Newbie. Need help tuning after installing a mild cam.

[bluething]

Hi Everyone, before I start asking questions, Id like to give some context on my build.
MOTOR:
- 1981 GMC Caballero, Gen 4 5.3 LS swap. Standalone harness and E38 PCM by PSI Conversions. AFM deleted of course.
TRANSMISSION:
- 15 pin 4L60. No park/neutral saftey switch is used on my build. Everything else is still there.

Now that's out of the way, I installed a mild cam from scoggin dickey called the "hot truck torque cam." (SDPC LS Camshaft 205/210 .550/.525 115) My PCM was tuned for a stock application by PSI conversions. Car runs well, but it gives me P0171 and P0174 codes and likes to run the rpms up as long as the vehicle is moving. The rpms will jump up to at least 800 as long as the vehicle is moving no matter what gear, and in neutral while coasting down a hill the rpms will rise higher in correlation with how fast i'm going. Id like to get rid of it please. Once I stop moving it sits at 800 for a moment and then lowers the rpms back down to 600. It's Kinda like the throttle cracker effect the gen 3 guys deal with. Only problem is gen 4 is special and does not have the throttle cracker function.
- Regarding the engine codes, Ive checked the motor for vac leaks with a smoke machine and sprayed carb cleaner around to find any, and nothing came up. I'm pretty sure the cam is causing the lean condition. My fuel pump is a holley 350 lph in-tank pump. Returnless style with corvette filter.
- Ive checked out the scanner tool and its awesome! It fun to play around with the diagnostics and see live statistics from my pcm. Like how the LTFT is run all the way up at idle... Ive reset it a couple times to see what happens and my car begins to surge and chug until the PCM adjusts the fuel to adapt to the lean condition.

I need help tuning so my truck will stop dumping fuel into itself, where should I start? And fixing rpm increase while moving?
By the way, Here is my tune setup I got from PSI Conversions. Please let me know what needs to be done and any tips please. I'm still learning all of this so please assume I know next to nothing.
1981 GMC Caballero Tune.hpt

Thank you!

[blindsquirrel]

There's more than one "Gen 4 5.3", is it a LY5 from a 2008 Silverado as the tune file says, or one of the many other 5.3s that use different parts with different specs (injectors primarily, but also MAP sensor, MAF, etc.)?

MAF table has been changed from stock, but were those changes made through tuning, or just changed based on vibes or whatever? I really doubt you used any of the stock intake plumbing or air filter box in a swap like this, and changing any of that stuff throws the stock MAF calibration completely out the window. Not something you can tweak here and there and say "that should be good enough for whatever's changed, let's ship it".

No log files that show it doing the things you say it does?

[bluething]

There's more than one "Gen 4 5.3", is it a LY5 from a 2008 Silverado as the tune file says, or one of the many other 5.3s that use different parts with different specs (injectors primarily, but also MAP sensor, MAF, etc.)?

MAF table has been changed from stock, but were those changes made through tuning, or just changed based on vibes or whatever? I really doubt you used any of the stock intake plumbing or air filter box in a swap like this, and changing any of that stuff throws the stock MAF calibration completely out the window. Not something you can tweak here and there and say "that should be good enough for whatever's changed, let's ship it".

No log files that show it doing the things you say it does?

The motor is an all aluminum LH6 that came from a 2007 GMC Envoy Denali. Im currently using the DELPHI #AF10043 MAF, a trailblazer ss intake, ACdelco 2bar MAP sensor, and 30lb EV6 Injectors that came on the motor when I bought it. When I bought the PCM from their website is asks what kind of motor you have, injectors, and MAP and Intake manifold type, among other specifics. Pretty much asking what is on my motor so they can apply it to my PCM. Intake plumbing however, is a different story. I bought an Amazon cold air intake that came with couplings for my MAF. Starting from the throttle body I mounted the MAF after a short 90 degree elbow (with the MAF pointing the correct direction) and the rest of the way was pipe and a cone filter going to the driver side fender. Also, how I do to access the log file?

[edcmat-l1]

What do you mean "How do I access the log file?" Have you data logged the vehicle? If not, you need to. Then post the data log here like you did the tune file.

If you DID data log the vehicle but now can't find the data log, search Documents/HPtuners/VCM scanner/Logs. It should be in that folder.

[bluething]

Ok. Figured out how to make a log with the scanner. This is just from street driving and driving on the interstate. Fastest I went was 100mph.
1981 Caballero log1.hpl

[LS ROB]

That would have been a great log if it had useful data in it. Add Cylinder Airmass, Dynamic Airflow, Volumetric Efficiency, Injector Duty%, Injector Pulse Width Avg. B1 & B2, o2 sensor B1S1 & B2S1, Manifold Absolute Pressure, MAF Sensor to your scanner channels.

[bluething]

ok. Did another log with the new channels.
1981 Caballero log3.hpl

[LS ROB]

Good deal. Now get one that is a little longer like the first one. The trims are just starting to settle after 15min of driving after a flash. See if this helps.

1981 GMC Caballero Tune-1.hpt

[bluething]

Thank you. Ill give her a run after I get off work

[bluething]

Heres the latest. I Let the car idle for a bit to get some data on that too.
1981 Caballero log4a.hpl

[LS ROB]

Give this one a go. Made some pretty good sized changes to the MAF and VVE. Still looking lean.

1981 GMC Caballero Tune-1.1.hpt

[bluething]

Took a drive with the tune. Doing better. P0171 and P0174 codes are gone but LTFT is still hanging on the high end a bit.
1981 Caballero log6.hpl

[LS ROB]

Yeah, your trims were really lean to start with. The tune will take a good amount of cleaning up but its getting a little closer.

1981 GMC Caballero Tune-1.2.hpt

[bluething]

Heres the log. Getting closer, but its hesitating a bit when I first put my foot on the gas from a stop. I appreciate the help!
1981 Caballero log7a.hpl

[LS ROB]

Get a longer log. Afraid to make adjustments off of that one. Remember, it takes at least 15min after flashing a to let the trims start settling. Oh and if you need to get gas; stay with the same octane rating.

[bluething]

Get a longer log. Afraid to make adjustments off of that one. Remember, it takes at least 15min after flashing a to let the trims start settling. Oh and if you need to get gas; stay with the same octane rating.

Gotcha. Ill update you sometime today.

[bluething]

1981 GMC Caballero log7b.hpl
Here's a longer log. Car still bogs out a bit after first hitting the gas.

[LS ROB]

The fueling still isnt dialed in which is why there's drivability issues. Once VVE & MAF gets dialed in, most of your issues will be solved. It's already took care of the lean codes you had from being really lean when you started. I made more adjustments to the VVE and MAF. How sure are you that you don't have a vacuum leak? Exhaust system all there or open headers?

1981 GMC Caballero Tune-1.3.hpt

[bluething]

The fueling still isnt dialed in which is why there's drivability issues. Once VVE & MAF gets dialed in, most of your issues will be solved. It's already took care of the lean codes you had from being really lean when you started. I made more adjustments to the VVE and MAF. How sure are you that you don't have a vacuum leak? Exhaust system all there or open headers?

1981 GMC Caballero Tune-1.3.hpt

I have a full 2.5'' catless hooker exaust, part no. BH14307. I checked the motor for vac leaks twice with a fogger. No vac leaks anywhere.

[bluething]

1981 Caballero log8.hpl
Heres the latest log.