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Old 06-12-2019, 10:50 PM
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6.0 lq4 getting lean codes both banks

Hello Iíve been getting p0171 and p0174 leans both banks itís in my streetrod Iíve been getting these codes since Iíve gotten it running and new o2 sencers and new intake gasket no vacuum leaks that Iíve found and no exzaust leaks.

I just noticed today that I had the mass air flow sencer in backwards.
I only get the codes when the car idols warmed up

Would that cause my lean codes ?

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Old 06-12-2019, 11:27 PM
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I can only tell you what caused my lean codes and you can take it from there. Turns out my problem was the tune used the wrong size injector. Once that was corrected I've never seen the codes again. Short and long term fuel trims are where they should be now.
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Old 06-13-2019, 07:07 AM
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Check your Short Term Fuel Trim [STFT] while the car is warmed up and idling. They should be between -%10 and +%10 for both sides, and should bounce around a little. You can play around while watching these to find out where your vacuum leak is at. Or you may have another problem like too small of injectors or weak fuel pump or something else. I have a bunch of experience with these while they are living in their original vessels. The problems you are having may be related to some parameters being changed with the swap.
How does it run?
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Old 06-13-2019, 02:25 PM
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Psi programmed the wrong injectors in the first time then they redid them and still got the codes and last night I noticed I put the mass air flow flowing the wrong way. So I turned it around last night and reset the codes but I havenít ran it yet.
I called psi this am they said that it would give you lean codes or cause rich codes but more then likely lean codes

Sure hope that fixes it
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Old 06-13-2019, 10:08 PM
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All kidding aside and not knowing who 'psi' is, why don't you take it to someone that can tune it? If you do, then problem solved.

Too small of injectors causing a lean code at idle is a tune issue IMO. Changing the VE table in the idle area will take approx 10 minutes with HP Tuners.
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Old 06-13-2019, 10:16 PM
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Yea Iím going to get hp tuners when I can afford it.
Iíve also been debating on the Holley terminator x that self tunes.
Itís psi conversions they make harnesses and sell pcms
I couldnít find one in the wrecking yard so I baught one of theirs and they deleted vats and turned off all the sencers that throws codes that Iím not useing
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Old 06-18-2019, 09:40 PM
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I found out today they want 750 to tune and another 150 to put it in the Dyno Iím in the wrong field of work.
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Old 07-28-2019, 11:06 PM
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I had the car smoke tested and their was no vac leaks.
Still have the lean codes I bought blue driver so I can have live data but can’t post data
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Old 07-28-2019, 11:13 PM
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Here is pics
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Old 07-28-2019, 11:15 PM
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I took pics of the data log
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Old 07-29-2019, 02:53 PM
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Quote:
Originally Posted by 38 old coupe View Post
I found out today they want 750 to tune and another 150 to put it in the Dyno Iím in the wrong field of work.
Didn't notice this when you posted. Those are somewhat steep prices for the area I'm in, but not in metropolitan NYC/northen Jersey.

The Holley Terminator X is a good option, if you can afford it, as well as Microsquirt if you can handle the basics of tuning. In a factory car, then I'm all in with using HPTuners, but in a older car that the motor has been transplanted I'm a fan of the aftermarket stuff unless your HPTuner experienced.

You mentioned you were thinking of buying it, I'd recommend against it - there is a lot of training to go along with using whereas the aftermarket stuff is designed to be user freindly.
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Old 07-29-2019, 07:06 PM
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both long term trims are at 25%.
Is that the max they will go?
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Old 07-29-2019, 10:51 PM
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Yes 25% is max.
I was told to change the bosh o2s for denso or ac delco
So today I baught the denso ones and I unhooked the bat for a half hour and then installed the o2s it seemed ok tell it warmed up and went for a drive running 60 then decelerate then the ltft jump back up to plus 25 tell you give it gas again then the drop to 15 to 20percent plus.
One time I noticed the stft added 16% then the ltft went to 3.9.
I drove for a half hour and then I let it idle and then ltft went plus 25% and stft going plus 2 to plus 6 orso.
I’m sure it’s still learning but it it keeps the ltft maxes out it will set check engine light
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Old 07-30-2019, 08:04 AM
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Just a thought

https://ls1tech.com/forums/generatio...tft-maxed.html

Not your application but maybe a starting point.
Your stft look right, so no vacuum leaks. The problem starts when driving. It is going lean, so your injectors need to pump more fuel into the mix. I dont know much about tuning these, only carburetor...
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Old 09-11-2019, 01:05 PM
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Fuel trim is the % of fuel added or subtracted from the calibration in the computer, which is experimentally required to meet the desired air/fuel ratio.

Plot both B1S1 and B2S1 in Blue Driver and hold the RPMs at 2000 on a warm engine. Do the plots cycle up and down rapidly across 0.45V? If so, the PCM is controlling the fuel mixture at a ratio it is happy with. Note - only display the O2 sensor voltage plots, as monitoring too many things greatly decreases the sampling rate for individual items (and Bluetooth devices have lower limits).

Do you have an A.I.R system to inject air into the exhaust manifolds? If so, disconnect the check valves mounted in the manifolds. If you have an EGR system, you will need to figure out how to defeat that.

Now watch both long term and short term fuel trim values as you hold the RPMS at 2000. Long term + short term FT for a given bank should be 0% Ī 10%. If not, then one of two things needs to be done.

1) Use different injectors (in your case more flow would reduce the fuel trim values)
or
2) Recalibrate Fuel Trim so what is observed = 0%.


So what engine and/or injectors was the PCM calibrated for? Looks like they may have missed that one in the PCM that was sold to you. I would call the PCM company and discuss your findings.

Last edited by 2001Blazer4x4; 09-11-2019 at 01:13 PM.
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