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Old 09-09-2021, 05:31 PM   #15
FrickingReallySlow
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Do a datalog during your crank with all the sensors and compare against a good startup that should give a clue. O2, MAF, MAP, AFR etc.
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Old 09-09-2021, 06:55 PM   #16
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Do a datalog during your crank with all the sensors and compare against a good startup that should give a clue. O2, MAF, MAP, AFR etc.
https://datazap.me/u/jrhudson/maf-plugged?log=0&data=7
This one is when the car has the MAF connected.

I dont have any data on a good goodstart up but i did datalog my unplugged MAF start up and connected the MAF when it was running and the car eventually dies when the MAF is connected.
https://datazap.me/u/jrhudson/start-...g?log=0&data=7
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Old 09-09-2021, 07:37 PM   #17
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Check out the sticky in the software tuning thread where ppl post their datalogs and you can compare
https://www.ft86club.com/forums/showthread.php?t=47754

But what I can see is if you look at "total fuel quantity" between your two logs, they reach different peaks 33 (MAF) vs 43 (NO MAF) during the beginning of cold start. So it seems to be a fueling difference which could be caused by MAF.

Did you get the starter fluid yet
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Old 09-09-2021, 08:03 PM   #18
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Weird how on the log it runs for 6-7 seconds it has no stft, ltft, AFR stays the same, ect.

@steve99 thoughts?
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Old 09-09-2021, 08:10 PM   #19
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Check out the sticky in the software tuning thread where ppl post their datalogs and you can compare
https://www.ft86club.com/forums/showthread.php?t=47754

But what I can see is if you look at "total fuel quantity" between your two logs, they reach different peaks 33 (MAF) vs 43 (NO MAF) during the beginning of cold start. So it seems to be a fueling difference which could be caused by MAF.

Did you get the starter fluid yet
I totally forgot about the starter fluid. I do have some and did just try to spray some starter in the intake. The car stays on alot longer with the starter fluid in the intake. It was about 10 seconds of run time then just shuts down after the fuel is burned.

I went to check the fuel pump, and i can for sure hear it prime. I did check the connectors were tight as well.

I will probably pull the fuel pump and at least change the fuel filter.








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Weird how on the log it runs for 6-7 seconds it has no stft, ltft, AFR stays the same, ect.

Yea i saw that as well.

I'll try to do more datalogs to get actual data for those parameters hopefully.

Last edited by jrhudson; 09-09-2021 at 11:34 PM.
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Old 09-10-2021, 01:21 AM   #20
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look on the bright side you reassembled a boxer motor for the first time and its running pretty good! pat yourself on the back.

looking at your timing chain picture, how come your cylinder heads are so clean and a different paint color? Are they also new?
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Old 09-10-2021, 02:43 AM   #21
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look on the bright side you reassembled a boxer motor for the first time and its running pretty good! pat yourself on the back.

looking at your timing chain picture, how come your cylinder heads are so clean and a different paint color? Are they also new?
I am happy about me putting together a boxer motor, there is a lot of...uniqueness to boxer motors. This is my first time assembling any motor.
But the main concern initially was to see if I did it correctly, like mechanically, with no blatant leaks or things like that. It has good oil pressure every time she fires up, over 100psi on cold starts, so happy about that.

Those are my original heads, and they were machined /resurfaced. They look so new because they were cleaned by a process called vapor hone, no idea what that is, it's what the shop called it. The marks were made by a blue paint pen i had lying around, it was so i could see them easier. I copied everything in this how to video. Good video on timing the FA20 motor.


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Old 09-10-2021, 10:30 AM   #22
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Weird how on the log it runs for 6-7 seconds it has no stft, ltft, AFR stays the same, ect.

@steve99 thoughts?
If I'm not mistaken, this is normal (though I am not sure of the reason). STFT and LTFT show 0 until several seconds of running the car. Should be able to find other examples of datazap logs with people starting their car, I believe this is always the case.

