[RainMaker]

Hey guys,

My long term fuel trims are stuck at .39 everywhere.

No, Im not that good of a tuner... (wouldnt that be godlike...)

Is there some situation where AirFuel Learning is disabled in closed loop indefinitely?

This actually looks like an issue that I need to call Cobb about.

Anyone?

[Christian.]

Originally Posted by RainMaker

Hey guys, My long term fuel trims are stuck at .39 everywhere. No, Im not that good of a tuner... (wouldnt that be godlike...)
Is there some situation where AirFuel Learning is disabled in closed loop indefinitely? This actually looks like an issue that I need to call Cobb about. Anyone?

You do not need to call us, it is likely that your ECU has found no reason to modify your fuel trims permanently (A/F Trimm Learned).

Take care,
Christian.

[RainMaker]

Originally Posted by Christian.

You do not need to call us, it is likely that your ECU has found no reason to modify your fuel trims permanently (A/F Trimm Learned).

Take care,
Christian.

I dont think Im so perfect at ironing out this intake calibration that NO long term fuel trims are necessary....

But if you insist...

[WolfPlayer]

Give it some time. You'll eventually see the LTFTs adjust a little bit. Your short term fuel trims are adjusting right? Now if THEY are also stuck at 0.39 then you have something to worry about - lol.

Do you have the 70mm and JECS installed now?

t

[JDM-STI]

Man, I wish mine would quit learning its negative correction...LOL

[Christian.]

I do not know if this is your issue, but the BigMAF is an intake which is impossible to tune. I would highly suggest changing that part first.

[RainMaker]

Originally Posted by WolfPlayer

Give it some time. You'll eventually see the LTFTs adjust a little bit. Your short term fuel trims are adjusting right? Now if THEY are also stuck at 0.39 then you have something to worry about - lol.

Do you have the 70mm and JECS installed now?

t

So what your saying is that my tuning isnt perfect... the ECU is just slow to criticize...

Yeah, the STFTs are VERY active I actually would appreciate calming those things down a little. No problems there. Although without STFTs and with a WBo2, you may have a problem, but you sure could map out the intake pretty well Hmmm... I wish I could turn them off like I can on the LS1 for a few minutes....

I dont have the Cobb 70mm or the Jecs in *yet*, though they will be going in soon, once I get through a few other priorities (wife is about to pop out 2.0, so I'm supposed to be helping her nesting fervor).

I also burnt out my Aquamist pump (PDX apparently was unaware that the pump cant pull water/meth from the back of the car to the front), so that will be a slight project coming up too. Lastly, Im trying to diagnose my AVC-R... which stopped working altogether... though I now have come to appreciate the hallman valve setup. I could wire back in the ECU to control the EWG, but 21psi seems so.... last month.

JDM-STI: As far as tuning with a BigMAF.... Holy crap... dont spend much time on that. You can only chase your tail so long before giving up. Cobb might sent you a 70mm Legacy GT intake or you could pick up the APS 70mm if you have room.

[JDM-STI]

Originally Posted by Christian.

I do not know if this is your issue, but the BigMAF is an intake which is impossible to tune. I would highly suggest changing that part first.

Get Scott Siegel to send you a picture of what I did to my big MAF. It made the MAF readings smooooth.
We are having to change to smaller injectors to solve my issues. We should have everything good to go by the end of next week. Hopefully...