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What I assume is "limp mode" issue

20K views 97 replies 12 participants last post by  Calvinball 
#1 · (Edited)
What I assume is "limp mode" issue. Not solved info in post #1

Ok nothing is solved so let's start fresh.

*new info* Car runs like a champ with MAF unplugged, issues are only with MAF plugged in. MAF and ECM have been replaced, original ECM is back in the car as it saves me $$$

It HAS to be something the MAF is affecting but I can not for the life of me figure out what it is...

Subaru had the car for 3 weeks and the only idea the tech line gave them that they didn't try was oil control valves. *new info*


Ok long story short I flashed Cobb stage 1 and this arose, tried many things and the issue remains.

Car runs perfectly up to 4500 rpm then it just hits a wall, feels like fuel cut or hitting the rev limiter.

2006 wrx tr

I have tried flashing stock map, flashing stage 1 again, completely removed the AP from my ecu.

New plugs
New fuel pump
New fuel filter
New bcs
New MAF
New battery
New MAP sensor
New front O2


Disconnected battery for 12+ hours.
No vacuum leaks of any kind.
Not one CEL.
The problem persists unchanged.

Any ideas from folks wiser than myself?
 
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#2 ·
Well the first thing I would have done was flash the ECU back to stock and if the issue remained. Just changing parts willy-nilly gets expensive when it doesn't solve the problem. Or learn to use the datalogger for the AP. It's a very usefull tool. You could have called Cobb about the issue and sent them a datalog to look at and see if the actual map was causing the issue. My guess is you hit a boost cut.
 
#3 · (Edited)
I appreciate you responding.

This has gone on for about 2 weeks.

Well they were things I intended to change anyway as I'm near 75k miles. I can't do any sort of logging with my V1 unfortunately.

What else would cause me to hit a boost cut just from a simple flash and then have the problem remain at the same rpm every time whether stock or stage 1?

I'm willing to check out anything that may be the problem.
 
#4 ·
Wow, so you flashed to Stage 1 and the issue started. Then you went back to the stock map and it's still a problem?

While reading my gut told me to think about fuel pump, plugs, and injectors. Since you've changed the first 2 already, maybe it's clogged fuel injectors? A guess could be that when you went Stage 1 and they started flowing more, something went awry and hosed one or more of them. At 75k miles it's not out of the question for them to become problematic. If they are the problem this could have had nothing to do with the AP flash, but rather just the result of some really bad gas.

Really, the best thing to do would be to find someone local with a data logger (AP or a laptop+tactrix cable) to see what's going on. If the AFR is out of whack then I might be onto something with the injectors.
 
#13 ·
Dead cell in battery. Have it tested.

Also check all your connections at the battery and starter to make sure they are not corroded or green rotted.

Also could be the wastegate acutator arm. Cobb has info on their website about adjusting it, or Donkey is the man with the td04
 
#11 ·
Do you just have a stutter around 4500 or can you actually not rev past 4500? I'm guessing the former.

What's your elevation? I'm only at 3600' but the Cobb maps weren't the best option for boost stability. Custom tune and all was much, much.....much...better.

Just caught your stalling issue; sounds like a pre turbo intake leak, or MAF issue. For starters check that your airbox is sealed properly and clean your MAF, inspect the wiring, etc...
 
#15 ·
Well luckily those codes have a relatively finite number of causes/solutions compared to others. I'd definitely recommend properly diagnosing each possible cause however. A bad primary O2 will definitely put you into limp as will a potential intake leak.
 
#16 ·
I agree on the O2 sensor, but since I had unplugged it ~6 hours before that I'm gonna give it a few drives and see if it disappears.

I've searched for leaks 3 or 4 times now and I can't find a single thing.

If nothing else I'll just go put it through the dealership's window and leave it in someone's office.
 
#22 · (Edited)
Holy hell, on my way home just now it happened again ~3k rpm and it felt like I got punched in the stomach. Then it puttered for 5 or 10 seconds and went back to the way it's been the last few weeks.

Got another CEL but I was almost home so I'll get that checked tomorrow.

Guess that's what I get for divorcing the AP and my car.

No cluster light for the parking brake either. She's falling apart lol
 
#23 ·
If you're getting seamingly random electrical issues, to me it sounds like an O2 sensor or sensor fuse or something.

