RotaryDrift1370

Hey guys i know that there is probably a thread out there for my question, but i dont have time to look around forever. I have a 2004 RX8 with 102,xxx ish miles. When i bought it from the guy he said that it would stall out well he was driving, he scanned the check engine light and found it was a random misfire (I scanned it myself and got the same thing). so i replaced plugs and wires. scanned and cleared code and CEL went away. Later started it up and found that it idles fine until it reaches operating then it stalls (everytime). However if i drive it and constantly give it gas it runs fun, no power lose. after it stalls out i can't start it till it cools down. I know that low compression is the cause but i compression tested it and it came out fine. I read that clearing the NVRAM can help with the misfire and stalling problem so i tried the 20 brake stomp. now here is my issue when i went to do it i turned the key to the on position (like you are supposed to) and stomped 20 times. now instead of the oil pressure gauge sweeping the CEL flashes.

What does that mean? The only code i get from the CEL is a U0155.

Any sort of help would be much appreciated!

RIWWP

iTrader: (2)

What were the compression numbers?

You should have gotten something like this in format, filling in with whatever 6 pressure numbers and your 1 or 2 RPM numbers:
If you didn't, then you didn't get a proper test done, and if you paid for a test, then you need to return to them to get the right numbers.

If this was done with an analog compression tester that you might pick up at an auto parts store, then read this post and the one after for why that won't work: New and Potential Owners Start Here: Compression Test

RotaryDrift1370

I don't have the numbers on me at the moment but i will get them later. What i am actually wondering about is the reset problem. What would cause the reset to fail? or what does it mean when the CEL flashes after i 20 stomps?

RIWWP

iTrader: (2)

I don't recall ever seeing that behavior discussed on the forum, but then once you reset the NVRAM, it's reset so I don't think i've heard of someone repeatedly trying to reset it.

RotaryDrift1370

I mentioned it at the end of my original post. and i understand that once its reset it is good but i cannot get it to reset. i read that after the last stomp the oil pressure gauge will sweep and come back to the middle. mine never did that the check engine light just flashed. so i just assumed it didn't work.

RIWWP

iTrader: (2)

Ah, you stated: " now instead of the oil pressure gauge sweeping the CEL flashes. "

Implying that it swept at least once, but then didn't sweep.


You just aren't on the latest ECU flash version then, the earliest 2004s didn't sweep the needle until their ECU was upgraded to the latest flash. There are a host of other improvements with the later flashes, so if you rebuild/replace the engine and want to keep it long term, definitely get the ECU updated to the latest flash.

This is assuming that you got all 20 stomps registered and in within the 8 second time period it's looking for. Without the needle sweeping, it's not easy to tell whether or not you got it.

RotaryDrift1370

ok thanks for the help. i will look into that and post the results.

Legot

iTrader: (1)

RIWWP is right, the most recent flashes solved some issues with oiling and startup/shutdown fuel injection. It's the reason some people flood daily and some people have never flooded.

Assuming your compression is fair, random misfires (p0300) are usually fuel supply, intake, or exhaust related since those are the big systems that are not unique between the two rotors.

The first steps would be to check your air filter for nastiness and to clean the MAF. Next would be to clean the ESS, which is the only shared ignition system part. Then pull off your catalytic converter amd check for clogs. Personally I think it's your fuel pump failing but since you're a new owner those are things that you need to check out first as they could be significant contributing factors.