pcmhacking.net

Posted: **Thu Sep 01, 2022 5:20 pm**

I am a noob first swap learning on the go so if I say something ignorant it is because I have never done this before.
I am running a 12212156.bin (from BoredTruckOwner) I customized with a licensed copy of TuneProRT flashed with LS Droid and a OBDXpro.
1. The truck runs rough at cold start with the 12212156 tune

2. I keep getting code on torque pro P0174 lean bank 2 (red) & P0171 lean bank 1 (yellow) not sure what is going on but I am thinking it is the 12212156 tune

When I run the original LM7 9373372 tune it lifter rattles at start but runs smooth
I get no lean codes (I do get O2 bank 1 sensor 2)
Since 12212156 is written for a stock 2002 LM7 and this is a stock 1999 LM7, Maybe there are differences in the fuel systems?

other changes
unchecked B1901 - Maximum Allowed Engine Torque under toque limiting

P1638 Alternator ‘F’ terminal -circuit malfunction Wiring open circuit/short circuit to ground, alternator, ECM
P1638 3 0 Battery light on Message center Not present in 1999

Oxygen sensor
P0137 Heated oxygen sensor (HO2S) 2, bank 1 -low voltage Exhaust leak, wiring short to earth, H025, ECM
P0138 Heated oxygen sensor (HO2S) 2, bank 1 -high voltage Wiring short to positive, H025, ECM
P0139 Heated oxygen sensor (HO2S) 2, bank 1 -slow response Heating inoperative, wiring, H028
P0140 Heated oxygen sensor (HO2S) 2, bank 1 no activity detected Wiring, heating inoperative, H028, ECM
P0141 Heated oxygen sensor (HO2S) 2, bank 1 heater control circuit malfunction Wiring, H025, ECM
P0157 Heated oxygen sensor (HO2S) 2, bank 2 -low voltage Exhaust leak, wiring short to earth, H028, ECM
P0158 Heated oxygen sensor (h025) 2, bank 2, -high voltage Wiring short to positive, HO2S, ECM
P0160 Heated oxygen sensor (H025) 2, bank 2 -no activity detected Wiring, H028, ECM
P0161 Heated oxygen sensor (HO2S) 2, bank 2, heater control -circuit malfunction Wiring, HO2S, ECM
P0167 Heated oxygen sensor (HO2S) 3, bank 2, heater control circuit malfunction Wiring, HO2S, ECM

EVAP

P0442 Evaporative emission (EV AP) system -small leak detected Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
P0443 Evaporative emission (EVAP) canister purge valve circuit malfunction Wiring, EVAP canister purge valve, ECM
P0444 Evaporative emission (EVAP) canister purge valve open circuit Wiring open circuit, EVAP canister purge valve, ECM
P0446 Evaporative emission (EVAP) system, vent control -circuit malfunction Wiring, EVAP canister purge valve, ECM
P0449 Evaporative emission (EVAP) system, vent valve circuit malfunction Wiring, EVAP canister purge valve, ECM
P0452 Evaporative emission (EVAP) pressure sensor -low input Wiring short to earth, EVAP pressure sensor, ECM
P0453 Evaporative emission (EVAP) pressure sensor high input Wiring short to positive, EVAP pressure sensor, ECM
P1410 Evaporative emission (EVAP) canister purge valve -circuit malfunction Wiring, poor connectios, EVAP canister vent valve, ECM
P1441 Evaporative emission (EVAP) system -leak detected Hose connection(s), EVAP canister, EVAP canister purge valve

Posted: **Fri Sep 02, 2022 12:26 am**

I think your issue is that the 1999 and 2002 LM7 had different size injectors. I'm attaching a bin that has 1999 injector data in a 2002 bin. Hopefully this can get you going in the right direction.

Posted: **Fri Sep 02, 2022 12:45 am**

That was kind of my guess, First or all I thank you for your help. I want to know, are the injectors the only change in that bin? How did you change it? The fuel tables or something?
My son and I really want to learn how to tune this PCM. Not to be a "tunner" or for any monetary reason. Just a car nerds that like to know how things work. I have a buddy that wants to swap his camaro and I have another 1979 firebird that is a roller that I want to build.

Posted: **Fri Sep 02, 2022 1:25 am**

Maybe should have posted this to begin with this is the modified bin I was using

Posted: **Fri Sep 02, 2022 5:50 am**

User TunerPro to compare your “Latest Mod” bin with the one provided by Phoenix to see what he has changed.
I expect it will be the injector size and also the battery offset values for the injectors. There may also be a couple other things depending what is identified in the XDF.

Posted: **Fri Sep 02, 2022 12:46 pm**

Yoda69 Thanks for your help

Thank you I just watched a youtube by P locky on how to do that https://youtu.be/GHn4JW41eFk
there are changes in B3701 - Injector Pulse Width Voltage Adjustment for the first 4 rows of MAF the voltage is increased (does that mean it sprays more?)
Just like you said also some changed values in the fuel injectors
What is confusing to me is the
overall voltage is increased by a factor of 1
B4001 - Injector Flow Rate (Grams/sec) is reduced by 0.44 down the table isn't that less fuel?
What am I missing

Posted: **Fri Sep 02, 2022 11:07 pm**

The stock 1999 engine has 21 lb/hr injectors, the stock 2002 engine has 25 lb/hr injectors.

The engine you have is from a 1999, so you have 21 lb/hr injectors. Those will spray less fuel per amount of time than the 2002 injectors that the tune thinks you have. So telling the tune you have smaller injectors will richen it.

Since we know all the injector data for the ones you have installed I swapped it over to the 2002 tune.

I opened a 1999 tune in HP Tuners to get the data and copied it over.

Posted: **Sat Sep 03, 2022 1:10 am**

Phoenix wrote:The stock 1999 engine has 21 lb/hr injectors, the stock 2002 engine has 25 lb/hr injectors.

The engine you have is from a 1999, so you have 21 lb/hr injectors. Those will spray less fuel per amount of time than the 2002 injectors that the tune thinks you have. So telling the tune you have smaller injectors will richen it.

Since we know all the injector data for the ones you have installed I swapped it over to the 2002 tune.

I opened a 1999 tune in HP Tuners to get the data and copied it over.

Pheonix

YOU ARE AMAZING
Thank you for taking the time to explain it to a dumb noob

Posted: **Tue Sep 06, 2022 3:22 am**

Well crap codes came back now its P0174 lean bank 2 (yellow) & P0171 lean bank 1 (red) turned on check engine. But when I had torque re-scan the codes were not present but check engine was still on. I am wondering if they were thrown in open loop? or maybe I need to change or something else. I thought about some injector cleaner (44K) but I do not get these with the stock bin LM7 9373372. So I am convinced it is the tune.
long story
I have replaced the fuel filter, and pressure regulator and fixed all the vacuum leaks with new hoses a couple of months ago when the fuel pump gave up. I had 10PSI at the rail then, now, I have 55 to 62 PSI at the port I can't remember the exact number but I think I set it to 58. I have used seafoam in the tank. So I am convinced it is the tune.

Posted: **Wed Sep 07, 2022 1:23 am**

Are you logging fuel trims and O2 mV? What are the values you are seeing?

pcmhacking.net

12212156 lean bank 2 (red) & lean bank 1 (yellow)

12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)

Re: 12212156 lean bank 2 (red) & lean bank 1 (yellow)