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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » Help required - GM/Duramax Injector Balance Rate testing

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Author Topic: Help required - GM/Duramax Injector Balance Rate testing
r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 8, 2016 (GMT)

Well, WOW !!! and thanks.

I have had my scan gauge for almost as long as I have had the truck (since October 2003) and while I probably LOOKED at the X-gauge stuff as a “nice to have” benefit I had never got into it.
At 180,00 miles I replaced all 8 injectors (quite a driveway project) so that is what has sparked my interest in knowing the balance rates.

So, it seems I would have four or five character strings to enter, each about 12, 13 or 14 characters long, for each of eight cylinders – – and the only way to power the SGII on is to plug it into the truck.

It is now COLD here in Massachusetts and running a diesel on idle doesn’t make much heat, so I am trying to power the SGII from my laptop so I do the TEDIOUS stuff in comfort.
Bahh, it may LOOK like an ethernet plug and it probably IS an ethernet plug, but it isn’t getting POWERED from my ethernet port.
Bummer )-;

Well, of course not.
There is no POWER pin on ethernet cables.
The SGII almost certainly “expects” 12 volts from the OBD connector and its cable routes that to a pin on the ethernet like plug – – so I would have to make up cable to simulate that.

Probably going to
a) Wait for my BAFX adapter
b) Program the SGII when the truck is warm and I am waiting at a horse show for several HOURS.

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 9, 2016 (GMT)

As it turned out programming X-gauge codes wasn’t all that tedious.
The first one took a while, but after that the tip to copy and save to another location worked well. The only difference between cylinders is a single hex character in the TXD and RXF fields plus the name change.
Too bad the codes for ALL the duramax models aren’t available.

Dogface1SG
Member
Posts: 18
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 9, 2016 (GMT)

I am still searching for the LBZ numbers. 2001-2005 the balance rates work. In 2006 they changed over to the CAN system.

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 12, 2016 (GMT)

My BAFX arrived this morning, it pairs with my tablet and reads the ECU _ _ Yayy.

My 2003 LB7 according to X-Gauge has balance rates;
-0.9, 0.2, -0.8, -0.5, -0.1, 0.7, 1.0, 0.3
Which are FINE ! GM spec is under 4.

According to Torque they are all between 295 and 324 and don’t have anything like the same distribution.
Torque reads fuel rail pressure OK, also coolant temperature is about what I would expect.

I put them into a spread sheet to compare them to their average.
It was my understanding that deviation from the mean was what “balance” rate means (pun on “mean” – – nevermind)

The #1 and #8 cylinders are 4.5% above the mean.
Something weird is going on here and I am fairly sure that it is in Torque.

I have a PC version of ScanXL, but don’t know if this laptop can speak blu tooth, in fact I’m reasonably sure that it can’t.
I’ll try later, if/when the day warms up a bit.
===========================================
Re later duramii LMM, LBZ, etc.
I asked the scan gauge folk if there was a chance that they would provide X-gauge codes for them – no reply so far.

Capp777
Member
Posts: 2917
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 12, 2016 (GMT)

Assuming both are using the same pid… did you
try the equation on page 3 to see if results are
closer? Never mind… equation is mathematically
equivalent to what is included in Torque Pro.

((Signed(A)*256)+B)*(1/64)

Edited.

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 13, 2016 (GMT)

This morning I changed as much as I could of the UNITS to metric – this on the assumption that Ian is in a country that now uses the metric system(primarily) and the X-gauge notes say cubic millimeters per stroke.

I previously had ft lbs instead of newton meters and just about every other unit in Imperial (except US gallons).
If/when it warms up today I’ll try it.

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 13, 2016 (GMT)

The folk at scangauge replied to me.
Quote;
“We have XGauge codes for the LBZ and LMN, however, these models require a special software. Since they require a special software, the XGauge codes are not listed on our website. As for the LML, we are still working on furthering our XGauge availability. Do you have a GM LML vehicle? Would you be interested in testing?

We have kept our XGauges updated for Ford and Dodge vehicles.”
;End Quote

I don’t know what LMN is, other than a likely typo.
In any case it looks like they would like to have some testers.
{Nudge, nuge, wink, wink, know what I mean ?}

I will reply that my interest is mostly in knowing that any future Duramax I buy will be supported in X_gauges (true).

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 18, 2016 (GMT)

Quote from r on December 13, 2016
This morning I changed as much as I could of the UNITS to metric – this on the assumption that Ian is in a country that now uses the metric system(primarily) and the X-gauge notes say cubic millimeters per stroke.

