Question about 2004 Mazda RX-8

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How to replace IG coil on Mazda RX 8 2004 - 2004 Mazda RX-8

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Alright, I agree there is no DIY for the coils, but it's really not that hard.

Here is some info,took me all of about 2 minutes. I didn't read it in depth either, but sounds like he got it right for the most part.

Task:
Let the car cool down! (Mine was already dead, so not a problem) & write down your radio stations.

1. Pull off battery cover - careful, it's easy to break the plastic clips holding it on.

2. Use 10mm socket and remove negative terminal.

3. Pull out air filter box - this is a pain. Literally. I jammed one of the metal lid-clips into my palm. You have to push the front of the filter box towards the windshield until the oval shaped opening in the front clears the receiver in the bumper. Lift up in the back of the box a little, near the accordion tube, then push hard from the front while exerting upward pressure. Search Youtube for "removal Rx8 air filter" for a sweet vid of the filter box removal.

4. Remove the 2 wire harnesses from the back of the filter box and push out the wire-guide clips - tuck them out of your way. (Guide-clips are kind of a pain, but you can press the clips from the back w/ the screwdriver)

5. Loosen the hose clamp on the front of the accordion tube (between filter box and accordion) w/ the Phillips head.

6. Pull the filter box forward and out of the accordion tube - twisting L & R gently helps.

7. Under the filter box, Detach the odd black canister thing w/ the small hoses from the brass bracket and let it hang there - it just pulls off the bracket.

8. Done w/ filter box - You can now rotate it over and set it on top of the battery.

9. Loosen the hose clamp on the back of the accordion tube (between the accordion and the throttle body) w/ the Phillips head. The tube can then be gently twisted off. I didn't detach any of the hoses, just pushed it aside.

10. The 4 coils are now exposed below the throttle body - you can see the top connections of the spark plug wires - they plug right into the coils.

11. Start from the front and work your way back: Pull off the spark plug wire - they don't come off easy. (Note on 2004 models, w/ the old coil design there's a extension piece w/ a spring in it that will come off and remain stuck on the plug wire. You must remove this from the plug wire - it will expose the standard plug wire tip - ie a male connector that will fit in the female coil receptacle - if you're replacing the plug wires as well, don't worry about this)(Also note, you can unplug all the plug wires, but only do this if you mark them and remember which one goes to which coil - detonation is bad! very bad!)

12. Unplug the wire harness/connector from the back of the coil - clip on type, use the 10mm ratchet/extension/u-joint and unscrew the one retaining bolt that holds the coil to the backing plate. (Mine were corroded as hell, but a little constant pressure was enough to break 'em free)

13. The coil can now be pulled out. The very front coil is trapped under some sort of hose/mount guide - I just flexed the hell out of it until the coil cleared the screw post. The back one is also a pain to access unless you have a child handy, and is what makes the u-joint for the ratchet essential.

14. All the coils are the same, so you can just apply a little dielectric grease to the screw post (optional), drop the new coil in, bolt it down tight, re-clip the connector on the back, and plug in the PROPER plug wire. Repeat 3 more times.
(Note: Wiring is as follows: Starting w/ coil @ front of car and working your way back to the windshield: Coil#1. Leading front rotor, 2. Trailing front rotor, 3. Leading rear rotor, 4. Trailing rear rotor. On each rotor, the the lower/bottom spark plug is leading, the upper/top plug is trailing. Make sure it's wired right!)

15. Now undo what you did in reverse order. Twisting helps to reinstall the accordion tube and filter box into one another. Re-tighten the Phillips screws on the hose clamps. Reattach the black thing under the air box to the brass bracket.

16. You have to push really hard to get the filter box back in. Try not to impale yourself/crush your thumbs; then, once it's in, pull the box forward to seat it.

17. Remember to re-connect the two wiring harnesses to the air filter box.

18. Reconnect the negative battery terminal. Screw it down and replace cover.

19. Put the key in and turn it to "on" - don't start it yet. Reset all the stuff you need to. The DSC light will flash, and the Traction light will come on solid - this means you need to recalibrate the steering sensor (happens after battery disconnect) - see owner's manual: turn wheel clockwise to lock, then counter-clockwise to lock, then center wheel, then turn key to "off," then turn it back to "on."

20. Then give 'er a spin. If you did it right, you might notice significant low-end torque improvements (I did) and a more rapid engine start. Maybe even some mpg gains (I'm hoping - since I'm getting 11.8mpg, all city - but I've been driving on bad coils for a while)

21. If no start - check all of your connections, harness @ coils, battery, plug wires, intake harnesses.

22. Ideally, you should also change/clean your plugs (and maybe wires) at this time since the plugs are likely fouled due to poor combustion/misfire.
- I literally did this @ the dealership parking lot in 25 minutes; Thanked them for their accommodation and proceeded to drive my car off and pocket the $272 I saved in parts and labor for just the coils. Hope this helps! __________________

Posted on Mar 12, 2011

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RX8 Spark Plugs and Wires Install guide
Also has some info about the RX8 coil packs, how to check the condition of them and where to buy some genuine Mazda RX8 coil packs for decent money.

Posted on Sep 27, 2011

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