What are your LTFT’s at idle?

linnadawg · 10-13-2021, 10:00 PM

My 2011 M3 has -20% long term fuel trims at idle. Pretty much goes away while driving but anytime I stop it’s right back to -20%. Short terms are always near 0% at idle.

linnadawg · 10-16-2021, 09:14 AM

Can someone plug in a scan tool and check? That would be great thanks.

linnadawg · 10-20-2021, 06:28 PM

Annnybodyyyyyy

C-los · 10-30-2021, 01:21 AM

sounds like either you have an exhaust leak around the O2's or an injector is sticking open. NO way it should be -20% at idle.

You're running stupid rich

Gossypiboma · 10-30-2021, 09:13 AM

What are you using to check the trims?

linnadawg · 11-01-2021, 11:34 PM

Quote:

Originally Posted by C-los

sounds like either you have an exhaust leak around the O2's or an injector is sticking open. NO way it should be -20% at idle.

You're running stupid rich

If you have an e92 M3 can you plug in and check. As soon as I get off idle I’m near 0% the entire time I drive. I’ve read bmw literature that says to not let these cars idle so I’m wondering if this is just a weird quirk. No exhaust leaks. New Bosch 02’s. Not running like it’s rich and doesn’t smell. No smoke. Injectors are not leaking. Good gas mileage. Just passed smog.

linnadawg · 11-01-2021, 11:36 PM

Quote:

Originally Posted by Gossypiboma

What are you using to check the trims?

Snap on verus edge and also in global obd2 data as well.

bennylagoon · 11-12-2021, 06:23 PM

Same "Problem" for me. LTFT near 0% when i put my foot on the throttle. At idle LTFT are -25%.

Exhaust gaskets are new ans O2 sensors are new too.

Anybody ? Thanks

linnadawg · 11-22-2021, 09:31 PM

Quote:

Originally Posted by bennylagoon

Same "Problem" for me. LTFT near 0% when i put my foot on the throttle. At idle LTFT are -25%.

Exhaust gaskets are new ans O2 sensors are new too.

Anybody ? Thanks

I think this might be normal for this car. It passed smog easy and doesn’t have any problems. Bmw says don’t let this car idle just start it and go. If I see another one I’ll check the numbers.

The-Traveler · 07-29-2022, 11:21 PM

I’m having same issues and replaced exhaust gaskets but no change even though they were leaking.

drwankel · 07-30-2022, 01:38 AM

On this subject- how do you view fuel trim in ISTA?

NiBe · 07-30-2022, 05:06 PM

Quote:

Originally Posted by drwankel

On this subject- how do you view fuel trim in ISTA?

Something like this:

Additive = STFT
Multiplicative = LTFT

Btw I think that at idle only STFT are used.

10-13-2021, 10:00 PM	#1
linnadawg New Member 6 Rep 29 Posts Drives: 06 330i Join Date: Dec 2014 Location: Ca iTrader: (0)	What are your LTFT’s at idle? My 2011 M3 has -20% long term fuel trims at idle. Pretty much goes away while driving but anytime I stop it’s right back to -20%. Short terms are always near 0% at idle.
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10-16-2021, 09:14 AM	#2
linnadawg New Member 6 Rep 29 Posts Drives: 06 330i Join Date: Dec 2014 Location: Ca iTrader: (0)	Can someone plug in a scan tool and check? That would be great thanks.
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10-20-2021, 06:28 PM	#3
linnadawg New Member 6 Rep 29 Posts Drives: 06 330i Join Date: Dec 2014 Location: Ca iTrader: (0)	Annnybodyyyyyy
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10-30-2021, 01:21 AM	#4
C-los Second Lieutenant 64 Rep 258 Posts Drives: 2013 M3 Join Date: Feb 2014 Location: Tx iTrader: (4)	sounds like either you have an exhaust leak around the O2's or an injector is sticking open. NO way it should be -20% at idle. You're running stupid rich
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10-30-2021, 09:13 AM	#5
Gossypiboma Major 542 Rep 1,195 Posts Drives: 13' M3 6MT 18' M3 CS Join Date: Aug 2012 Location: The John iTrader: (8)	What are you using to check the trims?
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11-12-2021, 06:23 PM	#8
bennylagoon bennylagoon 3 Rep 22 Posts Drives: BMW M3 E92 Join Date: May 2020 Location: France iTrader: (0)	Same "Problem" for me. LTFT near 0% when i put my foot on the throttle. At idle LTFT are -25%. Exhaust gaskets are new ans O2 sensors are new too. Anybody ? Thanks
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07-29-2022, 11:21 PM	#10
The-Traveler Lieutenant 137 Rep 560 Posts Drives: E92 M3 & G30 530e Join Date: May 2015 Location: Toronto iTrader: (0)	I’m having same issues and replaced exhaust gaskets but no change even though they were leaking.
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07-30-2022, 01:38 AM	#11
drwankel Major 1043 Rep 1,047 Posts Drives: 2012 E92 M3 ZCP, 2021 M340i Join Date: Feb 2016 Location: Bothell, WA iTrader: (0)	On this subject- how do you view fuel trim in ISTA?
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