It also reminds me of when I installed an UICP on my last Evo...it had slipped off and the car went nuts. The only way I could really limp back to the garage was to unplug the MAF. The car wasn't normal but it was driveable.

When you used the AP, you did unplug the 2 green cables when you were done right? Any chance you pulled too hard or something?

But given that you're having worse and worse symptoms I would just bite the bullet and take it to a shop or even a dealer to have them figure it out.
 
#35 · (Edited)
Both are 2nd gear.

Half throttle


Code:
Time,A/F Correction #3 (32-bit ECU) (%),A/F Learning #3 (%),A/F Sensor #1 (AFR),Engine Load (Calculated) (g/rev),Engine Speed (rpm),Ignition Total Timing (degrees),Injector Duty Cycle (%),Knock Correction Advance (degrees),Manifold Relative Pressure (Corrected) (psi),Primary Wastegate Duty Cycle (%),Throttle Opening Angle (%),Vehicle Speed (mph)
0,-1.33,0.00,14.01,0.52,2334,51.50,4.93,0.50,-5.66,0.00,12.94,22
203,-0.70,0.00,13.90,0.52,2369,52.00,5.00,0.50,-5.80,0.00,12.94,22
406,-0.47,0.00,14.01,0.52,2404,51.50,5.08,0.50,-5.66,0.00,13.33,22
609,-0.08,0.00,14.13,0.62,2440,48.50,6.19,1.00,-5.22,0.00,14.90,22
812,1.64,0.00,13.78,0.73,2464,43.50,6.30,2.00,-4.35,0.00,16.86,24
1015,2.03,0.00,13.55,0.83,2530,39.00,7.55,2.50,-3.63,0.00,18.43,24
1219,2.03,0.00,13.90,0.87,2561,37.50,8.19,2.00,-3.48,0.00,19.22,24
1422,1.88,0.00,13.78,0.94,2637,36.00,8.36,2.00,-3.34,0.00,18.82,24
1625,1.41,0.00,13.44,0.94,2705,36.00,8.00,2.00,-3.34,0.00,19.22,25
1828,0.94,0.00,13.90,0.91,2741,35.50,8.76,2.00,-3.19,0.00,19.22,25
2031,0.55,0.00,14.01,0.92,2818,36.50,8.40,2.50,-3.19,0.00,19.22,25
2234,0.39,0.00,14.01,0.91,2853,36.50,8.49,2.00,-3.19,0.00,18.82,26
2422,0.31,0.00,14.24,0.91,2930,37.00,8.74,2.00,-3.19,0.00,19.22,26
2625,0.31,0.00,14.01,0.92,2983,37.00,8.90,2.00,-3.19,0.00,19.22,28
2828,0.39,0.00,13.55,0.93,3041,37.50,9.06,2.00,-3.19,0.00,19.22,28
3031,0.55,0.00,12.98,0.90,3068,38.00,9.15,2.00,-3.19,0.00,18.82,29
3234,1.09,0.00,12.52,0.87,3147,38.50,10.05,2.00,-3.19,0.00,19.22,29
3437,1.09,0.00,12.17,0.87,3170,38.50,10.13,2.00,-3.34,0.00,19.22,29
3640,1.02,0.00,11.60,0.86,3246,39.00,10.29,2.00,-3.48,0.00,19.22,30
3844,0.70,0.00,11.14,0.87,3290,39.00,10.52,1.50,-3.48,0.00,19.22,30
4031,0.70,0.00,11.02,0.87,3338,39.00,10.58,1.50,-3.63,0.00,19.22,31
