, 2003 | 09:24 PM
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The nearest mazda dealer to me is in Farminton Hils MI and ive never been their so im probably definently going to buy online.
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Old Jul 22, 2003 | 09:31 PM
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I also don't know what the hell they mean by leading and trailing.
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Old Jul 22, 2003 | 09:40 PM
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Trailing = lower plugs
Leading = upper plugs

And yes, they're both different.
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Old Jul 22, 2003 | 09:48 PM
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Any local auto parts store should carry them, such as advanced or NAPA... Thats where I always get mine.
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Old Jul 22, 2003 | 09:52 PM
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From: Parts Unknown
Originally posted by Dan H
Trailing = lower plugs
Leading = upper plugs

And yes, they're both different.
You have it backwards dude...
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Old Jul 22, 2003 | 09:53 PM
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Originally posted by Rxmfn7
Any local auto parts store should carry them, such as advanced or NAPA... Thats where I always get mine.
I had to order them from NAPA. While waiting for my order, I went down to Mazda, and they had them in stock for 4 bucks cheaper.
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Old Jul 22, 2003 | 09:58 PM
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Originally posted by Mr. Gadget
You have it backwards dude...
You sure??
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Old Jul 22, 2003 | 10:01 PM
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Oops! My mistake!

Guess I found an error in the Haynes manual then.
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Old Jul 22, 2003 | 10:30 PM
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Is that error really in the haynes manual? Wow that is surprising that such a widely used manual has such a critical error that might cause a car to run like crap.

easy way to remember:
trailing=top
leading=lower
T1=top front rotor T2 top rear rotor
L1=lower front rotor L2 lower rear rotor
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Old Jul 22, 2003 | 10:38 PM
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How many plugs do you need in total?
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Old Jul 22, 2003 | 10:41 PM
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four 2 leading 2 trailing
bur9eq
bur7eq
I dont remember which ones off the top of my head are the leading and trailing but they have "L" or "T" on the box.
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Old Jul 22, 2003 | 10:47 PM
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ther is no mazda dealer neer me so i ordered from mazdaperformance. you find them any cheaper and they arived in just a few days
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Old Jul 22, 2003 | 10:49 PM
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From: Parts Unknown
Originally posted by ilike2eatricers
four 2 leading 2 trailing
bur9eq
bur7eq
I dont remember which ones off the top of my head are the leading and trailing but they have "L" or "T" on the box.
and the trailing plug has a green band on it where the leading does not
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Old Jul 22, 2003 | 11:50 PM
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Originally posted by ilike2eatricers
Is that error really in the haynes manual? Wow that is surprising that such a widely used manual has such a critical error that might cause a car to run like crap.

easy way to remember:
trailing=top
leading=lower
T1=top front rotor T2 top rear rotor
L1=lower front rotor L2 lower rear rotor
Yup! I couldn't remember off the top of my head (even though I've changed spark plugs before) so I just took a quick reference in my Haynes manual. I have the 86-91 version and it says on page 54 and I quote, "leading plugs go into the upper spark plug holes and trailing plugs go in the lower hole."

Then I looked up a wiring diagram and saw that I was wrong.
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Old Jul 22, 2003 | 11:59 PM
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From: ct
Originally posted by Black13B
What number are they?

Should be:

2x BUR9EQ's
2x BUR7EQ's


i heard for better power responce you should get all bur9eq's.

is this true? is it that the leading plug makes a bigger spark?or the trailing makes a bigger spark? whats the difference between these plugs?
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Old Jul 23, 2003 | 12:24 AM
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So wait i got screwed by kreagan!!! they gave me all ngk bur7eq's. is this a big problem, And should get all bur9's or bur7's or both?
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Old Jul 23, 2003 | 12:50 AM
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It comes down to how you drive and engine condition, if you get stuck in traffic then 8 or 7 are fine, if it's all freeway crusing then 9

If your engine is on the older side, then 9 will not last as long especially if you get stuck in traffic.
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Old Jul 23, 2003 | 01:33 AM
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thanks, well i haev curently all 7's but i think they gave me all trailing or all leading, and i didnt notice, ok ill admit i didnt know, is this really bad or what? the car seems to run just like before.
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Old Jul 23, 2003 | 10:40 AM
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Ive already been to every auto parts place around here, no one will order the plugs.
So im just gonna go with mazdfaformance
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