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Old 01-12-2021, 07:57 AM   #29
JIM THEO
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That's why I told you to try a new MAF, at full throttle the car uses open loop mixtures so no need for MAF corrections
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Old 01-12-2021, 08:19 AM   #30
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maf has no problem to me
anyway always good to clean it
your problem is a faulty lambda sensor, maybe you got it damaged , it swings between max and min so you need to replace that
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Old 01-12-2021, 11:06 AM   #31
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That's why I told you to try a new MAF, at full throttle the car uses open loop mixtures so no need for MAF corrections
The MAF voltages consistently correlate to engine load in his logs. It is something on the fueling side like a pump issue or DI seal, or an O2 sensor. That is why I keep asking for a steady state log to confirm.
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Old 01-12-2021, 11:28 AM   #32
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I had no time to look at the log files actually
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Old 01-12-2021, 06:27 PM   #33
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Originally Posted by JIM THEO View Post
That's why I told you to try a new MAF, at full throttle the car uses open loop mixtures so no need for MAF corrections
Wondering how a new MAF makes a difference? A friend that has a BRZ let me borrow his MAF. I took off mine and and put his on. Took it for a drive and still had the problem.

Was there something else that i missed doing? Disconnect the battery,etc?

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maf has no problem to me
anyway always good to clean it
your problem is a faulty lambda sensor, maybe you got it damaged , it swings between max and min so you need to replace that
Lamdba you mean o2 sensor? I did clean my MAF sensor with a spray for this kind. Still the same.

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The MAF voltages consistently correlate to engine load in his logs. It is something on the fueling side like a pump issue or DI seal, or an O2 sensor. That is why I keep asking for a steady state log to confirm.
Thanks for taking a look. By what you see, those are the possible issues? What kind of steady state log would i need to validate your point?

Im thinking on doing another normal run and another hard pull and upload to datazap again (longer drives)

I would need something to show the mechanics to they can address the issue, from fuel pump problem to a sensor. They tell me its hard to tell without a check engine light.
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Old 01-12-2021, 07:14 PM   #34
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Thanks for taking a look. By what you see, those are the possible issues? What kind of steady state log would i need to validate your point?

Im thinking on doing another normal run and another hard pull and upload to datazap again (longer drives)

I would need something to show the mechanics to they can address the issue, from fuel pump problem to a sensor. They tell me its hard to tell without a check engine light.
Either something is causing the wild AFR readings, or the sensor itself is bad. I think tomm.brz is probably right and yes lambda is o2 sensor.

A steady state, IE just idling and touching nothing would just make it easier to see. If running conditions are not changing and the sensor is giving you wildly different o2 readings it helps narrow it down.
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Old 01-13-2021, 01:11 AM   #35
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I tried this already, and didnt make a difference.



This is very interesting. I did two hard pulls and on those scenarios, i do not feel the sluggish problem. I am more confused now...

Its possible that the issue is still there, but since i'm accelerating hard i do not notice it on those cases. Seems like the issue is mostly felt when i drive the car 'normaly', when i hit the gas hard, it appears i dont feel the problem.

I did noticed that after driving hard for a bit, my idle problem got a bit worse. It's all strange

That datazap.me tool is great, i was able to upload the two pulls and it shows a graph:

https://datazap.me/u/jframonex/brz-pull-1?log=0&data=1-13

https://datazap.me/u/jframonex/brz-p...og=0&data=1-13

Does this mean anything?
I am no expert but a couple things I noticed.

Zooming into a pull I can see AFR looks good, no Knock correct and your adv. multi moved from .7 to .89 meaning your fueling looks good...

Next let the car sit till cold. Turn it on and let it just idle for about 10-15 mins. Log it and post it like you did the pulls.
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Old 01-13-2021, 07:15 AM   #36
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Originally Posted by jflogerzi View Post
I am no expert but a couple things I noticed.

