miker2005

i havent had any issues with my original ones?; i am doing a few things to my 2005 nordic green 6mt this spring to get her ready for summer; i have 57000 kms it; i have replaced the air filters, i am painting my brake calipers, getting new summer tires; however, i have started to think about coils and plugs; should i replace them regardless of their current operating conditions?; i have noticed a decline in gas mileage over past few months, but only very slightly (no mods to the car at all); any advice would be appreciated; the engine runs like a top (no power loss or missing or anything related) but i am thinking it may be time to change the plugs/coils out; thx;

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myriadshalaks

sure. i think i heard every 40k miles is good, but i could be remembering wrong. i'm thinking about replacing mine at 15k miles.

you could get green wires or some nicer looking and better performing wires.

i think a set of plugs and wires is running you about 160 these days plus shipping.

make sure you put them in the right place.

oh, and i think you have old oem plugs. i'm pretty sure the newer cars got better ngk plugs from the factory. those are for sale too.

nycgps

replace them regardless. It doesnt hurt you know. (hurts your wallet a bit thats all)

miker2005

thanks to myriadshalaks and nycgps for your advice;

i have decided to replace plugs and coils, already ordered the parts from fluid motorsports;

dillsrotary

I too thought the same thing a couple months ago, then my car died while driving to vacation. Change em out, it'll save ya in the end.

04RX8man

yeah i recommend changing them also......

rx8cited

Do you guys recommend changing the spark plug wires at the same time? If yes, Mazda wires or what? TIA

nycgps

Mazda wires will do just fine. IMO Just replace them every 50k miles or so should be more than enough.

but of course, you can always go aftermarket, probably cheaper and better !

Old Rotor

If you're stock you can easily get 35K mikes, some have got more out of OEM NGK(THE BEST) spark plugs. That's if the engine has not been flooded and it's in good tune and condition. The wires should last about four years, less in both extreme conditions. Stock wires ran me about fifty five dollars and are good quality. There are others that are good as well for around the same price or more.

04RX8man

where is everyone buying their coils/plugs/wires from? I went to the dealer to get prices and they are tryin to rape me 190 bucks for plugs 95 for wires and like 45 per coil.....I know I can get NGK plugs at advance auto for 20 a piece but can't seem to find anything else anywhere. Anyone have a good online site?

Old Rotor

Myself I just emailed my list of parts(longer the better)to vendors I found on this site. I got a bunch of bids and some will ship free.

nycgps

You've been pm'ed

Red Rex

Not to point fingers but I've seen some really paranoid posts on this site regarding coils and plugs. Some seem to think the car will implode if you don't change the plugs, wires, and coils every 10K miles. I'm almost at 42K miles. The car got its first plug change (needed it but not badly) at 40,500 miles and is still on original coils. Runs just fine. Pulls strong and I get the factory claimed mpg when I drive sanely. There's a difference between changing parts early and just throwing money away.

Hoodster

Just changed out coils, plugs and wires yesterday while I had the car on jacks. I purchased this equipment through Rosenthal Mazda. I have 47,000 miles on my car, 04 6 speed. My Leading after rotor plug had the tip that connects to the wire broke right off so I was getting nothing from that plug.
Mazda here in Nova Scotia, Canada wanted $950 to replace the coils, labor and parts included. I spent much less than that getting the parts from Rosenthal.
I helps to have an extra set of hands when it comes to getting at the plugs. I decided to get at the plugs from beneath the car, they're right there.

Anyhow, I highly recommend to anyone who wants to get to know their 8 better and is not a mechanic junkie but I guy who wants to learn a bit, do this job your self. You will be happy you did when you take her on the road.

invasion08

Coils only last around 30k if your lucky, The performance of the coils will decrease and you will not be able to feel any difference. I bet if you were to do a dyno run with your coils that have 42k miles on them and then install new coils you will see and feel a difference.

miker2005

i am wondering now if i should do my wires too while i am at it;

delhi

Guys, you do know he is quoting in kilometres.... so 50,000km is like what? 30k miles? Damn metric. Work of the devil I tell ya!

nycgps

stock coils kinda suck, I have a set that I got under warranty, brand new, but wont even last more than 10 K miles Without giving me misfires at high rpm. Replaced them the problem went away, lets see how long this set would last.

04RX8man

my coils and plugs are original at 45.xxx miles and have not gotten any misfires(knock on wood) but I know it's time I'm sure i will see a MPG gain and performance gain by just doing coils and plugs as i'm going to wait on the wires for now since i'm in the middle of moving and don't know how much this move is going to cost me

ASH8

I strongly suggest to all if you are in a position to remove and inspect your spark plugs please do so, there is no badge of honor in achieving some record distance with your plugs.

You don't want to have a piece of electrode or it's bridge falling off inside your engine, although it is very small it can scour or even jam a side seal.
This can occur with no real performance loss.

IMO 40K miles are these plugs safe and maximum life.

Sometimes a cars performance can degrade ever so slightly month after month you do not really notice and you think everything is OK until you look or change them, then you can see what performance or MPG you were missing out on.

Do it now.

04RX8man

yeah I am moving next thursday....if I can get the parts shipped here within that time period I will do it here before the move if not then it will have to wait a couple weeks

Old Rotor

+1 on that...well writen....I was driving about 4K a month back in '71 on my first RX and the dealer asked if I would bring in my car for free spark plugs every time I felt the need. Back then I could get 4 to 5 thousand miles and then feel a slight hesitation when stabbing the accelerator. New ones would always help if they got the heat range correct. They would try all kinds of brands. If you know your car and new plugs are put in when they are needed you can feel it. New plugs gap don't change much like the old days with the new exotic tips they use . A gap use to change one to two thousands every one thousand miles. Now with the OEM-NGK(Best Plugs) at 35K miles you wear one or two thousands.