Hey,
Ive bought a rx8 231 2006 2 months ago. While i was doing the test drive there was no missfire. i checked the compression before buing the car and it was at Rotor 1: 8.1, 8.2, 8.2 Rotor 2: 8.2, 8.3, 8.2 (bar) with a rotory compression tester. When i got home the next Day I changed all the fluids (The car has a sohn adapter with castrol 2stroke oil and 10w40 mineral oil as engine oil) in the car. Then me and my friend did a test drive and we noticed that the car was missfiering all over the rew range. I thought it would not be bad to change the ignition system so i ordered and installed a full NGK ingnition system(plugs, wiers, coils). Then after the next test drive. There was no more random missfire code but the moment it hit 4500 rpm the car missfiered and i got the code for missfire on Rotor 1 but it still had the same performance and fealing how the other rx8 i test drived. i did the 20 break stomp a cople of times, switched over the injectors and coils/plugs from rotor 1 to rotor 2, checked the compression again (did not change from what i messured before), the car starts fast warm and cold, went to my mazda dealer to get a software update, Cleaned the maf and ess, removed the battery for like 1 day, i checked the ignition system with a ignition test light(dont know how to call it in English), Checked the car for exhaust gasses in Coolant(There are non), The car has no cat, i realy dont know what to do right now. I did get some logs that i incloud in this post.
Sorry for my bad english if you dont unterstand something please let me know.
Thanks in advance
Patrick

 

What brand of coils did you install recently? Mazda Revision C, Black Halo Racing (BHR Globally Compliant), Sakebomb are reliable. Others might lead to misfires.

 

I have NGK coils on the car. Tried mazda revison c comfirmed working from my friends car still same issue