Newbi questions on tuning LQ4

[jemarshall64]

I am finding some odd things that I am having a real hard time to figure out with trying to get my engine tuned. Specs on the engine are in my signature. I had the PCM tuned by a reputable shop, but for some reason I am unable to get him to respond to any type of contact. It has the base tune he put together off of the specs I gave him, but it was never fine tuned. I finally got a wide band in it and took it out for a day trip and it has some major issue. Anything around 40% percent throttle and up is so lean it maxes out the wide band, and will not come back into spec. I will try and list out the main ones I am lost on and see what everyone thinks.

The PE settings were at 100% throttle and the Hot temp was maxed to 285. I adjusted them to 60% throttle and 150 Deg F.

The primary VE tables cells all have a 1 in them.

The PMC/Operating system is pretty old and I cant find anywhere where it says how to disable the MAP. I went through what I could find on how to do the initial setup for base tuning the VE table's, but I am not given the option to change the Mass Air Flow Freq High, the box is not there for me to do it. I unplugged the MAF and then it will not even idle.

Closed Loop Enable, ECT vs IAT, is set to max 285. Will this not keep it from entering closed loop?

Under Fuel - Open & Closed Loop - LTFT Enable, he has it disabled. I would think it would have to be enabled to learn



I am a little leary about taking it for a drive if the VE tables have no actual data in them, and I am really unsure where to start there.

How can I force it into SD/OL if I cant get the MAF to fail out?

There is some more, but I am working night shifts and running on very little sleep, but this is the first main bulk of it. I took a couple reads with it just firing off and idling, one on the default tune it came with and one with the initial setup I did. Please let me know if you can see anything I need to change, or what I need to do to get this thing going in the right direction. The plan right now is to get it out somewhere where I can run it Saturday and try to do some data logs on it.

[jemarshall64]

I realized that I did not get the MAF changed to first time on in the diag section. Fix that and then went out and tried it with the MAF unplugged again. It would start and idle this time. Its running very rich doing it that way, and the LTFT and STFT are only populating with 0's, which I do not understand.

[Earwax]

You should read everything you can find on this site concerning tuning.
Just use the search box,there is alot of great info here to help.T
There are also some good guides available on the web.
I see that the VE is populated,it looks a little rich.
The PE Power Enable EQ Ratio is set to 1.
Do not use WOT until this is changed. It needs to be set to around 1.17, which would give you a A/F of 12.5.
Currently it has no power enrichment. Current tune 14.68 (stoich) /1 (PE EQ)= 14.68.
Should be around 14.68/1.17=12.54.
I would also raise the PE Enable MAP to 75-85 kpa from the current 55 kpa.
Closed Loop Enable, ECT vs IAT, is set to max 285. Will this not keep it from entering closed loop?
Yes, change it to 130*.
I am not given the option to change the Mass Air Flow Freq High, the box is not there for me to do it.
It is in Engine Diag>Airflow>MAF>MAF Frequency Fail High.
Enable LTFT
The MAF has the IAT sensor in it.When disconnected, it reads like -40* and goes rich among other things.
You also need to log these channels:
O2 sensors (B1,B2,sensor 1),Inj pulse width (B1,B2),Inj duty %,Knock Retard
There are other things that I may have missed,but this should get you started.
The experts on here will gladly help you.

[jemarshall64]

Thank you for the reply, I'll address what I can right now.

You should read everything you can find on this site concerning tuning.
Just use the search box,there is alot of great info here to help.
There are also some good guides available on the web.

I have read and watched so much in the last 2 weeks, I think I have gotten to the point where I am saturated and starting to get things mixed up

I see that the VE is populated,it looks a little rich.
The PE Power Enable EQ Ratio is set to 1.
Do not use WOT until this is changed. It needs to be set to around 1.17, which would give you a A/F of 12.5.
Currently it has no power enrichment. Current tune 14.68 (stoich) /1 (PE EQ)= 14.68.
Should be around 14.68/1.17=12.54.

I thought I had changed that to 1.2. I already shut the laptop down for the night but will check it first thing tonight when I get back to work. Thank you

I would also raise the PE Enable MAP to 75-85 kpa from the current 55 kpa.

Closed Loop Enable, ECT vs IAT, is set to max 285. Will this not keep it from entering closed loop?
Yes, change it to 130*.

Enable LTFT

The MAF has the IAT sensor in it.When disconnected, it reads like -40* and goes rich among other things.

Noted


I am not given the option to change the Mass Air Flow Freq High, the box is not there for me to do it.
It is in Engine Diag>Airflow>MAF>MAF Frequency Fail High.

This option does not show up for me, in the diagnostic section it only has a list of the DTC with the drop menu to change between first/second key on and the SES light check box, there are no other tabs or menu's


You also need to log these channels:
O2 sensors (B1,B2,sensor 1),Inj pulse width (B1,B2),Inj duty %,Knock Retard
There are other things that I may have missed,but this should get you started.
The experts on here will gladly help you.

I did go back and add the O2 B1/B1 S1's already but will get the others added tonight.



