CEL at high RPM
 

My car runs fine and doesn't have a CEL until I hit high RPMs. It flashes for a little bit then goes away. When the CEL starts flashing somewhere around 6-8k RPM my car has a hesitation and won't really go any faster. Is this a oxygen sensor problem or does my SSV need cleaning again ?

Missfire. Replace coild plugs and wires

This

Awesome, thanks guys for the fast response. I'll check my coils when my car gets out of the shop from getting the AC fixed finally.

Flashing cel is always a misfire.

www.rx8club.com/.../diy-testing-gm-ls2-yukon-coils-sparkplug-wires- 222641
Read this on how to test them. Simple resistance check with ohm meter on our HEI systems is is not a true gauge. Especially considering the area of 6k+ rpms. Thanks Team for the write up and all who contributed

Misfire. Do the basics: plugs, wires, coils.

Also do the 20 stomp on the brake to clear it from the memory or it will continue to recall it even if you have fixed the problem. Clean your MAF and ESS too before you clear the memory as a dirty MAF can make this hapen I know it hapened to me at those RPMs and that was the cause. One more thing after clearing the memory it can and will stall out this is normal you just need to take it out for a long gentle cruse it'll run a litte ruff too that's normal as well the ECM has to learn the engine all over again but this will ensure no false recall of the misfire.

Thanks again guys !

but a misfire is not always ignition related, just fyi ...

^^^haha. Although I'm not French, I think this warrants,"touche" Good point

I think I know what you're saying, but wouldn't it be more accurate to say "Bad ignition components don't always cause misfires."?
It's semantics, but isn't the term "misfire" inherently
"ignition related" , i.e. failure of any ignition component to fire, even though it's other forces that cause misfires, as in low compression, clogged cats, etc.?

I think someone else is going to have to chime in on this 1. I'm really new to the rotary engine & don't know how the computer would react to these situations such as low compression/fuel pressure,timing,etc... In a conventional piston engine, things of this nature would definitely set off a code. IMO I think the way Team addresses this would be more politically correct(again I could be wrong) but saying, " bad ignition components don't always cause misfires" sits uneasy w me. Bad ignition components DO always cause misfires. Now a component on its way out, not performing to full potential, will not always cause misfire, or CEL. YES, the source of the problem could easily be contributed from elsewhere other the the ignition components, but again, I'm not sure how the rx8's computer reacts to these instances... Anybody?
( hope I'm reading and understanding your post correctly BC)

Yes, I have worded it poorly, it sounded right in my head at the time.:)
I meant to say "Misfires aren't always caused by bad ignition components."

I believe that makes more sense.

I know this feeling on many, many occasions :)

flashing cel is a misfire however it can also be a clogged cat choking the engine. I replaced all my ignition components and still got a flashing cel at high rpm and turned out to be the cat.

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It can be a dirty ESS or MAF too had personal experience with both those pulling a misfire.

Yes, my experience also, and I'm sure many others have been through it.
It's kind of a yin & yang thing, ignition components fail initially, ruining the cat. Replacing the ignition parts without replacing the cat with another, or a midpipe, or gutting it;
OR replacing the cat and not the ignition parts, still results in a flashing CEL.
I was still learning about the Renesis when I fixed mine.
I replaced the ignition with the same results, then parked it until I could get my BHR midpipe installed.
After that, no more flashing CEL.
13k miles, 16 months since then with no issues.(except pesky PO420 code, cleared with the Android Torque app.)
I have been driving for a week with a new Walker direct fit cat.
I'm getting an inspection next week, and will remove the cat again next weekend if I pass.
I am curious to see what it looks like after only 2 weeks & around 350 miles.