4234,0.47,0.00,11.14,0.85,3351,39.50,10.72,1.50,-3.63,0.00,19.22,31
4437,0.47,0.00,11.02,0.90,3428,39.00,11.69,1.50,-3.48,0.00,19.61,32
4640,0.39,0.00,11.02,0.91,3440,38.50,11.73,1.50,-3.48,0.00,20.00,32
4844,0.39,0.00,11.02,0.90,3519,38.50,12.00,1.50,-3.34,0.00,20.39,32
5047,0.47,0.00,11.02,0.92,3566,38.00,12.15,1.00,-3.34,0.00,20.39,34
5250,0.47,0.00,11.02,0.90,3612,38.00,12.31,1.00,-3.48,0.00,20.39,34
5453,0.47,0.00,11.02,0.91,3656,38.00,12.47,1.00,-3.48,0.00,20.39,35
5640,0.39,0.00,11.02,0.91,3672,38.00,12.51,1.50,-3.48,0.00,20.78,35
5844,0.39,0.00,11.02,0.91,3748,38.00,12.78,1.50,-3.48,0.00,20.78,36
6047,0.39,0.00,11.02,0.93,3759,37.50,12.83,1.50,-3.63,0.00,20.78,36
6250,0.39,0.00,11.02,0.89,3834,38.00,13.07,1.50,-3.77,0.00,20.78,36
6453,0.39,0.00,11.02,0.88,3877,38.00,13.22,1.50,-3.63,0.00,20.78,37
6656,0.39,0.00,11.02,0.87,3920,38.00,12.53,1.50,-3.77,0.00,20.78,37
6859,0.31,0.00,11.02,0.90,3924,37.50,13.39,1.50,-3.77,0.00,20.78,38
7062,0.47,0.00,11.02,0.90,3966,38.00,12.68,1.50,-3.77,0.00,21.18,38
7265,0.39,0.00,11.02,0.90,4013,37.50,13.68,2.00,-3.92,0.00,21.18,39
7469,0.39,0.00,11.02,0.91,4086,37.50,13.94,1.50,-3.77,0.00,21.18,39
7672,0.47,0.00,11.02,0.87,4127,38.00,13.19,1.50,-3.92,0.00,21.18,39
7875,0.39,0.00,11.14,0.87,4164,37.50,14.09,1.50,-4.06,0.00,21.18,40
8078,0.39,0.00,11.25,0.90,4204,38.00,13.32,1.50,-3.92,0.00,21.57,40
8281,0.39,0.00,11.25,0.89,4245,38.00,13.45,1.50,-4.06,0.00,21.57,41
8469,0.31,0.00,11.37,0.90,4248,37.50,14.60,2.00,-4.06,0.00,21.57,41
8672,0.39,0.00,11.14,0.89,4285,38.00,14.60,1.50,-4.06,0.00,21.57,42
8875,0.39,0.00,11.02,0.90,4337,37.50,19.44,1.50,-3.92,0.00,21.96,42
9078,0.39,0.00,11.02,0.92,4304,36.00,20.27,2.50,-3.63,0.00,22.35,42
9281,0.39,0.00,11.02,0.91,4306,36.50,20.60,2.00,-3.63,0.00,22.75,43
9484,0.39,0.00,11.02,0.91,4376,36.50,20.28,2.00,-3.48,0.00,22.75,43
9687,0.39,0.00,11.02,0.91,4378,37.00,20.51,2.00,-3.63,0.00,22.75,43
9890,0.39,0.00,11.02,0.91,4430,37.00,20.71,2.00,-3.63,0.00,22.75,43
10094,0.39,0.00,11.02,0.92,4358,36.50,20.34,2.00,-3.77,0.00,22.35,44
10281,0.39,0.00,11.02,0.87,4390,38.00,19.64,1.50,-3.92,0.00,21.96,44
10484,0.39,0.00,11.02,0.81,4339,40.00,17.56,1.00,-4.50,0.00,20.00,44
10687,-0.39,0.00,11.02,0.66,4474,44.50,15.13,1.50,-5.95,0.00,18.04,43
10890,2.03,0.00,11.02,0.26,4192,48.50,7.15,0.00,-8.27,0.00,9.02,43
Full throttle

