spark plugs or wires

D

destineal

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Contributor

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Black Mica #129

• Jan 26, 2011

• #1

i have a misfire on cylinder 4 p0304. If the plug was fouled out, wouldn't it misfire through out the rpm range(including WOT)?

 

H

HighSpeed

Member

:

2003 MazdaSpeed Protege

• Jan 26, 2011

• #2

Since the plugs are cheaper than a new set of coils and wires, try the plugs first.

 

D

destineal

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Contributor

:

Black Mica #129

• Jan 27, 2011

• #3

yea, i've had plugs for a while now. working at night, i don't wanna do anything but sleep during the day. i'll try to get up early enough to swap at least cylinder 4 out.

 

B

BOOSTR

1 OWNR MSP

• Jan 27, 2011

• #4

R&Ring 4 bolts, 4 boots and 4 plugs is well worth your time to avoid future problems.

Here's a good article on the subject.
http://www.aa1car.com/library/misfire.htm

 

D

destineal

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Contributor

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Black Mica #129

• Jan 28, 2011

• #5

It was the plugs. I HATE the slave setup

 

B

BOOSTR

1 OWNR MSP

• Jan 28, 2011

• #6

Glad you found the time and energy to get it done. Which plugs did you put it?

 

D

destineal

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Black Mica #129

• Jan 29, 2011

• #7

ZFR6F-11's My next set will probably be a step colder.

 

B

BOOSTR

1 OWNR MSP

• Jan 29, 2011

• #8

The 4291's. Good choice. I've been running them after the two sets of 3271's. I've yet to see a reason on any plug that I have pulled to use a colder plug in rolling 86K miles.

 

D

destineal

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:

Black Mica #129

• Jan 29, 2011

• #9

100k is less than 200mi away for me. I'm ready to get a beater to drive around.

 

B

BOOSTR

1 OWNR MSP

• Jan 29, 2011

• #10

Might not be a bad idea. You also need to add a timing belt kit to your "next purchase" list.

 

D

destineal

Member

Contributor

:

Black Mica #129

• Jan 29, 2011

• #11

lol I have all the belts, water pump, valve cover gasket. and so on. Its just too chilly to get motivated around here. I may do the fmic today though.

 

D

destineal

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Black Mica #129

• Feb 12, 2011

• #12

code came back. erased it

 

B

BOOSTR

1 OWNR MSP

• Feb 12, 2011

• #13

Guess its on to the next two parts of the equation, wires and/or coilpacks.

 

D

destineal

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:

Black Mica #129

• Feb 12, 2011

• #14

Yep. I'll wait until the code returns again then I'll get the good stuff

 

J

joka1

Member

Contributor

:

2002 Black Mica ES-T

• Feb 12, 2011

• #15

I have the same issue, Said screw it and bought 2 new coil packs today (autozone- 27 dollars each), NKG blue wires are in the mail also 4 Autolite AR3923 plugs. Should solve my issue.

Rob

 

H

HighSpeed

Member

:

2003 MazdaSpeed Protege

• Feb 13, 2011

• #16

Im not a huge fan of autolite plugs, they have always failed with me. I stick with Denso or NGK plugs.

 

J

joka1

Member

Contributor

:

2002 Black Mica ES-T

• Feb 13, 2011

• #17

I was running the NKG plugs............. but I followed the Mazdaspeed upgrade list and went with the Autolit racing copper plugs 1 step colder. I have a 1 CY misfire so plugs/ wires and coils are being changed before I bump up to 18 PSI

Rob

 

B

BOOSTR

1 OWNR MSP

• Feb 13, 2011

• #18

I was surprised to see you using Autolites over NGK/Denso but seeing how Mazdaspeed recommends them and they are a racing plug, guess they are worth a shot.

 

D

destineal

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Contributor

:

Black Mica #129

• Feb 14, 2011

• #19

p0304 has regressed to a p0300. What NGK Wireset did you get? Whats the best Coils to get?

 

B

BOOSTR

1 OWNR MSP

• Feb 14, 2011

• #20

Best would be OEM as they last a long time. But like everything else OEM they will come with a premium. So most parts stores coil packs are your next alternative and for wires go with NGK Premium Wire Set part no 5659. Shop on line for the best prices and no sales tax.