Code P0300 Mazda RX-8 Misfiring Cylinder 1 Ignition coils replacement step by step

Mazda RX-8 Misfiring Cylinder 1 Ignition coils replacement step by step

Mazda RX-8 Related Service videos

1. How To Install RX-8 Spark Plugs Correctly with 2 Trailing Spark Plugs on top and 2 Leading on bottom https://youtu.be/KE5V96K2l2k

2. How to install Ignition Coils in correct order with Leading 1 Trailing 1 Leading 2 Trailing 2
https://youtu.be/VoDaQ89OhIM

3. Mazda RX-8 P0661 Check Engine code problem solved https://youtu.be/82ryrpJ3NEU

4. How to Pre Mix 2 Cycle Engine Oil into Mazda RX-8 https://youtu.be/BpBIhA46pnw

5. Mazda RX-8 P0661 Code How to test Solenoids correctly to find the bad ones https://youtu.be/ta5oMsotNpo

how do I know if I need new ignition coils or not?

Loss in power is one of the best ways to know your coils are failing. If you pull your coils off and look on the back , if there are white burn marks they're definitely failing.

How Many miles are on your coils? The average usable life span of these coils is ~20K Miles.

Just stick with the stock coils. They can be found cheap (~100 for 4 brand new)

Pull the coil wire off at the distributor, put a screw driver into the end of coil wire and hold blade of screw driver between your thumb and index finger. If you are still holding onto the screw driver after having someone turn over the ignition switch YOU NEED A NEW COIL. However if your arm hurts all the way up to your shoulder and your hair is now curly and the screw driver went flying your coil is probably OK.

Hmm. I'm replacing mine and I am pretty sure they have been in the car since the factory; but I did buy my car sues so who knows. When I changed out my plugs, I pulled the coils to look at them and they have the rough white spots. After I saw that, I kinda assumed they were going so I order a new set. Then again it has been 50,000 miles; 30k of them are mine. I hope this helps with my performance like the plugs did.

Hopefully the UPS guys are coming tomorrow, with the wires as well.

Very interesting. I got a flashing CEL last Saturday after a spirited run in 3rd gear and brief pull in 4th. I granny shifted to 6th and as the car was gradually slowing down, the CEL quit flashing and went dark. I pulled over when it was safe a few minutes later, lifted the hood and checked things over.

About 10 minutes later, I tried a full throttle run in 2nd gear and didn't get past about 6k RPM; the engine just pooped out, and the CEL came on solid and stayed on.

So, I took the car in for service yesterday and got it back last evening. Verdict? Code P0302 rear rotor misfire. The technicians "swapped" the coil (not sure what that means, but my guess is they swapped position of 2 of the existing coils) and did the latest flash update. Car now runs great all the way to redline.

After reading the above comments, I'm concerned about the coils. My '04 only has 15k miles,

here's the spark plug DIY: https://www.rx8club.com/showthread.php?t=31872.html
I simply jack up the front left side, remove the front driver's side wheel and using a ratchet with an extension you can remove the spark plugs. (swivel end makes it easier)

You're only replacing one ignition coil?
Pop the hood, remove the engine cover
while looking at the center of the engine bay, look slightly to the right.
There you'll find the intake, it should have a rubber accordian attachment to it, I find it easier to get to the coils if i remove that. (a phillips head screwdriver is needed)

Now take your trusty ratchet and you can get to the coils. follow the spark plug wire to each coil and remove the nut holding it. change one at a time so you don't get the spark plug wires mixed up.

do all coils at the same time.

u can get all 4 for a bit over 100 bux.

u need a 10mm socket, extension bar and ratchet.

plugs, see diy

search is ur friend.

The dealership is charging $70 a piece for each Ignition Coil, $28 for cabin air filters, $47 or $31 a piece for the spark plugs but not sure which price goes for leading and trailing plugs.

I almost tripped when my service advisor said replacing my front pads along with new Rotors was going to hit a little over $500 with the service.

So I decided to start shopping for aftermarket parts and save some money. With the DIY info I hope to find on this site, I can probably save more money on the labor I was going to pay Mazda to install all this stuff for me. I'm only apprehensive to do it myself cause I'm not a grease monkey at all.

spark plugs and coils I actually don't buy them locally, I find that it's easier (and cheaper) to get them online.

www.finishlineperformance.com or www.onlinemazdaparts.com both carry them for great prices. (I've ordered from both; great vendors)

the prices the dealership quoted you are ridiculous! Ignition coils are like $25-$30 each. Spark plugs are under $100 for a full set.
Even if you're not very mechanically inclined, these are pretty simple to do on your own.

You can knock out the coils and splugs in an hour or two from home.

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