EDIT: Looked around, found one. Maybe I'm wrong, STFT was 0, but LTFT kicked in after a second. But maybe it just has to do with the fact that his MAF is disconnected so it's not doing any fueling adjustments.

Last edited by Dzmitry; 09-10-2021 at 10:43 AM.
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Old 09-10-2021, 12:02 PM   #23
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If I'm not mistaken, this is normal (though I am not sure of the reason). STFT and LTFT show 0 until several seconds of running the car. Should be able to find other examples of datazap logs with people starting their car, I believe this is always the case.

EDIT: Looked around, found one. Maybe I'm wrong, STFT was 0, but LTFT kicked in after a second. But maybe it just has to do with the fact that his MAF is disconnected so it's not doing any fueling adjustments.
I wasn't sure, that is why I called on Steve99. It would make sense that they wouldn't read for a little bit but I wasn't totally sure. He would know what the log should show on startup.
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Old 09-10-2021, 03:02 PM   #24
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Well shoot, the brand new OEM MAF didnt change things.

I did put some light throttle in hopes of keeping her running and maybe she’ll throw a code but nothing. It did make her run a litttle bit longer tho

Okay. Now im really stuck. There 3 different logs in this one. 2nd and 3rd ones are where i applied some throttle.

https://datazap.me/u/jrhudson/new-maf

Fuel pump is next, i rather not keep throwing new parts at this. Lame.


Edit: i forgot to mention this is a lower comp block(10.5:1), not the stock compression. Would that be an issue? My tuner said it wouldnt be.
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Old 09-10-2021, 03:25 PM   #25
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Well shoot, the brand new OEM MAF didnt change things.

I did put some light throttle in hopes of keeping her running and maybe she’ll throw a code but nothing. It did make her run a litttle bit longer tho

Okay. Now im really stuck. There 3 different logs in this one. 2nd and 3rd ones are where i applied some throttle.

https://datazap.me/u/jrhudson/new-maf

Fuel pump is next, i rather not keep throwing new parts at this. Lame.


Edit: i forgot to mention this is a lower comp block(10.5:1), not the stock compression. Would that be an issue? My tuner said it wouldnt be.
Weird. Seems like everything is working. It's almost as if the ECU is not recognizing fuel flow or something like that. You got a few misfires there. With LTFT and STFT still not showing, I would think some kind of sensors or something along the lines are not working or not installed properly. The ECU is seeing this and shutting the car off as it doesn't believe it is getting fuel to some extent?? I don't know, because it is recognizing the fuel pump duty % and quantity.
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Old 09-10-2021, 04:02 PM   #26
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It seems like there's no base maps in your ECU for it to use to adjust your fueling whenever there's a MAF so it doesn't even try to adjust STFT/LTFT. but in limp mode will startup and run on a default map. Are you using ecutek for programming? look at the logs while programming and see if there's errors
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Old 09-10-2021, 04:52 PM   #27
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Weird. Seems like everything is working. It's almost as if the ECU is not recognizing fuel flow or something like that. You got a few misfires there. With LTFT and STFT still not showing, I would think some kind of sensors or something along the lines are not working or not installed properly. The ECU is seeing this and shutting the car off as it doesn't believe it is getting fuel to some extent?? I don't know, because it is recognizing the fuel pump duty % and quantity.
Yea, i saw the misfires. I want to say itís because i probably have some leftover starter fluid that wasnít completely dry in intake.
Yea, i thought it was a sensor not plugged in properly so i pulled off the intake manifold. Everything seems to be secure and connected to the correct sensors



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It seems like there's no base maps in your ECU for it to use to adjust your fueling whenever there's a MAF so it doesn't even try to adjust STFT/LTFT. but in limp mode will startup and run on a default map. Are you using ecutek for programming? look at the logs while programming and see if there's errors
Yea, ecutek for tuning. You can take datalogs of the programming part? I wasnt aware of that. Ill do that after i reinstall my intake manifold
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Old 09-10-2021, 07:59 PM   #28
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@FrickingReallySlow i did another reflash of the stock tune, no codes or errors during it.
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