AFR mostly rich, erratic at times - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

WORKS · 04-13-2015, 05:11 PM

Showed this to our tuner.

Seems you may have resolved the issue, but if it persists, he suggested checking for boost leaks.

If you never did a boost leak check after the turbo kit installation, this would be good to do regardless.

Cheers.

Synack · 04-13-2015, 05:22 PM

Quote:

Originally Posted by WORKS

Showed this to our tuner.

Seems you may have resolved the issue, but if it persists, he suggested checking for boost leaks.

If you never did a boost leak check after the turbo kit installation, this would be good to do regardless.

Cheers.

Yeah I did a boost leak check last week before I even ordered any parts. The majority of my searchable area was post-MAF but there isn't that much distance between the MAF and TB. I sprayed some electrical cleaner in several areas to check for bubbles or to see if the motor sputtered or changed at all. Everything was good.

My car has been much better since replacing the factory AFR O2 (upstream).

AgentFT86 · 04-13-2015, 06:08 PM

Used to have two Evos, I'd jump on the socalevo forums and do a search for your problems. It sounds like a boost leak or o2 sensor?

cdrazic93 · 04-13-2015, 06:15 PM

New afr range?

Synack · 04-13-2015, 08:24 PM

Quote:

Originally Posted by AgentFT86

Used to have two Evos, I'd jump on the socalevo forums and do a search for your problems. It sounds like a boost leak or o2 sensor?

My problem is solved. It was the O2 sensor (AFR specifically), replaced it last Friday.

Synack · 04-13-2015, 08:27 PM

Quote:

Originally Posted by cdrazic93

New afr range?

Idle - Fluctuates between high 13's and high 14's
Partial throttle - 13's
WOT - 12's, super high 11's rarely.

Pretty sure my tuner gave me a rich tune because they might've been afraid to go leaner, this was back when the car first came out so nobody really knew the limits of the FA20 yet.

Synack · 04-15-2015, 03:05 PM

And WERE BACK!

5 days later after the stock O2 replacement fixed everything, my car is going full 10:1 at WOT only now. Partial throttle is perfect. Idle is rich, 11-13, 14.7 sometimes.

Suggestions?

Synack · 04-15-2015, 05:11 PM

A couple people mentioned vaccuum lines could've disconnected.

Supposedly @Sportsguy83 knows a bit about that.

King Tut · 04-15-2015, 06:40 PM

Quote:

Originally Posted by Synack

A couple people mentioned vaccuum lines could've disconnected.

Supposedly @Sportsguy83 knows a bit about that.

I know more about it then him, but that would be obvious if it were the issue. Just install your Flex Fuel setup and go get a proper tune.

Synack · 04-15-2015, 07:02 PM

Quote:

Originally Posted by King Tut

I know more about it then him, but that would be obvious if it were the issue. Just install your Flex Fuel setup and go get a proper tune.

I'm not getting anything extra tuned or installed until I find out this issue. It's not the tune that is the problem because I wouldn't have noticed things being worse and different.

I have the android Torque app running and I just noticed a few things:

AFR goes full rich in only lower gears after gas fillup. Just went on the highway and everything was 13's and 14's. Before my fillup all gears were getting straight 10's for AFR on boost.
I just filled up the gas tank after it being low and now my "EGR system" reads complete where before the gas fillup it read incomplete.

I don't know what this means but it might be EGR related. Or something in the fuel system isn't operating correctly.

On an additional note, does anyone know what the fuel rails should be seeing for pressure? I seemed to be seeing ~550-1000PSI when viewing in Torque.

aagun · 04-17-2015, 01:30 PM

Fuel rail should 450psi to 650psi at idles and up to 2000psi or 2800psi at wot

aagun · 04-17-2015, 01:35 PM

Now ckeck ur long term and short term . Is should both at 0% and max for long term is 8% . Write the numbers . Drive the car . And log the both . Then if u have tach steam . Go to test injectors. And disconnect the direct injector . The fuel regulater will stop for 5 sec . The long term willl change . Log it

aagun · 04-17-2015, 01:36 PM

Where are u from .. Worm weather ?