Again, thank you. Any advice or direction will help tremendously.

[jemarshall64]

I am not given the option to change the Mass Air Flow Freq High, the box is not there for me to do it.
It is in Engine Diag>Airflow>MAF>MAF Frequency Fail High.

Found this, guy I work with came in and told me that there is a basic and advanced view in the editor. Now I just need to figure out of to get the OS button to show stuff in it when the widow pops up.

[5FDP]

The advanced view is under the edit tab if you hadn't found it yet.

The OS you are using won't have any options under the OS tab because it's already an OS that can support boost, there is a boost VE table under the Airflow tab already.

[jemarshall64]

Ya, he showed me this morning before I headed home. Thank you, just never even thought that there was something like that to look for.

Made the changes and will go out in a few and do an idle read.

Good to know on the OS button, thank you.

I was not able to find injector duty cycle to add it to the channel list.

I still am not seeing anything in the VE tables but a 1, I attached a screen shot of what I am seeing.

[jemarshall64]

Much better with the MAF hooked up/disabled. IAC is running really high now, where with the initial tune I had it set right at 75, but I am figuring that that will work itself out with tuning and will probably need reset at some point anyways.

After it got to 135 I did finally see number instead of 0's in the LTFT and STFT.

I attached a run of it from cold start until the fans kicked on. Tapped the throttle a few times at the end.
I also attached the current Editor file.


Please let me know what you think, especially on the VE tables please.

[5FDP]

Duty cycle is a math function of injector pulse width, add both banks of injector pulse width and duty cycle will appear.

As for the VE table you need to change the units back to "percent", right click and down to unit, click % and it will appear as normal again.

[jemarshall64]

The learning curve on this for me is a little steep, but I think its starting to come together. Thank you very much.

[jemarshall64]

Digging around trying to verify my injector data, seem different than everything I have found. Putting this here to save it as it seem to be exactly what I need.

https://www.hptuners.com/forum/showt...-Injector-Data

[cobaltssoverbooster]

the stock 6.0 injectors are shared with a few other engines... most of which have different injector data even though the part numbers are the same. its a problem im running into now. i ran my part numbers and found 4 sets of base data.

[jemarshall64]

That's what I was seeing. Different sites listed different data, and opening other tune files that should have had them in them also listed different data. When I was trying to copy and past that info into my tune file it kept changing the numbers a little bit for some reason I cant figure out, so for now I just put it back to what it was in the original file. I am going to go with what was in there and hope that the guy who set it up originally got it right for now.

[IARLLC]

Looks like an awesome project!

I wonder if the differences in injector info is because they were offered on different set-ups (return style with vacuum style regulator,return-less,etc)? If you are using the regulator that the injectors came with I would use the data from that application for sure. Maybe this is obvious and not helpful but...My 03 Tahoe came with a Flex 5.3, now has LQ4, so I just put the Flex injector info into the LQ4 tune when I started setting it up.

Rainier Oregon or Washington? I am originally from Rainier Oregon. It is extremely strange to even see the name.

[jemarshall64]

Thank you

I don't think it has to do with the style of fuel system. By the time they started using this injector everything was return-less from what I can find. Maybe something that has to do with the displacement and/or intake, or just a difference in tuning for different HP levels stock. I really cant figure that part out.

Oregon. I grew up in Knappa, left this part of the country/world for a while and eventually came back here. Working at a power plant on the Longview side now.

[IARLLC]

Cool! Welcome!

Yeah, you are totally right. All were "return-less" before that time. I am just thinking out-loud here but it might have more to do with the style of pressure control anyway. Just remembering Vettes that used a return at the filter to control pressure as compared to Suburbans that recirculated the extra fuel inside the pump housing...maybe.

[cobaltssoverbooster]

6.0 got returnless fuel in 2004 via the denali packages

[jemarshall64]

My original plans for this afternoon fell through so I took it out and found some logging roads I could run around on. Logs are not very long due to issues with laptop battery/trans temps/amount of time to play/still trying figure out what in the hell I am doing.

I messed up somewhere on the intial setup and did not get the PE disabled,and I think it was making every thing very erratic when doing the VE tables. I ran a few trips and was working on them and then went to do a MAF run. On the MAF run it was spiking the O2 out of range like I had been seeing when I made the first trip after installing the wideband. After the first MAF run I figured to turn it back on and that is when I found that it was not dissabled. Did some changes to the MAF and a couple runs to get it pretty closed. I then did a couple more runs for VE with PE off and added them in there. Still needs allot of smoothing out,but it is much better than it was, and with the MAF enabled it keeps the O2 "OK" now. If I can get the new trans cooler mount installed tonight I will try and get some runs in tomorrow. For now I am going to data dump the files for today. If any one would look at them and give me some pointers it would be a huge help.

As a side note, right now the butt dyno says this thing has a ton more power in SD, it will spin all 4 tires on every shift. With the MAF on it will pull hard, but not nearly as hard as SD. In 2wd its almost fookin scary.

[jemarshall64]

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[jemarshall64]

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