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Old 07-13-2019, 11:14 PM   #1835
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Originally Posted by 86TOYO2k17 View Post
High positive LTFT typically means you have a leak. Especially if LTFT decrease as RPM increases. Meaning worse at idle and less noticeable at higher throttle/rpm. Also positive Fuel trim also means your running lean (from unmetered air entering in) aka you got a vacuum leak someplace. Best to not drive the car until resolved or you will continue to do damage to the engine especially if the leak is bad enough that even LTFT can’t compensate enough.
Okay thanks. I can't find the leak. All hoses are new and clamped. Every single one of them. The only leak I know of is the one in my intake piping (at the end, where it connects to the wastegate). Not sure if a leak in that location can cause my trims to be like that. My tuner did something to compensate for the lean fuel trims but it just started acting weird today.
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Old 07-13-2019, 11:24 PM   #1836
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Okay thanks. I can't find the leak. All hoses are new and clamped. Every single one of them. [SIZE="5”]The only leak I know of is the one in my intake piping[/SIZE] (at the end, where it connects to the wastegate). Not sure if a leak in that location can cause my trims to be like that. My tuner did something to compensate for the lean fuel trims but it just started acting weird today.


ANY leak after the MAF will cause your issue.

You talking about where the intake pipe connects to throttle body with the rubber coupler?
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Old 07-13-2019, 11:31 PM   #1837
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ANY leak after the MAF will cause your issue.

You talking about where the intake pipe connects to throttle body with the rubber coupler?
Yeah that one. I'll contact Sprintex for a new one. Costs $95, they said. Going to have the car up on a lift to check for exhaust leaks as well. Even a leak in the header can cause my condition right?

If the exhaust and intake piping doesn't do it, I don't know what to do.
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Old 07-13-2019, 11:36 PM   #1838
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Yeah that one. I'll contact Sprintex for a new one. Costs $95, they said. Going to have the car up on a lift to check for exhaust leaks as well. Even a leak in the header can cause my condition right?

If the exhaust and intake piping doesn't do it, I don't know what to do.
A leak in intake pipe will for sure cause a high LTFT.
A Leak at the header to engine gasket could effect LTFT some, but not that bad. Maybe 5-20% depending on how bad the leak is. But if it’s bad enough to effect it 10%+ you should be able to hear it pretty obviously.
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Old 07-19-2019, 10:05 PM   #1839
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https://datazap.me/u/kev0/huhh

here's my latest log on E85. It appears that I'm running rich now, right? Still got the P0171 code.
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Old 07-21-2019, 12:42 AM   #1840
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A little history...

Been running Delicious Tune stage 2 (93 octane) for several months now with no issues. Decided to go with the FlexFuel BT kit and have gotten some revised tunes for it based on that install.

However, once I got the ok to add E85, I wanted till my gas light came on then added E85 - nearly a full tank.

That's when it started - hesitating and bogging - felt like the a/c was being turned on and off or someone had been jerking the parking brake. I really only feel it under 3k rpm, partial and full throttle.

I have a silicone inlet tube, afe panel air filter, FT86SF catted UEL header.

Again, it was running fine on 93. Only started having issues on E85. I've attached some logs with multiple scenarios. Not sure if it's the tune or the E85.

https://datazap.me/u/ba9092/log-1563...?log=2&data=22
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Old 07-23-2019, 06:44 PM   #1841
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SC belt snapped while driving. Now fuel trims won't read (see STFT). Wth happened!?

https://datazap.me/u/kev0/wdd
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Old 07-24-2019, 12:31 AM   #1842
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Here is my log after scaling the MAF. How does it look. AFR looks good now, still have some negative STFT.

Mods: Perrin CAI, OFH UEL with Perrin OP, Berk FP and Invidia CB.

3rd Gear Pull:
https://datazap.me/u/sideways/log-15...&data=1-6-8-13
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Old 07-24-2019, 12:45 AM   #1843
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Here is my log after scaling the MAF. How does it look. AFR looks good now, still have some negative STFT.



Mods: Perrin CAI, OFH UEL with Perrin OP, Berk FP and Invidia CB.



3rd Gear Pull:

https://datazap.me/u/sideways/log-15...&data=1-6-8-13
Pls provide also log of normal driving, while the vehicle is in closed loop.
Anyway you are quite rich in some areas. Around 5400 rpm you command afr 12.24 and measure 11.25.. thus 100-(11.25/12.24)*100 = 8.1 means you are 8.1% + 2% of negative ltft richier. 10% is quite much and you have to reflect it in your maf scaling.
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Old 07-24-2019, 12:52 AM   #1844
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Pls provide also log of normal driving, while the vehicle is in closed loop.
Anyway you are quite rich in some areas. Around 5400 rpm you command afr 12.24 and measure 11.25.. thus 100-(11.25/12.24)*100 = 8.1 means you are 8.1% + 2% of negative ltft richier. 10% is quite much and you have to reflect it in your maf scaling.
Thank you. I will look into it.

Here is some nomal driving
https://datazap.me/u/sideways/log-15...log=0&data=1-6
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Old 07-24-2019, 12:57 AM   #1845
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Thank you. I will look into it.



Here is some nomal driving

https://datazap.me/u/sideways/log-15...log=0&data=1-6
Ok. Try to keep your fueltrims within +-5% range.
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Old 07-24-2019, 01:04 AM   #1846
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Ok. Try to keep your fueltrims within +-5% range.
Yeah, I'm going to clean MAF and check to leaks in the intake. I'm guessing im seeing negative ltft due to possible leak.
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Old 08-08-2019, 12:41 AM   #1847
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Currently running stage 2+ OFT tune with 93 octane gas from Canada. Only mods are catless headers, drop in apexi air filter and a catback.

I can't seem to get anywhere close to 1 IAM. After driving at least 20 minutes and even driving the car hard and going through the rev ranges, I can't get IAM to move.

The highest I've seen it is .78, I've tried 94 and 93 from two different gas stations.

Any reason the cause of this could be? Is it purely based on bad gas? Anything else that's alarming based on the log below?

https://datazap.me/u/lc300/oft-v4

Last edited by lc300; 08-08-2019 at 06:55 AM.
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Old 08-08-2019, 01:15 AM   #1848
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Currently running stage 2+ OFT tune with 93 octane gas from Canada.

I can't seem to get anywhere close to 1 IAM. After driving at least 20 minutes and even driving the car hard and going through the rev ranges, I can't get IAM to move.

The highest I've seen it is .78, I've tried 94 and 93 from two different gas stations.

Any reason the cause of this could be? Is it purely based on bad gas? Anything else that's alarming based on the log below?

https://datazap.me/u/lc300/oft-v4
Do you have catless header?
Any intake mods?
Does IAM drop at all or just not go up?
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