P0171 and P117B after Edelbrock SC FIXED

[snowtaipan]

!!!FIXED!!!
P0171 P117B Stability control CEL (Reposting from Edelbrock SC forum for more bandwidth)

Lets knock out some basic info; 2017 BRZ Yellow series, no issues before SC install. I'm an Army Wheeled Vehicle Mechanic with a decade of experience. I had two buddies help with same or better experience. I have read 50 plus TS guides on those codes and at least 10 threads on FT86, haven't seen any solutions. Fuel is 91, no pre-existing faults.

After initial drive cycle, threw P0171 and P117B and StabCtrl, hunting for idle etc. Found out the StabCtrl light is only there to scare you into going to a shop. Checked and found PS PCV hose was loose. Reclamped it, cleaned MAF with CRC MAF cleaner, reflashed the tune. No fuel leaks, hesitation, nothing weird.

Completed multiple drive cycles, everything looked clear, filled the tank like a dumbass, came home to take the wife to get chow and BAM same CELs. Started really hunting and saw bypass valve as a common issue. Smoked bypass valve and PCV, no leaks. Double checked all wiring, hoses, nothing out of place. Saw that over-oiled air filters could do it, cleaned it off and used 25% as much oil as I think it should have. Used starter fluid to see if unmetered air was getting in, no RPM change.

Used the ECUTEK to clear the faults, did another big drive cycle. Using TORQUE I noticed the LTFT is at 38, that seems way high. AF commanded is like 14.6 and measured goes between 14.5-14.7 which should be fine. Since I'm at 90% on the tank the EVAP and Fuel checks are incomplete still. (Edit Aaaand lights are on again!)

Am I missing something?

Consolidated list below:
-Intake air leaks: Negative, used starter fluid
-Faulty front heated oxygen sensor: Unchecked, unlikely as it was OK before install
-Ignition misfiring: Negative, no misfires present
-Faulty fuel injectors: Unchecked, unlikely. No leaks, seals looked OK, not running rough.
-Exhaust gas leaks: Unchecked, unlikely as it was not present before install.
-Incorrect fuel pressure: Unchecked, unlikely
-Lack of fuel: Negative
-Mass Air Flow (MAF) sensor: Negative, cleaned and re-seated, (edit reads 12.8 PSI at idle, accurate)
-Over-oiled intake filter getting MAF dirty: Cleaned both
-Incorrect (PCV) hose connection: Corrected, smoke tested for leaks, looks OK
-Bad PCV valve: Unchecked
-Bypass valve leak: Negative, smoked no leaks, moved under suction and held position.

Current facts:
P0171 P117B
AFR(C) 14.67 AFR(M) 14.85
LTFT 1 31.25
STFT1 .78%
INTAKE 4.4PSI
MAF 12 CFM
O2S1 V 2.21
O2 1X2 .7V
MAF reads 12.8 PSI (accurate for 5k elevation.)
Could someone post up numbers for a stock car with Edelbrock SC and stock tune their STFT, LTFT, AFR(commanded), AFR (measured)?

Thanks in advance everyone.
-Robert Porter

!!!UPDATE: The 1556 with CARB tune uses a 2016 base ROM, and the MAF scaling is bad. Edelbrock provided a K00C tune with a MAF adjustment, everything is happy now.

[Irace86.2.0]

The cells are for a lean condition and a fuel injector performance issue. You say unchecked, yet unlikely. Why?

[snowtaipan]

Originally Posted by Irace86.2.0

The cells are for a lean condition and a fuel injector performance issue. You say unchecked, yet unlikely. Why?

P0171 is the O2 sensor reading lean condition, which yeah could be injectors but is more often MAF sensor or vacuum. I'm saying unlikely since the SC tune is designed for a bone stock vehicle (ergo upgraded injectors unnecessary) and because there were no issues with the injectors before SC install. I haven't specifically tested them, but I didn't notice any odd readings while scanning them. Hence unchecked. Plus I don't have the shit to physically test them on hand.

[tomm.brz]

the lean code is not caused directly by the lambda, it is triggered by a lack of proper fuel quantity, Either maf acaling/speed density incredibly off, intake and/or exhaust leaks or bad functioning or inactive injector or blocked pump

[Irace86.2.0]

Originally Posted by snowtaipan

P0171 is the O2 sensor reading lean condition, which yeah could be injectors but is more often MAF sensor or vacuum. I'm saying unlikely since the SC tune is designed for a bone stock vehicle (ergo upgraded injectors unnecessary) and because there were no issues with the injectors before SC install. I haven't specifically tested them, but I didn't notice any odd readings while scanning them. Hence unchecked. Plus I don't have the shit to physically test them on hand.

You have a log?

Are you sure all injectors are clipped in, and there are no leaks?

[snowtaipan]

Originally Posted by Irace86.2.0

You have a log?

Are you sure all injectors are clipped in, and there are no leaks?

I am using torque, it's not great for logging but I can try. What targets?

I just unclipped and cleaned the injectors, retorqued the hold down bolts, and retorqued the manifold bolts.

[CSG Mike]

Originally Posted by snowtaipan

I am using torque, it's not great for logging but I can try. What targets?

I just unclipped and cleaned the injectors, retorqued the hold down bolts, and retorqued the manifold bolts.

Use the ecutek that came with your kit to log.

[snowtaipan]

So the first log is at idle, second is going up to 3k rpm, the third is coming back down to idle.

[snowtaipan]

Originally Posted by CSG Mike

Use the ecutek that came with your kit to log.

I'll try that on my next one, I didn't think I had access

[snowtaipan]

Originally Posted by Irace86.2.0

You have a log?

Are you sure all injectors are clipped in, and there are no leaks?

Will the torque logs I posted work? otherwise I'll dig into the ECU interface and figure out how to log with that.

[tomm.brz]

vacuum leak, check the hoses under the intake manifold, probably it popped out something with the boost

[snowtaipan]

Originally Posted by tomm.brz

vacuum leak, check the hoses under the intake manifold, probably it popped out something with the boost

So I haven't found any loose hoses, especially with the insane hose clamps edelbrock provided.

I did find the EVAP Solenoid blowing to atmo (did a smoke test from the MAF back) and air was pouring out of that thing. Lines are nice and tight, so I wonder if it blew up under boost? or does it normally purge?

[Irace86.2.0]

Originally Posted by snowtaipan

So I haven't found any loose hoses, especially with the insane hose clamps edelbrock provided.

I did find the EVAP Solenoid blowing to atmo (did a smoke test from the MAF back) and air was pouring out of that thing. Lines are nice and tight, so I wonder if it blew up under boost? or does it normally purge?

It should not vent to atmosphere.

[Irace86.2.0]

Originally Posted by snowtaipan

I'll try that on my next one, I didn't think I had access

You can use ECUTEK to do data logging. Super easy. Just search for a tutorial.