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What is your line of work exactly? Do you work with PSIG or PSIA? I believe that is the difference. Gen4 fuel systems are 58 PSIG (400 kPa).

Correct! A write entire using HPT from a compatible M6 CTSV file did the trick!

Thanks for sharing these...I see that two of these files does indeed have [ECM] 822 mapped.

Ok thanks. That was a shot in the dark as the cause. We're trying to source an M6 E67 now.

Yes that seems to be the issue alright.

I am curious though if ECM 822 is (usually) mapped on an M6 OS by HPT or if that is only a GMPP OS thing.

Just an FYI, we got the ECM and stabbed it in and the car fired up right away! Thank you edcmat-l1!!!

Now this has created a new issue in that the ECM is reading a constant 158 mph which is...

You can download the log file in this post for an example:...

Closed Loop = Stoich -> narrowband O2 sensors
Open Loop = Rich* -> wideband O2 sensor
*note an exception that after start up the car may be in OL before switching over to CL and the ECM is...

OK so it sounds like the other segments (unreachable by HPT) would need to updated. Hence SPS flash.

To be clear, we did not do a write entire from the GMPP source ECM. We did a read of the OEM ECM, made normal tuning changes in HPT (including disabling VATS), and then did a write entire. The GMPP...

Would any GM programming be required for a swap? I am hoping we can read the CTSV E67, compare/copy settings from the existing crate E67 (and disable VATS), then do a Write Entire. Is more needed?

Correct. The big gripe is being locked out of setting idle RPM.




Yes a write entire was performed. I will suggest a CTSV version. Any good sources for those?

I am helping someone out with an LS swap. Car had a GM crate E67 (newer 127 lb/hr limit) and was running fine. Guy bought a used E67 (older with 63 lb/hr limit) from a V6 and swapped it in. I copied...

GMVE is not a log-able parameter. It is a made up term/idea/concept. You need to create your own custom math parameter and then chose a name...which people universally call "GMVE".

Of late the...

If there was free one stop shopping to learn everything about tuning, all the pay to learn tuning schools out there would be out of business.

So you have three paths:
1) try to get all the free...

Just post them here.

The correct way is going to involve a dyno and lab grade emissions testing equipment IMHO.

There several different ideologies and methods. It is something I have spent considerable time on and put...

Can you elaborate on this please? Are you saying for any Gen4 ECM (N/A or Supercharged) to leave all OEM values alone? What kind of bug do you see? Is it the fuel spike like when you fail the MAF?

This is most likely being caused by not logging a PID that is referenced in the filter. You can add or remove each element of the filter and watch when the chart changes....or you can watch this...

So perhaps Allen you can try setting this table back to stock as a test
[ECM] 33030

Seems like a good way to test this would be to poke around on the fuel tab and tweak the Low/Med/High flow definitions and possibly the Fuel Pressure Transition Rate values.

Also, has anyone...

Hilarious LMAO
144465

I too have a '14 Chevy SS (Holden). Passenger side (B2) is always about 5% richer. It has done this with different sets of heads, intake manifolds, fuel injectors, replaced O2 sensors/swapped them...

Has anyone logged the EVAP commanded duty cycle to compare against these lean spots yet?

After looking at the log I don't see anything that really jumps out. You can do a quick and dirty experiment and decrease the Proportional and increase the Integral to see what happens. What you need...