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01-07-2021, 07:39 PM | #1 |
Scooby Newbie
Member#: 519178
Join Date: Oct 2020
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DAM Stuck at 8
2003 WRX 5MT
Only mod is a catless up pipe I run lean based off of A/F correction being positive especially under WOT but I have no vacuum leaks, no exhaust leaks, my MAF is working properly and I just replaced both A/F sensors in the exhaust. Car is on stock tune. What could it be? Log of just cruising for a little bit but can definitely log more if asked: https://drive.google.com/file/d/1hRH...ew?usp=sharing Please help thank you
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01-07-2021, 08:01 PM | #2 |
Scooby Newbie
Member#: 409332
Join Date: Dec 2014
Location: SE MI/SE WI
Vehicle:2005 LGT ABP |
Your top range fuel trim is almost pegged, and it looks like it gets progressively better at lower airflows (though still high in at least range C). I only have experience with 32 bit ECUs so maybe it's different in your case, but you shouldn't be seeing any A/F correction at WOT since your car's in open loop and A/F correction only gets applied in closed loop fueling. Maybe you mean A/F learning? In this case, this value is learned and stored in a lower power regime (closed loop fueling) but gets applied when you're at WOT.
I'm barely seeing any transition to open loop fueling in your logs, but when it does happen towards the end of the mini-pulls you did the AFR looks about where it should be w/ the stock sensor. This is probably only because your top fuel trim is being applied, and it may lean out at actual WOT. I wouldn't do any more WOT pulls until you figure it out, though. In any case - if you have verified for sure that the MAF is good, the front O2 sensor is good, and there are no vacuum leaks, I'd take a look at the air filter to make sure it's not super dirty and after that start looking at fueling. Verify fuel pressure tracks with manifold pressure as it should. It should be at 41-46 psi with the vacuum reference line disconnected. When connected, the value should be the hose-disconnected value plus whatever the manifold pressure is. For example, when you're in vacuum at, say, -8 psi, the fuel pressure should be between 33 and 38 psi. Make sure you check this with a little bit of throttle too, to see what happens when there's a little more demand for fuel. Again, no WOT. If all of that is good, start thinking about injectors. Last edited by awfulwaffle; 01-07-2021 at 08:25 PM. |
01-07-2021, 09:19 PM | #3 |
Scooby Guru
Member#: 36838
Join Date: May 2003
Chapter/Region:
MAIC
Location: Reston VA
Vehicle:2001 B50 RSTi Sedan 2011 DGM WRX hatch |
Stuck it into datazap for folks... much easier to see:
https://datazap.me/u/acquacow/conste...a=1-4-15-16-18 |
01-08-2021, 02:21 AM | #4 |
Scooby Newbie
Member#: 519178
Join Date: Oct 2020
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Thank you so much for the informative post! So I understand the formula and I want to try it but where is the vacuum reference line? I tried a quick google search and could not find it. Also that datazap thing is super cool thank you!
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01-12-2021, 11:06 PM | #5 |
Scooby Newbie
Member#: 519178
Join Date: Oct 2020
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I took out my fuel injectors and got them flow tested they got cleaned and are delivering fuel at max capacity and replaced my fuel filter. Still have the same issue so what could it be? Subaru said my MAF was good but only because it was delivering normal numbers has anyone had a MAF show decent numbers but still be bad? I don’t think it’s the fuel pump otherwise the issue would be more noticeable right?
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01-14-2021, 12:21 PM | #6 | |
Scooby Specialist
Member#: 385256
Join Date: Mar 2014
Chapter/Region:
NESIC
Vehicle:'18 Giulia QV '21 Giulia Q4 |
Quote:
can you post another log and include Boost as one of the parameters? |
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01-29-2021, 11:39 PM | #7 |
Scooby Newbie
Member#: 519178
Join Date: Oct 2020
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Yo it’s alright thank you guys for all the advice my car is now working 100% as intended. I asked NateWade Subaru to do literally 1 thing and it was to test my MAF sensor and they said it was fine. Replaced my MAF sensor and it fixed everything :/
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