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12-29-2021, 05:36 PM | #1 |
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Urgent! High LTFT trim and extremely low IAM on a Stage 2+ tune
Hello, I'm rocking a 15 BRZ with a Stage 2 E85 tune. Aftermarket catted headers, cutback, and no intake mods. I've been running with this for about a year now with little issue.
On my last fuelup I got a really rough start the following morning. I checked to make sure I didn't get a mouse in the filter and then plugged in my oft to check things. Lo and behold I have a LTFT of -17% and a IAM of .84. Ambient temps are in the 40s F. I wasn't immediately concerned but I am on my way back home from visiting family for the holiday so I dont have much option but to watch it, pray, and baby it home. I'm now taking a rest stop and I've watched it jump between -17-12% on LTFT and IAM has slowly fallen .64 to .43 and now is down to .34. KC has hovered around 0-1. If I hadn't noticed the rough start I probably wouldn't even known there was a potential issue. The car isn't down on power and doesn't sound weird currently. Fingers crossed. I'm almost sure that the last station I filled up at gave me some E85 with a really low E% and that is where this is coming from. Am I in serious and immediate danger of catastrophic damage? I have a Stage one tune handy should I flash back to that or stick with the Stage 2 for the remaining 40 miles home? I've got about 3/4 of a tank remaining so diluting the crap out of it with some premium isn't really a strong option either. Thoughts? |
12-29-2021, 05:44 PM | #2 |
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fill with gasoline and put stage2 for petrol
drive slow for a bit to settle ltft, won t be a huge problem and you ll have conservative timings |
12-29-2021, 05:53 PM | #3 |
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12-29-2021, 06:09 PM | #4 |
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High ltfts are indication of too much air not enough fuel when you have positive trims it means that there is that much more air in the system so the car adds fuel in your case it's pulling back fuel alot. Low iam is indication of bad fuel you could always add some e85 booster to help stabilize the fuel in your tank. Other than that maybe doing a data log while running the car and having some of the tuners here on the forums look over it just to be on the safe side.
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12-29-2021, 06:10 PM | #5 |
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12-29-2021, 06:17 PM | #6 | |
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Quote:
Not a high trim, that's a negative 17% trim. So too much feul not enough sir. I've tried that particular fuel treatment and it makes the car incredibly hard to cold start when it's below 40f. Hunting premium now. LTFT -21 IAM .25. Only finding 87 so far. |
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12-29-2021, 06:27 PM | #7 |
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That's what I'm saying, when my car was running positive trims. I had a vacuum leak so the car was reading excess air in the O2 sensor so naturally the car added fuel giving me positive trims. In this case there is a negative trim. So the car is pulling back fuel causing a negative trim. Ltfts are the ecu making adjustments to the fuel trim levels. If his afr is still at 14.7 then it's safe to say the engine is doing what it can to get that ratio this rules out faulty injectors and fuel pump. Because they're working just fine. Check your afr at idle and under light throttle.
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12-29-2021, 06:33 PM | #8 | |
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At idle it's holding 14.69:1 Light revs fluctuates down to 12ish:1. |
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12-29-2021, 06:47 PM | #9 | |
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12-29-2021, 06:52 PM | #10 |
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Alright, I'm going to drive the last 20 miles home then. If I had the proper tune handy for gasoline & aftermarket catted I would dump in more premium and flash it but there's too much uncertainty to make changes that may or may not help.
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12-29-2021, 06:53 PM | #11 | |
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12-29-2021, 07:00 PM | #12 |
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Not gonna try that either. Sticking with what's on there for now. It's gotten me 60 miles and it will get me the last 20. My primary concern is running a whole hell of a lot of timing on fuel with insufficient E%. The .37 IAM should keep it scaled back until we pinpoint the issue (be it fuel or sensory).
The ECU knows best until it doesnt. |
12-30-2021, 12:47 AM | #13 |
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you have no leak
you have low ethanol for your e85 tune, stage2 petrol will have good timing and present high ltft but it will work ok stage1 will have probably more positive ltft but lower timing.. it is good, it s just slower running with e85 tune as you are now, it is mote risky But if you drive slowly nothing happen.. you are NA, nothing will happen. |
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12-30-2021, 10:16 AM | #14 |
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What is your E% at?
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