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91 TBI Issues - Lean?

dyeager535 said:
Mark, it will set a code for lean even under WOT? I was under the impression (from my experience with my setup) that they wouldn't. Not saying I'm right, I just hadn't run into that before...I thought the O2 was essentially not used under PE conditions.
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I beleive it will! Good question I'll have to read how the test runs in the code and see... I've had them set but it ciuld have been not completely WOT! Pulling a trailer up a mountain Interstate grade is usually not WOT, well at least the way I tow... :dunno:
 
eagle mark said:
Pulling a trailer up a mountain Interstate grade is usually not WOT, well at least the way I tow... :dunno:
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I sure wish i didn't have to tow this way, but literally, there are some common spots where i'm below 30mph, and one particular grade i've gotten down below 10mph.

My truck is just low on power. Boat is only 4500lbs dripping wet and loaded, and i really don't carry all that much weight in the truck.

So, i do my best to keep the torque converter locked in OD when cruising flat highway, but as soon as I hit a grade, the pedal goes to the floor. :whistle:

Wish this wasn't the case, but its reality. I love this truck, but as soon as it won't get the job done that is asked of it, it'll be hard to justify keeping it around :dunno:
 
eagle mark said:
There's a beginner TunerPro RT Tutorial as a sticky in this forum, just start with the data logging side. The other side is all you need to tune a chip. Download TunerPro RT and I will email you a set of my files. PM me your email.
http://coloradok5.com/forums/showthread.php?t=302680

We encourage people to pay the $39 registration fee so the author keeps interest in updates. Try it out, the more you use it the more you'll see it's well worth the $39.

Cable installation got harder because of chips and new drivers, but it's all here:
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1557-Cable-Installation-to-TunerPro-RT

TunerPro RT is the best scan-tool and data logger you could have for these trucks! :waytogo:
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I'll get it downloaded, and let you know if i have an issues. I will also pay the reg fee.

I'll PM you my email. THanks!
 
TunerPro is fun to play with. Just bringing it up and seeing the functionality is exciting, but actually using the display of the operating conditions of the system is amazing. MPH, RPM, temp, O2 values, MAP you name it, all there and pretty much customizable to however you want it.
 
Sweet. Cable showed up today. My laptop with dysfunctional battery is a good motivator to remount my inverter, and get this software loaded.

If all goes well, I'll have questions tomorrow.

Jumped in the truck after work, and really, the damn thing runs well. Warms up really slow, and runs fine. Can't wait to figure out what the cause of the running hot is
 
So, went to double check I have no codes, and my cel light isn't lighting at startup. My light may be burnt out

That being said, I definitely had a light on briefly last weekend, so if it is burnt out ,this hasn't been a long term thing.
 
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Ok, so it was one of those days.

Got the CEL working. Not sure what the deal was, but it works now.

Checked stored codes, just #13, O2 sensor, as expected.

Worked on getting tuner pro and the cable up and running, but the cable software isn't working, and i'm stuck on Tunerpro.

I walked through the tutorial steps, but don't know what to do next. I tend to be VERY computer savy, so i'm pretty pissed. Hm.
 
Sorry I missed your PM? Sent you files for data logging (ADX) and changing chip/bin file (XDF). Gave some brief instructions to help. With them, read the tutorial again.
 
If it helps any, I can verify the temp difference between the port in the head and the one on the intake. My intake reads 195 while the head reads 165.
 
bp71k5 said:
If it helps any, I can verify the temp difference between the port in the head and the one on the intake. My intake reads 195 while the head reads 165.
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Hm. That is a bit scary. Cause my 235 reading is at the head.

I hit almost 215-220 cruising the freeway unloaded yesterday. wtf.
 
eagle mark said:
Sorry I missed your PM? Sent you files for data logging (ADX) and changing chip/bin file (XDF). Gave some brief instructions to help. With them, read the tutorial again.
Click to expand...

Thanks Mark. I'll let you know how it goes when i get back into it.

I think its a PC issue more than anything else.
 
I had some problems getting the TBI (7747 ECM) to connect that I didn't have with TPI and the same laptop, so I wouldn't be surprised if it's something pretty simple. Mark can certainly help with that more than I.
 
So far, the issue is getting the drivers on the cable to load. I havent' actually tried to get it to connect yet. Hopefully i can play with it later tonight.
 
Well, i was successful. AND, the little tiny cigarette lighter inverter was enough to keep the computer alive.

See attached files. Just ran around town and jumped on the freeway, but never got the dash gauge above 200 or 210.

Curious to see if there is anything weird that shows up now. If not, i'll log it during the tow this weekend. Stoked to get it running.

Thanks for your help mark, and others!


https://drive.google.com/file/d/0B6EAl9ePEdv9Z09Wa2pJTk1SeC1HSTA1YlJZMVBZRTF4OHRz/edit?usp=sharing
 
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So, I played around with the recording a bit.

Is the o2 value supposed to jump all over the board like that?

That was the really only abnormality that jumped out at me.

To refresh, i'm running flowtech shorty headers and a 3 wire AC delco o2 sensor.
 
Nothing in data to show overheating... unless running rich counts? Usually that will keep it cooler. But you are at MAX low BLM of 105 most of the time warmed up. You should turn that pressure back down to 13 PSI.

Also clear code 13 from when you had O2 sensor disconnected. Make sure it does not come back.

Yes the O2 sensor is supposed to do that, it's called Cross Counts and the ECM does that for Cat Convertor.
 
Mark,

Definitely didn't get warm during that test drive, was more curious if anything was standing out that would cause overheating in a loaded scenario.

Where in tunerpro can i see error codes? I'll clear the code manually before i log during my friday tow.

Did a little research, and see what you are referring to on BLM. What's it actually stand for?

Before I log 4 hrs of data, is there any "best practices" to get good logs?

Are short/long logs more helpful, does it cut off after a set time, do you want it from cold start? Only want to focus when it starts to warm up?

I'm guessing the "dash" i'm showing in turnerpro doesn't actually effect the data that is being logged, correct?

Thanks for all your help!
 
That's what makes me suspicious of the o2. The fact that it's forcing the computer to take as much fuel away as possible. I know the pressure is bumped up and I know it didn't effect the over heating but iirc, the computer wasn't cleared before towing with the sensor un plugged. Meaning it would still run at the last known o2 readings which would still place it into maximum lean.
 
Blm is "block learn multiplier" if I remember right. And it's the thing that stores the memory of how much fuel to add or take away for a given set of parameters. In other words, say your at 20% throttle, 2800 rpms, 200 degrees, etc. The o2 sends info to the computer and let's it know to add or remove fuel. At some point, it finds its happy spot. Maybe the happy spot was to take away 10% of fuel from default settings. That gets saved in the ecm as a Blm number. So that next time your St those parameters it can just jump straight 10% fuel take away.
 
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