Di u have poping . While idle

Go rich cozed by air leakage after maf . Up to afr sensor. . . Or injectors failure by leaking fuel or reduce fuel rate .

Koa · 04-17-2015, 01:43 PM

Quote:

Originally Posted by aagun

Now ckeck ur long term and short term . Is should both at 0% and max for long term is 8% . Write the numbers . Drive the car . And log the both . Then if u have tach steam . Go to test injectors. And disconnect the direct injector . The fuel regulater will stop for 5 sec . The long term willl change . Log it

not true, STFT and even LTFTs will vary above and below 0% if the system is operating as normal to account for variances in fuel quality and atmospheric conditions above what the car was tuned for

all your other advice is sound

04-13-2015, 05:11 PM	#29
WORKS Join Date: Feb 2014 Drives: WORKS CARB Legal Turbo BRZ Location: Sonoma Raceway - Bay Area Posts: 980 Thanks: 407 Thanked 646 Times in 350 Posts Mentioned: 31 Post(s) Tagged: 2 Thread(s)	Showed this to our tuner. Seems you may have resolved the issue, but if it persists, he suggested checking for boost leaks. If you never did a boost leak check after the turbo kit installation, this would be good to do regardless. Cheers. __________________

04-13-2015, 06:15 PM	#32
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	New afr range? __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

04-15-2015, 03:05 PM	#35
Synack Boosted Join Date: Jul 2012 Drives: Sideways Location: Atlanta Georgia USA Posts: 2,377 Thanks: 388 Thanked 716 Times in 414 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	And WERE BACK! 5 days later after the stock O2 replacement fixed everything, my car is going full 10:1 at WOT only now. Partial throttle is perfect. Idle is rich, 11-13, 14.7 sometimes. Suggestions? __________________ *Nismo 370Z 300whp -> FR-S Turbo 450whp on E85 -> Z06 Corvette 500whp* Last edited by Synack; 04-15-2015 at 03:41 PM.

04-15-2015, 05:11 PM	#36
Synack Boosted Join Date: Jul 2012 Drives: Sideways Location: Atlanta Georgia USA Posts: 2,377 Thanks: 388 Thanked 716 Times in 414 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	A couple people mentioned vaccuum lines could've disconnected. Supposedly @Sportsguy83 knows a bit about that. __________________ *Nismo 370Z 300whp -> FR-S Turbo 450whp on E85 -> Z06 Corvette 500whp*

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04-13-2015, 06:08 PM	#31
AgentFT86 Member Join Date: Feb 2015 Drives: 2015 Scion FR-S Location: Socal Posts: 27 Thanks: 4 Thanked 8 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Used to have two Evos, I'd jump on the socalevo forums and do a search for your problems. It sounds like a boost leak or o2 sensor?

04-17-2015, 01:30 PM	#39
aagun Senior Member Join Date: Nov 2012 Drives: 86 Location: uae Posts: 403 Thanks: 202 Thanked 67 Times in 56 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Fuel rail should 450psi to 650psi at idles and up to 2000psi or 2800psi at wot

04-17-2015, 01:35 PM	#40
aagun Senior Member Join Date: Nov 2012 Drives: 86 Location: uae Posts: 403 Thanks: 202 Thanked 67 Times in 56 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Now ckeck ur long term and short term . Is should both at 0% and max for long term is 8% . Write the numbers . Drive the car . And log the both . Then if u have tach steam . Go to test injectors. And disconnect the direct injector . The fuel regulater will stop for 5 sec . The long term willl change . Log it

04-17-2015, 01:36 PM	#41
aagun Senior Member Join Date: Nov 2012 Drives: 86 Location: uae Posts: 403 Thanks: 202 Thanked 67 Times in 56 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Where are u from .. Worm weather ? Di u have poping . While idle Go rich cozed by air leakage after maf . Up to afr sensor. . . Or injectors failure by leaking fuel or reduce fuel rate .

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