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I upgraded my serial interface to the MVPI Pro and now I get the same error on a 2004 GMC Sierra 5.3l.

I bought the truck new and the only tuning that was ever done on it was done by me with...

Nevermind, I was able to pull the misfire history using Vehicle Explorer from OBD-2.com.

I had a few misfires on most of my cylinders and 5000+ on #5.

Looks like my Magnecor KV85 on #5 split...

OK, I grabbed the data from the truck and looked at it in the editor but I don't see exactly what you said. I don't see an option to Add DTC anywhere.

In the VCM Editor Engine Diagnostics section...

Great, thanks for the info! I will have to give that a try and see where it thinks the problem is.

Thanks again,

Shawn

In the Scanner is it possible to see the misfire counter by cylinder? This is in a 2004 Sierra 5.3l.

This morning my truck started misfiring badly (MIL flashing) but the only code I get is a...

Where are you talking about spark retard?

In the editor I see spark retard settings for knock, traction control and maybe torque management.

The first two are under engine in the spark retard...

Keith,

Thanks glad to hear it.

What I'd *love* to see would be something like an auto logging/naming mode.

When you turn that mode on the software would ask for something like a file name....

Any chance later versions can change the space bar to turn logging on off instead of turning scanning on and off? That would be much more useful to log just the data from a single run.

Shawn

While I don't think a program could self tune everything during closed loop operation, self tuning the mixture should be possible. After all that is basically what the VCM is doing dead stock by...

" The simplest way to disable the effect of knock learn is to set the HO table the same as the LO table."

If you do this does this mean you have disabled the knock sensors completely (or is it...

" Hmmm... no, the high and low octane tables all have the
same 1.20 gm/sec maximum index. That's kooky. "

Now we are on the same page.

The index is actually listed as g/cyl which is why I was...

I don't have my logs (or the software) in front of me but I think I saw around 30lbs/min max airflow. By the above that works out to about 227gm/sec.

However that still doesn't solve my question....

" It looks like the scanner however logs in lb/min so you
would have to convert units (probably in Excel) or maybe
you get gm/sec if you select the Metric basis?"

Right, that is basically my...

In the low and high octane spark map tables what is the airflow axis based on from the scanner? Is that airflow in seconds, minutes or ??

Basically I'm just trying to figure out which map point...

Thank you very much.

I'll post the same from my truck tonight if anyone is interested. It is almost comical the timing setup in it. On the high octane map there are actually points ATDC and in...

It is a 2004 GMC Sierra 5.3l, 4x4, automatic.

Shawn

" But the trucks have a tow/haul mode so maybe it's still
lurking on the PCM connector somewhere. "

I'm still waiting on Helm to release the 2004 service manuals for my truck. After I get that I...

" You will notice 99% of your errors from a USB to Serial converter will occur during a read. "

Thanks for the info. I had no problem reading out my 1 meg binary at high speed so it looks like the...

This is the model I have been using so far:

http://www.keyspan.com/products/usb/mpr/

If you were using other logging equipment at the same time that needs a serial port this:
...

I haven't flashed my PCM yet (I have read it though) but so far my KeySpan USB-Serial (actually a USB to mini-port replicator) is working fine.

I haven't tried it on this yet but I've had good...

For the P1514 error I assume this is sort of like a rationality check on the MAF meter.

IOW, if it is was showing very little airflow at 6k and 100% TPS it would throw that error. Or on the flip...

Ken,

"The AXIS you are referring to is the amount of engine torque in foot lbs.

This is a load value calculated by the VCM. "

Thanks. That was what I thought it had to be.

I'm guessing...

If it is a constant then why is it the x-axis for the following table (among others)?

http://ackthud.com/shawnfogg/pics/temp/torque.JPG

Would the switch be the tow mode? I assume it would be...

The torque I'm talking about isn't a map setting to change, it is an axis of the grid itself as part of the lookup table.

For example in the shift time it bases the shift time on the gear shift...

In some of the A4 transmissions settings there is a torque field on the maps ranging from 0 to 640. What is this number and how is it calculated? Would it be something like a calculated load?

Shawn