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09-15-2021, 10:47 AM | #43 |
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The Following 2 Users Say Thank You to Dzmitry For This Useful Post: | FrickingReallySlow (09-15-2021), jrhudson (09-15-2021) |
09-15-2021, 10:59 PM | #44 | |||
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I will look at the upstream o2 sensor tomorrow. Quote:
So the issue does remain. I am starting to think it is my fueling system as well. I forgot to mention that my car sat for 4 months with E85 til I drained most of it out and flushed it with 91. Not only that, but I am running 100 octane right now though. I went forward in reving the engine rpm at idle around 2k-3k to help with ring seating against the cylinder walls. https://datazap.me/u/jrhudson/some-b...-8-10-25-34-35 1st one is from start up. My LTFT was around ~ 14-20%. It does still seem high. Engine sounds normal except for this weird knocking sound. I hear only on the high pressure fuel pump side. I don't hear it on the passenger side(RH). or is this normal and it's just i haven't heard this engine in 6 months. Fuel system status 4 is when the HPFP is on, correct? No oil leaks( so far) I remember during the data logging when i fired up the car that cylinder 3 and 4 were misfiring, but only at start up. It wouldn't misfire for those cylinders every time, but sometimes cylinder 2 would misfire at startup. Every time a cylinder would misfire, it would only be once on the log, though. Maybe a weak spark/coil packs could cause this? But I'm leaning toward the fuel pump issue since the AEM 340 pump I have has been sitting in that old fuel. I might switch to the walbro unit if my AEM one is mucked up from the old E85. I have purchased a new fuel filter I'll pull out the fuel assembly tomorrow and i also got a fuel injector tester/cleaner for the stock port injectors im using that were sitting for more than a year. Quote:
No you're right. even when i put apply some revs around 2-3k the LTFT would get a little better but still above +/- 10%. Everything is seemingly fine mechanically wise. Other than the knocking sound from the video above. but I am waiting on my turbo kit. I wasn't planning on doing any real driving until i get my turbo kit installed as well. but i would like it to start up fine and no be running lean like it is. Last edited by jrhudson; 09-15-2021 at 11:20 PM. |
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09-16-2021, 12:18 AM | #45 |
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If you decide to replace your upstream O2 sensor, I can’t stress enough the importance of purchasing an OEM part from a local dealer. Stay away from aftermarket sensors or even “OEM” sensors from online sellers. There are too many junky aftermarket manufacturers and now you have to also watch out for counterfeit OEM parts.
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09-16-2021, 12:59 AM | #46 | |||
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https://datazap.me/u/jrhudson/some-b...1863-1911-1948 To me it looks like the ECU is trying to lean the mixture out every time the injection mode switches from 3 (PI + DI) to 2 (DI). The pattern continues over the whole log, I just marked a short part. I think this would suggest DI is providing the expected amount of fuel, and PI isn't. At least that's the easier one to inspect? I'm still confused why injection mode 2 (DI only) at idle maintains the high positive LTFT. Maybe there's something special about idle. Hopefully someone else will chime in. Edit: Are you sure your stock tune isn't scaled for larger injectors?
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Last edited by itschris; 09-16-2021 at 01:10 AM. |
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The Following User Says Thank You to itschris For This Useful Post: | jrhudson (09-16-2021) |
09-16-2021, 01:34 AM | #47 | |
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Yes, I thought it would be these old PI that might have caused some issues and i don't think the DI will be the issue. I got them cleaned along with the DW700cc PI. But i didn't clean the stock PI since at the time i didn't think i would need them. LTFT seems to stay high no matter what the injector mode. I wouldn't know if the stock tune is scaled for larger injectors. i only have the stock PI injectors installed on there and those are the same ones that came from the factory. Would my stock tune be different from other 86/frs/brz? edit: plan is to drive her like maybe half a mile to see if anything is amiss. Won't likely be going further than that. will report back with any updates. Last edited by jrhudson; 09-16-2021 at 01:45 AM. |
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The Following User Says Thank You to jrhudson For This Useful Post: | Dzmitry (09-16-2021) |
09-16-2021, 08:54 AM | #48 |
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You mentioned in another thread that you accidentally plugged a temperature connection to a knock sensor. Could that have "shorted out" something in the ECU?
