Tried to title as informatively as possible, and I have also searched.
2004 Rx8 6MT 100,700 miles, third owner. New plugs a week ago. Moroso wires installed about two years ago. Brand new IDI (Oreilly Auto brand(BWD/Intermotor) coils changed about a week ago. Intake setup is custom, has worked no serious issues, for years. New remanufactured MAF by A1 changed about a week ago.

Here's the issue. About a few weeks ago I lost power on the highway, made it home safe though. And since then, this is what I've found. CEL on P0113 IAT High Input Ckt. I could not rev passed 3k, but felt normal below, and car can get up to highway speeds but it takes forever. So I cleared the code and changed the mentioned parts.

Power came back, for a few days only though. Then same thing. But I noticed something I hadn't before, I have the Emergency Brake Light, ABS Light, SRS and Airbag Light and both traction control lights all on along with the CEL.

Now, whenever I clear the code, I can drive the car a few blocks just fine, I have all the power and response as normal. BUT the CEL always comes back and the moment it does, the very moment, is when I lose the power and cannot rev above 3k. So basically my car goes into "limp mode".

Weird thing is that even when the CEL comes on, I get no code, it's allways "System Pass No Faults Detected". But I do see under datastream mode MIL Status:ON. But no code. Mazda only code? I really don't think so.

Today I took out the battery tray and pcm and airbox tray to hunt down some bad grounds. Cleaned some connecters, installed new battery terminals on a new battery. Have done both pcm reset procedures multiple times; the NVRAM and the KAV(sp?). Still, same problem.

I can only think, bad PCM? MAF sensor harness? If so, would this be something Racing Beat could fix with their 300$ tune? WOW this is blowing my mind and I don't know enough to diagnose myself so will eventually go to dealer but figure you guys would know best.

 

You know what guys, I haven't tried searching "Limp Mode" didn't think of that until making post. Wish me luck!

 

Bump? At least if not to answer my questions, would anyone like to share experiences having PCM service done? And btw I am currently reading about MOP...

 

you ever get it fixed?? im having a problem like this now :/