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01-12-2021, 07:57 AM | #29 |
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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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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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01-12-2021, 11:06 AM | #31 |
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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.
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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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01-12-2021, 06:27 PM | #33 | |||
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Quote:
Was there something else that i missed doing? Disconnect the battery,etc? Quote:
Quote:
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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01-12-2021, 07:14 PM | #34 | |
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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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01-13-2021, 01:11 AM | #35 | |
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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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01-13-2021, 07:15 AM | #36 | |
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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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01-13-2021, 12:04 PM | #37 |
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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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01-13-2021, 03:35 PM | #38 | ||
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Quote:
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:
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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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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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) |
01-14-2021, 03:08 AM | #41 |
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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).
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01-14-2021, 03:12 AM | #42 |
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No your right 11.25 is not the min. I am wrong on that
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