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09-16-2021, 09:12 AM | #49 |
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Definitely a weird clacking noise, but doesn't sound like it is something serious to be concerned about... I hope Not sure what it would be though, that's always hard to track down.
Your AEM fuel pump is supposed to be designed to withstand Ethanol no problem, but I have no experience with aftermarket pumps so I can't say much there. I just have a feeling it doesn't have so much to do with the fuel that sat in there (which you drained), but rather that something may be faulty. I wonder if it would actually be helpful to just get a custom tune started right now to see if it solves your problems. Because with some of your aftermarket stuff in there, and a fresh rebuilt engine, something just doesn't seem to be quite right. But you had it running prior to the rebuild, so it doesn't make a lot of sense. |
09-17-2021, 11:29 AM | #50 | |
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The one major change that I noted that OP made (in post #24) was dropping compression ratio down from stock 12.5:1 to 10.5:1 but he stated that his tuner said that shouldn't have an affect on the operation of the engine. Are we all in agreement with his tuner? |
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The Following User Says Thank You to FR-S2GT86 For This Useful Post: | Dzmitry (09-17-2021) |
09-17-2021, 11:40 AM | #51 | |
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From a little googling, it seems that in the case of compression ratio increasing, a tune is kind of required to change the timing. Can't find anything on decreasing the compression ratio in that regard, at least not from a quick search. It's something to think about. |
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09-18-2021, 12:14 AM | #52 |
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Okay, i pulled the fuel pump assembly and everything looks fine. I was missing the C clip from holding down the spring for the top part of the fuel assembly, but i just replaced the c clip. I also changed the fuel filter sock, the one old didnt look too bad though. Doing this resulted in no changes. Still starts and struggles to idle until car dies.
I ordered an adapter for the fuel lines so i could have the option of connecting a fuel pressure gauge on it. To actually see the pressure of the fuel pump. |
09-18-2021, 12:31 AM | #53 | |||
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Yea, I'm sure the pump is fine. I pulled the assembly and changed the fuel filter. To check the fuel pump, I purchased an adapter for the fuel lines with a 1/8 npt port for a fuel pressure gauge. it feels like there isn't enough fuel pressure? i don't know. As for the tune, maybe it'll fix my issue, but I still think it's something small that I forgot or is broken. I want to say my stock PI injectors are bad. I pulled them and used this little device i saw from some youtube video that pulses the injectors if you connect to them to see the flow of them. Not really sure if the injectors are bad or not since they differently from one another. sorry for the video crap video but it was difficult by myself with this one. Doing this "cleaning" didnt do anything. Problem remains Quote:
I have asked him about this with a datalog, but only said it might be timing. he said this happens to alot of built FA20 motors. But I know i timed this motor correctly. No further info on his end about my issues. Quote:
So i happen to just walk to film my engine and it does this. I was doing a datalog as well so there's data on it. https://datazap.me/u/jrhudson/so-it-...37-46-50-51-52 edit: Still dies after the startup but will sometimes start up and have a somewhat weird idle and misfire a little and eventually go to idle rpm. I will drive it. I need to put the bash bar on there, and we'll see if the car can even move 1000 ft and back. Hopefully it'll either post a CEL or just fix it's lean condition. Next thing I'll check after driving her is the spark plugs and ignition coil packs. i'll recheck the gap on my plugs. Theyre aftermarket as well, but per Zach these would be fine even NA. Last edited by jrhudson; 09-18-2021 at 12:47 AM. |
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09-18-2021, 01:03 AM | #54 |
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Maybe, but since those 2 sensors still work now i doubt it caused damage. I did check the continuity on the harness
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The Following User Says Thank You to jrhudson For This Useful Post: | blsfrs (09-18-2021) |
09-18-2021, 11:29 AM | #55 | |
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So, I was wondering if all of your sensors are OEM or do you have any aftermarket sensors installed that could be at fault? And...... What happens when you disconnect the upstream O2 sensor and try to start with that disconnected? |
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09-18-2021, 12:42 PM | #56 | |
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My custom tune is for built motor with a turbo on it. Not built motor with NA tune. I'm just trying to get my motor running okay without the turbo first, and I also don't have the turbo kit yet. Over 2 months waiting =(.. As for the upstream o2 unplugged start up, i havent tried this yet. what would this do? When you say to disconnect the O2 sensor you mean just the connector right? Last edited by jrhudson; 09-18-2021 at 01:17 PM. |
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