Code:
Time,A/F Correction #3 (32-bit ECU) (%),A/F Learning #3 (%),A/F Sensor #1 (AFR),Engine Load (Calculated) (g/rev),Engine Speed (rpm),Ignition Total Timing (degrees),Injector Duty Cycle (%),Knock Correction Advance (degrees),Manifold Relative Pressure (Corrected) (psi),Primary Wastegate Duty Cycle (%),Throttle Opening Angle (%),Vehicle Speed (mph)
0,0.23,0.00,14.93,0.20,2020,48.50,2.57,0.00,-9.29,0.00,5.49,21
203,0.31,0.00,14.81,0.20,2014,48.50,2.99,0.00,-9.43,0.00,6.67,21
406,0.31,0.00,14.70,0.41,2042,54.50,4.37,0.00,-7.84,0.00,12.94,21
609,0.16,0.00,12.86,0.99,2010,36.00,8.10,3.00,-3.48,0.00,22.75,21
813,2.03,0.00,11.71,1.33,2026,18.00,9.99,2.00,0.15,12.55,100.00,21
1016,2.03,0.00,11.02,1.40,2118,15.50,10.95,3.00,0.87,12.55,100.00,21
1203,1.02,0.00,11.02,1.50,2244,12.50,11.91,3.50,1.89,12.55,100.00,21
1406,0.70,0.00,11.02,1.61,2344,10.00,13.47,3.00,2.90,12.55,100.00,21
1609,0.55,0.00,11.02,1.77,2461,10.00,15.15,3.00,4.21,13.33,100.00,22
1813,0.55,0.00,11.02,1.87,2559,10.00,17.05,3.00,5.51,14.12,100.00,22
2016,0.55,0.00,11.02,1.96,2692,10.00,18.89,3.00,6.53,14.90,100.00,22
2219,0.55,0.00,11.02,2.11,2811,10.00,20.49,3.00,7.25,16.08,100.00,24
2422,0.47,0.00,11.02,2.17,2946,10.00,21.30,3.00,7.84,17.65,100.00,24
2625,0.47,0.00,11.02,2.14,3078,10.00,22.89,3.00,7.98,18.82,100.00,26
2828,0.47,0.00,11.02,2.25,3228,10.00,24.00,3.00,8.13,20.78,100.00,26
3016,0.55,0.00,11.02,2.34,3352,10.00,26.20,3.00,8.42,26.67,100.00,26
3219,0.55,0.00,11.02,2.47,3467,10.00,29.51,3.00,9.14,30.98,100.00,29
3422,0.55,0.00,11.02,2.68,3600,10.00,32.91,3.00,10.01,35.29,100.00,29
3625,0.70,0.00,11.02,2.74,3786,10.00,36.06,3.00,10.74,36.08,100.00,32
3828,0.70,0.00,11.02,2.80,3923,10.00,39.25,3.00,11.03,35.29,100.00,32
4031,0.70,0.00,11.02,2.73,4047,10.00,40.42,3.00,10.88,34.90,100.00,35
4234,0.70,0.00,11.02,2.69,4168,10.00,41.99,3.00,10.74,36.47,100.00,35
4438,0.70,0.00,11.02,2.78,3931,10.00,62.82,3.00,10.45,35.29,100.00,35
4641,0.70,0.00,11.83,1.81,4166,17.00,44.85,3.00,5.80,39.22,100.00,39
4844,0.70,0.00,13.78,1.01,4002,26.50,19.63,3.00,-2.03,0.00,12.16,39
5031,1.80,0.00,13.32,0.21,3728,24.00,2.39,0.00,-7.69,0.00,9.80,40
5234,1.72,0.00,12.52,0.21,3560,24.00,2.30,0.00,-8.71,0.00,9.02,40
 
#36 · (Edited)
In my quest to locate a home for my lone plug, I came across this little guy.



It was "plugged in" to the back of slot "D" which is the one farthest from the steering wheel when the dash is on properly.



Seems slot "B" was also used for something, no idea what. There's quite a few what I would assume are extra ground wires used for something at one point but most of them are cut now.

Anything else I can check?

Oh there's a black wire and a yellow wire coming from somewhere above the steering wheel, they're both capped... someone messed this car up.
 
#37 ·
Ok here's more.

Dealership said they tried a MAF off another '06 wrx and "it ran perfectly" Still not working for me, even with a borrowed MAF known to work.

Half throttle

https://spreadsheets.google.com/ccc?key=0AnK3z4PDhXH-dElNLXBVNngtWEpjbmpoYjhWN0NJMkE&hl=en#gid=0

Full throttle

https://spreadsheets.google.com/ccc?key=0AnK3z4PDhXH-dDRiTExXVFo1QlBGb05NeUpFRG0tSWc&hl=en#gid=0

Not sure why they monitored different things but I still haven't figured out what will help.

Thank you all so much for your help.
 
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