I previously had ft lbs instead of newton meters and just about every other unit in Imperial (except US gallons).
If/when it warms up today I’ll try it.
==========end quote============

It did warm up (a bit) and I am pleased to say that changing units to METRIC worked.
I think the only thing I left “non-metric” was miles instead of Km.

Bahh, Humbug to these wretched mixed measurement systems.

Dogface1SG
Member
Posts: 18
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 25, 2016 (GMT)

I tried that on my 2006 (LBZ) still didn’t cut the mustard. Glad you got yours working.

You had the availability to just program your Scanguage with Xgauge commands to get B-rates. You can also program Injector Pulse Width.

Go to the Scangauge page and it gives you the inputs for Xgauge commands.

If you want to see them in Torque go to this link, http://www.tundrasolutions.com/forums/1gen-tundra/134700-guide-converting-scangauge-codes-torque-pro/ and it tells you how to convert the Xgauge commands to the info needed in Torque

r
Member
Posts: 14
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: December 26, 2016 (GMT)

I did do pulse widths and those were sort of fun to watch while driving (as a PASSENGER, that thing isn’t for watching while driving).

Under power, as expected higher numbers the more PULL is asked for.

On the overrun, they dropped to zeros.
Not quite what I expected, I thought there would be SOME fuel getting injected when using engine braking.

As the truck comes to a stop, picked up again to maintain idle speed.

Cute, possibly useful as a diagnostic tool or for verification that all is well.

I’m looking at new trucks again, my 2003 is VERY GOOD now that I replaced injectors, and it is nice to know that the injectors are well balanced, but it is still an “Old” truck.

I just wish that Torque could see “into” the ECUs on the LMLs.

ldkraemer
Member
Posts: 8
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 11, 2017 (GMT)

I’m getting balance rates on my 2003 Duramax (LB7) and
Injector Pulse width numbers of .3 to .5 ms in idle (Park)
with my Pro Version of Torque.

But, the Pulse width is in 100 millisecond increments, when it should be a two or three placed decimal value, instead of one. The 100ms steps are a too coarse increment to be usable.

Is there a way the data can be displayed in .xxx ms format?

This site explains the proper way to diagnose the Balance Rates along with how to use the Injector Pulse Width (.xxx ms) as a final check of the proper Balance Rates.

http://www.iatn.net/forums/12/64765/duramax-lb7-white-smoke-diagnostics

This above site also states that the Calculated Fuel Rate per Injection needs to be used along with the Balance Rate to know the true balance rate. Notice that at idle the injector should output approximately 5 mm3/sec as a typical value.

I’ve tried to locate the Fuel Rate/Injection PID, but so far
I haven’t located it. Does anyone know how to find this
PID? Is this value displayed on the Tech II?

With these changes, Torque Pro would be able to get the data required to follow the procedure at:

http://www.dieselplace.com/forum/63-gm-diesel-engines/7-duramax-first-generation-2001-2004-lb7/576505-proper-way-check-balance-rates.html

Thanks.

Larry

Capp777
Member
Posts: 2917
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 11, 2017 (GMT)

If you use a digital display you can
set the number of decimal places
by long pressing the gauge then
selecting display configuration.

ldkraemer
Member
Posts: 8
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 11, 2017 (GMT)

Capp777,
THANKS, I missed that altogether. I’m anxious to try it now.

Now, if we just had the Calculated Fuel Rate per injection
it would be perfect.

Larry

Capp777
Member
Posts: 2917
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 12, 2017 (GMT)

Is that anything like 015e which is already
in Torque Pro?

ldkraemer
Member
Posts: 8
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 12, 2017 (GMT)

Capp777,
I don’t have a PID that is xx015E or 015Exx.
What exactly is that PID?

I exported all my PID’s as a .CSV file, and I searched for a
string of 015E and nothing was found.

I just removed all my PID’s, and reloaded the GM ones, and then the Extended ones two days ago.

Larry

Capp777
Member
Posts: 2917
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 12, 2017 (GMT)

Long Name was Fuel Rate (direct from ECU). It is
a standard Mode 01 OBD pid.

ldkraemer
Member
Posts: 8
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 13, 2017 (GMT)

Capp777,
Nope, no such PID shows up like that on my Duramax (LB7)
list.

Larry

Hurtgen
Member
Posts: 1
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: February 7, 2017 (GMT)

Bump for LMM support

Kaluna00
Member
Posts: 1
Post Re: Help required - GM/Duramax Injector Balance Rate testing
on: January 11, 2021 (GMT)

I have been tirelessly looking for a way to display a LBZ injector balance rates utilizing torque. And have been very unsuccessful so far. Has anybody turned up anything I this?

I did see some formulas listed in this forum thread. I’ll be trying those out but I’ve seen those on other sites ( or something similar) and they did not work.
Thanks everyone!

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