Originally Posted by roflcopter

Awesome.

Mind if I ask what scanner you got?

If it can actually get logs of a full pull and you can get it in a graph view with a few different parameters that will help a lot, although the information taken from that will basically only tell us if we are in fact having the same problem, not what the problem is.

Originally Posted by wcs

mmmmmmmmmmm
Lets hope it does the trick.

Thanks for updating us.

IMO there's been some excellent discussion in this thread I would like to see how this all plays out.

Are you going to get Mazda to switch the A/F sensor or try and do it yourself?

Originally Posted by Jon316G

So RK, DeViLbOi, and myself met with Vyndictive today to troubleshoot this issue.
It ended up being a stuck SSV valve that caused this headache.
I'll explain how this went down:

1st thing I did was removed the intake accordion tube and found a nice puddle of oil residue.
I then opened the throttle body flap and stuck my finger in.
I could feel gritty oil all the way in (not to mention my finger was black).
After removing the throttle body I stuck my finger in and felt the same oily grit.

We removed the upper intake manifold and it was oily all the way through.
I could see the SSV valve had a nice build-up along the outside.
I tried to move the value using a hand vacuum pump attached to the actuator, but it wouldn't budge.
We sprayed Sea Foam down the intake passage and let it sit for a while, but that didn't help.
I ended up taking a flat-head screwdriver to the right side of the SSV lever (attaches the actuator shaft to the valve) and hit it with a mini sledge.
Once the lever started moving I could see the valve was slightly open, enough to stick a screwdriver down and pry at it.
I made sure to use a thick screwdriver because I didn't want it breaking in the intake passage.
But I was able to open it fully by using the intake housing to pry the valve.
It wouldn't close on its own, so I had to manually close it while spraying Sea Foam on the valve.
I tried to scrape off as much grit from the valve as possible and sprayed again with Sea Foam.
Once I worked it back an forth a few times I was able to use the hand pump to actuate the valve.
It would open and then slower close, so we kept on spraying Sea Foam in there and worked it back and forth.
After a while I was able to actuate it without it sticking.

We also decided to use Mazda's Engine Cleaner to spray into the intake maintenance ports following their instructions.
We cleaned the upper intake manifold, the throttle body, the accordion tube, and the MAF sensor.
I pulled his RB intake filter out and it looked fine.
After all that we reassembled everything and started the engine (to which we enjoyed the white smoke show).
After the engine warmed and the idle dropped to 880 RPM we revved it up and it returned to idle without any hesitations.
Feeling good about that we took it for a test drive and everything ran smooth.

Since we couldn't possibly remove all build-up I recommended to Vyn that he spray some Sea Foam through the throttle body every now and then just to help work the rest free (still won't be perfect, but can't hurt).
So I would recommend that anyone with idle issues, simply actuate the SSV valve (by hand or with a vacuum pump) and see if it moves.

Originally Posted by Harlan

Idle looks fine, 2500 rpm looks pretty normal. 5200 looks... well wrong. Open loop is because of load. Load is because of??? Have you messed with your ssv yet?

https://www.rx8club.com/australia-ne...closed-182041/
https://www.rx8club.com/trouble-shoo...alling-162200/


If this fixes it, make sure to routinely go above 6500rpm to get all the intake valves to actuate. If they don't get exercised routinely they can get stuck.

Originally Posted by Harlan

May not throw a code. It fits your symptoms and makes some sense. I'd just try to actuate it with a long handled screwdriver. I don't remember offhand what it takes to get to the actuator, but I don't think it's that much. I'll go out in a bit and find out for you.

Originally Posted by dannobre

What are your MAF g/s values at 5200 area? AFR values? Trims are adding a lot of fuel it appears.....more than would be considered normal

Originally Posted by Harlan

Barometric sensor, it's supposed to be like that.

Originally Posted by dannobre

What are your MAF g/s values at 5200 area? AFR values? Trims are adding a lot of fuel it appears.....more than would be considered normal

Originally Posted by Cliffjumper126

This scanner doesn't give me any readings for AFR, just fuel trims and some other stuff. It doesn't exactly work right, and I'm sending it back. I plan to get a bluetooth OBD2 thing to use instead. I did manage to get the MAF reading at 5200rpm: 8.0lb/min and 9.3lb/min

Originally Posted by Cliffjumper126

My scanner came in today and I just got back from an hour long session of driving around getting data. Here goes:

At Idle, 823ish rpm
1.) It says "Closed Loop, fault" (possibly says "fault" because rear 02 is unplugged?)
2.) Load Value: 33.9%
3.) STFT Bank 1 moves around anywhere from 0.0% to 0.7 to -0.7 then even to -5.4% at one point I think
4.) LTFT Bank 1 stays pretty much at 3.9%, was at 2.3 and 4.6% a couple of times
5.) Ignition Advance is -3.5deg to -4.0deg
6.) Throttle Position is 12.0%

At 2500rpm & 42mph
[SIZE=4][SIZE=4][SIZE=2][SIZE=2]1.)[SIZE=2] [SIZE=2]Mostly [SIZE=2]"closed loop[SIZE=2], fault", open loop a few times
[SIZE=2]2.) Load Value 10.9%
[SIZE=2]3.) STFT 6.2%, -2.3%
[SIZE=2]4.) LTFT 11.7%, 4.6%
[SIZE=2]A [SIZE=2]few times, both LTFT and STFT read 0.0%, probably when it was open loop

5200rpm (Beginning of power loss range in second gear) 39mph
1.) ALWAYS OPEN LOOP?!
2.) Load Value 60.5%
3.) STFT and LTFT are zero.

I'm not sure why it's deciding to go to open loop at about 4600rpm, or why that last load value is so high.

Originally Posted by Cliffjumper126

Ok, so I gathered more data this morning.

It's in Open Loop at idle for the first 15-20 sec after the car is started, sometimes "Open Loop, fault".
AT IDLE, STFT moves around between -1.5 and 1.5%, mainly 0.0% and 0.7% with occasional jumps to -2.3, -3.1%
LTFT was 4.6%, 5.4%, and 7.0%
MAF is reading 0.5 lb/min at IDLE
Anywhere above 5k is open loop.
Cruising in second at 5200rmp (Open Loop), STFT was at 17.1%, 18.7%
LTFT 5.4%

These numbers just don't seem right..so BUMP

Originally Posted by Harlan

5200 looks... well wrong. Open loop is because of load. Load is because of???

Originally Posted by Cliffjumper126

Google converted them for me since te scanner only gives those units

8.0 lb/min is 60.47 g/s
9.3 lb/min is 70.31 g/s

Originally Posted by wcs

edit: I'm busy at work ... I just skimmed the updates .. I'm not sure what I wrote even makes sense



Was is the Load so high? I don't know why do you think 60% load is high?

Healthy RX8 Maf g/s vs Calc Load







Agreed however,
Open Loop isn't just load (IMO), we have an Closed Loop Exit RPM of 6000 and a Closed Loop Exit Throttle based on RPM vs Throttle Duty Cycle.

I don't know how this device works but on the Cobb AP the STFT goes to 0% in OL

That being said chances you are in OL by 5200 rpm but not necessarily so.

Here is a good clip from RIWWP on Load
https://www.rx8club.com/rx-8-discuss...8/#post4418642

Another thing, if the Goog is telling me right 0.5 lb/min at idle is only 3.8 g/s and that my friend is pretty low.
However as Dan said lb/min is a pretty course measurement.



Seems a bit low to me but you need all the other parameters going on as well like Calc Load, Throttle Position, Gear, etc.

Dan?