Your Grams per sec on the MAF are high. But everything else looks ok.

 

But you also have a custom tune so that doesn't matter much.

 

Nice ninja edit, I was about to say... Thanks though.

Speaking of, reverting to the factory tune was mentioned earlier in this thread. Think its worth giving it a go?

 

I forgot your mod list was up top I don't think it's in the tune, but it can't hurt to try. Just switch to the Cobb "stock style"

 

I'm having a similar issue but the difference is that i got a flashing CEL and it cleared itself before i was able to properly stop.
This all happened at a stop light after i left the grocery store that i only popped into

 

That's a misfire. Period.

https://www.rx8club.com/series-i-tec...t-here-222280/

 

Thank you so much for that i was afraid it was something difficult to fix

 

I have this same problem on my 04 auto. City driving is nerve racking. Never knowing for sure if you can get out of your own way. Keep us posted on any progress.

 

Ya im having the same problem lol but hopefully a new exhaust and coils/ plugs will do the trick

 

Thanks for keeping us updated.
Interested in the diagnosis.

 

Looking at the datalogs, it seems ignition timing is staying rather conservative until the 4.5/5k rpm range, after which timing advances rather quickly. Could this be the knock sensor? Or just the tune?

EDIT for clairification:

I compared your log with a stock ECU ignition timing map (this is why I questioned the tune). What I noticed was how low your ignition timing numbers stay before reaching the rpm range where you get power back. I am wondering if the ECU is retarding timing after [incorrectly] detecting knock or I am just seeing a normal tune.

However, this doesn't explain how humidity is related, other than damp electronics. Not to mention, the lack of a CEL.

 

I've been quite busy lately and of course not had a chance to continue any real troubleshooting. Sorry guys, i'm still working on it.

However, its been hot the last few days but the humidity is way down and the cars been performing much better so I guess that's something.

I would be curious if anyone could corroborate/elaborate on what tpb7463 said though.

 

Alright. Insane humidity is back and with it my car can barely get moving if on a slight incline. Making an appointment for a compression test tomorrow and hopefully tearing into the UIM on Sunday.

I was so upset with the car today... Of course no other powerless thread I've read through in the past two hours matches mine. If only the AFR's were off or I had a CEL this would be so much easier but I can be WOT with NO power and apparently have perfect AFRs.... :-[

If only dealers weren't so incompetent and I could trust them to fix this with spending weeks and a fortune...

/ragerant

Posted From RX8Club.com Android App

 

UIM pulled and I tested every vacuum line I could find and they all hold vacuum. I can see the SSV cycling when shutting off the car so I know that's moving.

Fuel pressure still hasn't been tested but I'm going to wait until after my compression test that's scheduled for this Thursday.

Funny part? Humidity's back down and its running great. WTF!

 

Weird. Definitely check the fuel pump though.

 

rickeo, holler if you're in the West Chester or Pottstown area on a hot humid day.

 

I will. Life's kinda gotten in the way and a compression test at a dealer might have to wait a bit.

Thank's man.

 

Any updates?

 

I suppose this thread is the least of my worries.

https://www.rx8club.com/series-i-tro...-power-248105/