Zooming into a pull I can see AFR looks good, no Knock correct and your adv. multi moved from .7 to .89 meaning your fueling looks good...

Next let the car sit till cold. Turn it on and let it just idle for about 10-15 mins. Log it and post it like you did the pulls.
you re no expert and it shows! you re wrong sorry
afr is maxed out at 11.25 and oscillates in closed loop

it means FAULTY O2 SENSOR

the guy has to replace the first lambda (O2) sensor, the one with the grey connector
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Old 01-13-2021, 12:04 PM   #37
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I am no expert but a couple things I noticed.
If you look at this short section of the car idling you can see that MAF voltage and engine load are stable (3rd and 4th column) but AFR swings wildly(last column). 11.25 is the min our factory o2 will read, 20.33 is max
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Old 01-13-2021, 03:35 PM   #38
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Originally Posted by NoHaveMSG View Post
Either something is causing the wild AFR readings, or the sensor itself is bad. I think tomm.brz is probably right and yes lambda is o2 sensor.

A steady state, IE just idling and touching nothing would just make it easier to see. If running conditions are not changing and the sensor is giving you wildly different o2 readings it helps narrow it down.
I recall that when my UEL header was installed (about 1 + year ago), the tech used my OEM o2 sensor. Is this the sensor i could be looking at replacing? I think its the only one since i have a catted front pipe. Im not sure if there is another o2 sensor on the BRZ.

This is an idle from cold start:
https://datazap.me/u/jframonex/brz-c...og=0&data=1-13

Idle for few mins after driving the car for a while:
https://datazap.me/u/jframonex/brz-idle-warmedup?log=0&data=1-13

And this one is normal drive for reference:
https://datazap.me/u/jframonex/brz-n...og=0&data=1-13

Quote:
Originally Posted by jflogerzi View Post
I am no expert but a couple things I noticed.

Zooming into a pull I can see AFR looks good, no Knock correct and your adv. multi moved from .7 to .89 meaning your fueling looks good...

Next let the car sit till cold. Turn it on and let it just idle for about 10-15 mins. Log it and post it like you did the pulls.
Ty just posted some sample above.

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you re no expert and it shows! you re wrong sorry
afr is maxed out at 11.25 and oscillates in closed loop

it means FAULTY O2 SENSOR

the guy has to replace the first lambda (O2) sensor, the one with the grey connector
Would a bad o2 sensor cause the rough idle and also sluggish acceleration? Im wondering why i only feel the sluggish acceleration during a certain rpm range (3k - 4k). I think this range is where the famous torque dip is mostly seen. My car has a UEL header but does that has something to do with it?
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Old 01-13-2021, 04:55 PM   #39
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They are cheapish. 200$ at the dealer. I would just replace it. He knows his stuff.

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Old 01-14-2021, 01:53 AM   #40
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of course a bad o2 sensor makes everything shitty because it sends bad datas for the closed loop
and make the open loop also bad and probably forces the car in a sort of open loop/speed-density/recovery mode if it gets ou of range enough with trims or inconsistent lambda signal
or just run shitty like in your case, and the afr oscillating only between min and max is quitely sure because of a faulty o2 sensor (which is more appropriate to call it afr or lambda sensor, usually we refer as o2 as the seondary less usefull sensor)
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Old 01-14-2021, 03:08 AM   #41
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Quote:
Originally Posted by NoHaveMSG View Post
If you look at this short section of the car idling you can see that MAF voltage and engine load are stable (3rd and 4th column) but AFR swings wildly(last column). 11.25 is the min our factory o2 will read, 20.33 is max
To clarify - does that mean the AFR values would display 11.25 as the lowest value from OBD tools, though stock tunes go richer than that? (10.8 or so I recall).
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Old 01-14-2021, 03:12 AM   #42
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To clarify - does that mean the AFR values would display 11.25 as the lowest value from OBD tools, though stock tunes go richer than that? (10.8 or so I recall).
No your right 11.25 is not the min. I am wrong on that
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