I have some related questions to my spark plugs and coils and other things. My 07' manual 6speed RX8 recently started loosing power when I was shifting in the low gears so from 1st to 3rd my car felt like it was trying to "pull", per say, a very heavy load. After 3rd, it leveled out alright but still noticable diffrence in power. To add to this, my engine is making a harder, more throatier sound whenever I apply the gas. It is also rather a b***h to cold start the car. I have no clue since the last time my ignition coils were replaced but the battery is brand spanking new. A fellow poster suggested that I replace my Ignition coils, plug wires and plugs (Im still confused by plugs, meaning spark plugs or some other type of plugs?). Do you agree with this? Any other things I should do? and what specific type of Items am I going to need to replace the coils, plugs, and wires?

 

I am going to go with the Black Halo Racing ignition BHR Ignition System | Black Halo Racing once I get the cash, its pricey but I haven't heard anyone that didn't recommend it as an upgrade for the RX.

 

the ignition systems are a weak point in these cars, so unless you have service records its not a bad idea to replace everything.

i personally like the OEM parts, although you should shop around.

if you want to go the inexpensive way, the plug wires can be checked with a multimeter, they should be between 1K-4K ohm's of resistance, and they should securely stay on the spark plug.

the coils can be checked with a timing light. if you have 1 bad one, and don't find a bad plug wire, or plug, then it might just be best to replace all four. keep the other 3, they might be handy later.

there is a check in the book for the plugs, but they should just be replaced

 

Thank you j9fd3s, that was extremely helpful!

 

for about 100 bux, u can get all 4 coils with lifetime warranty. i dont see why not?

as for spark plugs, it can be had for less thab 60 for all 4, again, i dont see why not?

a set of ngk leads cost like 20 bux. replace it if u dont know the history of the car

 

nycgps, where can I find them that cheap?!

 

I believe auto zone/advance autoparts run the deal for the coils. Check there. Other places you might want to look is mazmart (they have a combo deal for $315).

 

i bought the BWD coils for $28 each at pep boys. the coils are aftermarket, but since the the OEM coils aren't that great, i figured it was worth it.

pep boys also lost them the first two times they ordered it.

 

If you can check your ecu codes, look for misfires. I had this recently, and your description of how your car is running sounds very close to what mine was doing. Turns out that my spark plugs were in terrible shape.

I replaced the ignition coils, spark plugs, & wires with parts from advance auto. It cost around $220 shipped with their Black Friday discount. The car now runs great. It is also getting about 3 mpg better than before and drives better overall.


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Mine was the exact same thing, seemed sluggish, and harsher throatier sound. Turns out my cat was dead, plugs were fouled, and plug wires were corroded. I had replaced the plugs only 20K ago. Ended up replacing plugs, wires, cat, and a decarb of the engine. Now it's like a new car!! Amazingly smooth, sounds normal, and all the power is back.