See another problem is that the issue occurs only under load. Not when the cars idling.

 

Same with my issue, I've swapped my injectors around on the secondary rail and couldn't get the issue to change. I had one oring about to go that I replaced but nothing fixed it.

I think the CmdPrge thing is the commanded purge percentage for the Evan system, which shouldn't cause any issues either.

 

Check the feed line on your fuel pump.... My friend noticed a fuel smell while i was under the car putting my cat back on so I pulled the back seat off and noticed that the line going from the Fp housing might have been leaking.... I'm not 100% sure about that though. It could have been from a long time ago or the last time I drove.

Ps with multiple people having the same or similar issue I can't believe no one will chime in on this.


Also I do not believe that fuel smell should have been coming from that region with the sealed cover over it.

 

I replaced my fuel pump with a Walbro after my issue started because I thought it might be the issue, and everything was in good order at that time.

On the note of smells, my car gets quite the oily smell to it on occasion, but I have no excess consumption and no leaking anywhere, food for thought though.

 

Hmmm interesting. O btw I took the Subaru drive by wire throttle body apart and looked at how it works... Really it's not complicated.... Its really cheesy. If your interested I can post a pic or two. It's really similar to the design I the rx8's tb

I'm sorry to say but Im 100% my throttle body isn't the problem. I hate to admit I'm wrong. after looking at the internals I saw that the throttle position sensors would have to lose magnetism to mess up. The servo/stepper motor is linked to them via a gear there is two magnates 180 degrees of each other. That turn as the stepper motor turns. The only thing that could go wrong with it is the servo or the magnets

 

A costly misdiagnose. I jumped the gun due to the issues I had previously with the forester. They where so similar. The only difference was the rpm range that it occurred 2k to 5k rpm.

 

So does mine!

 

You mentioned a noise that was occurring that you believed was tied into your problem was well?

And as far as the oil smell goes, mine is usually immediately after backing off after one of the cars episodes. But only does it occasionally, most noticeable when sitting at a stop light. It's not a burnt oil smell, more just really oily gas, kind of like what a 2 stroke smells like.

I'm definitely not leaking oil, and my consumption is pretty average which leads me away from an internal oil failure or an OMP malfunction, unless it's only occurring at high load.

 

I have similar issues at the moment.

Low power at 5.5K and up.
Have never pushyed it higher though through fear of something going bang.
My CAT had collapsed so I gutted it and replaced earlier today.
Still lagging on power above 5.5K in all gears and accompanied by a odd sound. Somthing similar to that of when you were a kid and jammed a tin can on the back wheel of your bike.
I have no CEL
When she hits 5.5K - 6K its like she is sucking in gallons of air, so much so she 'coughs' a tiny little bit.(of knocks) Revs will go up but no real power there.

No problems at idle but she is rough when driving
I did have a P0120 code (Throttle / pedal switch sensor malfunction) but it has cleared itself.

Problem is get worse when warm and i getting worse with every driving cycle

Reading your thread 'power loss = me stumped' has given me alot to go on but im not sure were to start.

fron / rear o2 sensor?
SSV sticking?
TB bad?

I only have basic tools - so testing and stuff is difficult. PLus its my only car.

HELP!!!

 

The fact that you got a p0120 is odd I guess you went to a auto parts store and had them scan it? That code doesn't show up in our manual. I saw a post about this once. And the kid took it to the dealer and the pending code was p0207 I think which ever was the ssv issue. It just needed to get cleaned

 

Yes i believe the noise is directly related.

 

Would you mind describing more about the noise? Like what it sounds like, when it occurs, how it changes as you change inputs, stuff like that.

 

The noise only occurs as the issue occurs. To me it sounds like miac to me, but everyone else said it sounds like a heat shield. So I checked for a loose heat shield but none are. The issue and noise start at 5k up to redline. Nothing changes and the issue would happen at part or full throttle.

 

I noticed a noise pop up in my car a while ago and I chalked it up to the MIAC thing, it does it more prevalently at low rpm but that could just be my exhaust drowning it out up top.

I feel like mine is coming more from the passenger side though. Only does it under load, I've never gotten it to do it just sitting in the driveway.

 

that's not the same exact thing here mines from the driver side....and the noise only happens when the cars issue arises starting at 4 to 5k. since my data logging device finally came in. all i have to wait on now is the gaskets so i can put the car back together. i really need to watch my long and short term fueling and ignition timing. along with the maf scaling

 

Wow no one has any input

 

The last thing i had to test on the car was the injectors. I took them to a local fuel injector tester and watched them do the service. All six were perfect. So I'm at a loss here.

I have tested:

ESS POSTION
ECT
KNOCK
COILS
SSV
VDI
INJECTORS (BOTH SETS)

Things i have replaced:

THROTTLE BODY
SPARK PLUGS
SPARK PLUG WIRES

I cleaned the SSV and ports and the VDI

The issue started at 4500 to 5500 and continued to red line (ONLY UNDER LOAD). The problem was intermittent. It had a power loss and strange noise. (rattle, Maybe?)

I also had some serious corrosion on the main power lead from battery to starter and fuse box. So i rebuilt the harness.

The only issue is if i fixed the problem, I will have no clue what did it.

The only thing i have to check left is the fuel lines.

 

Sorry I haven't been posting and haven't called yet, life has been quite busy. I'm glad you got your injectors tested because that's one thing I have been toying around with the idea of being bad on mine.

You said you now have the ability to datalog? Could you get a pull in second gear from a low rpm at WOT and pinpoint what is happening to your MAF, calc Load, STFT, and AFR during that run?

I want some conclusive data that we are having the same issue before throwing too many ideas at you to try, I've covered a lot of it with my car but it's worth a shot for you to try it too.

 

So the problem is still there although the noise is gone...!?!

I'm thinking fuel pressure????? maybe....I have a tester but no connectors for the rx8.

 

I'm not gonna say I told you so, but I didn't figure they were connected.

There's a procedure for testing fuel pressure in the shop manual, go to foxed.ca and download that one.

 

I ordered the aeromotive fitting too


Yeah yeah yeah i know you did....I WAS WRONG!!!!

 

holy crap that manual is way better than the one i was working with!!!!

 

I'm gonna go ahead and say that fuel pressure doesn't add up to me but more data is never a bad thing.

 

I just got off the phone with a tech, he stated the most common problems with this type of issues is 1. fueling system 2. exhaust 3. vacuum......He stated that a visual inspection of the cat is more than likely to be inconclusive. He also stated to unhook the cat altogether and drive it. But you don't have a cat so this is inconclusive anyways. what about the FPR? it is in the tank? and i think the fuel pump system has a variable speed relay too. hopefully my son will be here soon so i can go to the shop and have someone help me data log.

 

AHH I forgot you said your data stated that the fueling was pig rich.....S***