CEL, fixed spark plugs, now CEL is back
 

Damn it, I thought the dealership fixed it. I had a CEL weeks ago and dealership told me it was fouled plugs, so they replaced it with hot plugs for free under TSB.

I thought they fixed it, coz afterwards the low rpm power was noticeably there. And to make things better, I was getting 17-18 MPG for the past few tanks (compared to 15-16 MPG and rough idle). Now as I was stopping from a 30-min freeway drive, CEL bumps up!

I read the codes with my CANscan and this is what I get:

Vehicle Reports 1 Stored Trouble Code(s)
TC1 -P0301
P0301 Cylinder 1 Misfire Detected
Pending Code 1 -P0003--P0003 Fuel Volume Regulator Control Circuit Low
Pending Code 2 -P0100--P0100 Mass or Volume Air Flow Circuit Malfunction

...which is by the way exactly the same codes I received before!

ps. Last Sunday my car hesitated to go beyond 7,000 rpm on my 1st gear blip. It felt like it had hit a rev limiter bouncing up and down like a maniac. Is it the weather? WTF!

Here's the sheet on P0301. No info in the shop manual on the Pending Codes.

I think I may have found the problem, your RX-8 has cylinders :D

Hey man.. This is exactly what I am going through. They actually voided my warranty when it came down to it because they thought that one of my aftermarket parts was causing the problem. I am in the middle of trying to find a lawyer or contact SEMA for mroe assistance.

I have been having this issue every since my 30k service where my injectors were flushed. I suddenly smelled fuel and could barely even drive in the car. I am still having the CEL issue and it's been on for the past 6 months (or more)...

I am fed up with it and have been trying to find a lawyer. My car is practically back to stock and the light is still on. Obviously it wasnt anythign that I had done and it's not right that they voided my entire warranty...

The only code I have is a P0301 just like you....

My brother.. haha :)

Sucks huh??? I am giong to contact SEMA soon and hopefully they can point me in the right direction. I dont want to be nice with them anymore so I am hoping that they can suggest a lawyer to me....

Forgot to mention that I also have a CANScan and I am getting the P0100 as well...

Are you sure you didnt steal my car? :) Did you have you 30k service done? What mods do you have? The only mod that is on my car right now is flywheel and clutch... thats it....

I don't have mods in my car and yes it is Red, but no 30K service yet, I only have around 18K.

Changes made are painted calipers, added mud guards, clear corners and hardwired radar det. I have suspension mods waiting, but I don't want Mazda to wash their hands and say it is my fault so I'm trying to stay away from changing anything major for now.

yep, I'm still trying to figure out where my cylinders are :eek:

Is your car at the dealership now?

no, not yet. I have to call them.

Well good luck man. Mine ended up at Mazda Irvine R&D and they woudlnt work on it because of my aftermarket parts. Rrrrrrr

I had this problem at 12K and new plugs fixed it since. I hope to God they find out whats wrong on your 8 because I surely dont want to go thru that again to find out new plugs aint the answer..

GOOD LUCK!

I unplugged my batteries and after plugging them back in, I reset the PCM with the brake taps. Everything seems to be running much smoother and stronger now. I have been pushing the car since then and no CEL yet. Only lots of chirps when I shift :D

Hmmm.. I'll have to try this.. I havent yet :)

I have an 04 rx8 with 65000 miles and I went to the dealer and they changed a air pump that they said it failed and they looked over my car and told me everything was running fine. the cel was off and when i got on the road home the light came on again. $750.00 later and not fixed. any help here? I am not sure what i have to do. I do not have any mods on my car.