E38 Stand alone problems

[minytrker]

Its a 6.2 in an old suburban with a th400. It runs great except at random it will only allow thorttle to go to 46% throttle but if you hold it to the floor if will slowly add throttle back in. The only way to fix this is the flash the pcm, then it work normal for a while, sometimes it wont do it for 10 starts sometimes it will do it after 2 or three.

[GMPX]

The first thing I would look at is table {B0533}. It is usually the cause for reduced throttle openings when going WOT.
Was your tune from a Auto or Manual 6.2L ?

Cheers,
Ross

[gmh308]

The first thing I would look at is table {B0533}. It is usually the cause for reduced throttle openings when going WOT.
Was your tune from a Auto or Manual 6.2L ?

Cheers,
Ross

Still trying to figure out this table. The x axis is gear, the y axis is torque in Nm.......is the cell data Nm as well?

If it is Nm in the cells, does that mean in 1st gear for example, and the expected torque is 345Nm, it will limit to 50Nm? Or reduce it 50Nm :shock:

Color me thick on this one :doh2: .

cheers!

[minytrker]

The first thing I would look at is table {B0533}. It is usually the cause for reduced throttle openings when going WOT.
Was your tune from a Auto or Manual 6.2L ?

Cheers,
Ross


It was from an auto. The weird thing is it only does some of the time but once it starts doing it, it wont go away until you reflash it.

I will check that table.

[minytrker]

Here is the tune. Its just a stock 6.2 with a th400. Currently there is no MAF. At radom the truck with not go 100% throttle and if you hold it to the floor it will slowly go to 100%.

[GMPX]

Lorenz, have you checked existing DTC's on this vehicle?
I would imagine if it is an Auto based calibration it will not be happy there is no TCM there. This might be the cause of your issues.

[minytrker]

Lorenz, have you checked existing DTC's on this vehicle?
I would imagine if it is an Auto based calibration it will not be happy there is no TCM there. This might be the cause of your issues.

It doesnt flag anything, even when it doesnt go to wot. Do you have a 6.2 manual tune? I'll try anything at this point.

[gmh308]

It doesnt flag anything, even when it doesnt go to wot. Do you have a 6.2 manual tune? I'll try anything at this point.

Is this an L92 6.2 with VVT installed, or an LS3?

In either case you would be best to find, and use, a stock manual calibration for a 2WD 6.2 or 6L. Your current cal appears to be an A6 AWD/4WD. (I dont have one otherwise I would post it for you.)

You could also try putting all your Torque Management parameters back to stock for a start.

What pedal are you using, and are you getting any logs of spark/knock retard/burst knock/ETC/Pedal etc?

:cheers:

[minytrker]

Its a L92 6.2 with VVT out of a 07 escalde. I bought the pedal from speartech when they did the harness so Im not sure. I can log everything, everything runs fine until at random it will not go WOT. Once it does this I have to flash it in order for it run normal again. It does this more once the truck is up to operating temp than cold.

[gmh308]

Its a L92 6.2 with VVT out of a 07 escalde. I bought the pedal from speartech when they did the harness so Im not sure. I can log everything, everything runs fine until at random it will not go WOT. Once it does this I have to flash it in order for it run normal again. It does this more once the truck is up to operating temp than cold.

Ok. Did Speartech supply the ECM & ECM calibration as well? What has John had to say re the challenges you are having?

Have you tried a stock A6 calibration? i.e. like the one you posted, but stock except for VATS/speedo/DTC revisions, and MAF zeroed out?

Have you tried completely unplugging or de-powering the ECM in lieu of a re-flash? If you are putting the same tune back in, then it is the same effect.

:cheers:

[minytrker]

Ok. Did Speartech supply the ECM & ECM calibration as well? What has John had to say re the challenges you are having?

Have you tried a stock A6 calibration? i.e. like the one you posted, but stock except for VATS/speedo/DTC revisions, and MAF zeroed out?

Have you tried completely unplugging or de-powering the ECM in lieu of a re-flash? If you are putting the same tune back in, then it is the same effect.

:cheers:

yes, I tried stock with no luck. I dont remeber 100% but Im pretty unhooking the batt for awhile will clear the problem also.
No the ecm is the one that came with the motor and I made the changes. I spoke to John when it wouldnt start and he said it worked when he had it and he pointed the finger at efi live pretty much.
I dont have the truck any more, its 1200 miles away. As soon as I get this problem figured out Im am getting the pcm sent to me so I can reflash it.

[GMPX]

I spoke to John when it wouldnt start and he said it worked when he had it and he pointed the finger at efi live pretty much.
I hate to think how many customers we pushed their way for harness's :ermm:

[gmh308]

I spoke to John when it wouldnt start and he said it worked when he had it and he pointed the finger at efi live pretty much.



That is a rather odd comment. For conversions like this, EFILive largely leaves its competition behind. Having fixed a few of the aforesaid sourced cals, which were not implemented with EFILive :).

The auto calibration expects a number of parameters from the trans. It is not getting these in your case. Various calibrations react to missing data in different ways, and at different times. Sometimes they fail immediately, other times once a day, and have seen them give trouble once every couple weeks.

The right combination of conditions, temp, pedal, airflow, rpm, speed, load and bingo: one of the limp modes will come up, and wont got away without de-powering the ECM. MAFLess does not help this.

Try and dig up a manual 2WD tune for your application. Do a general post on here, someone is sure to have one.

Also try and get a non VVT tune. Your tune is still going to be looking for VVT related items.

:cheers:

[gmh308]

I hate to think how many customers we pushed their way for harness's :ermm:

Ditto.....

[minytrker]

Also try and get a non VVT tune. Your tune is still going to be looking for VVT related items.

:cheers:


But it is a VVT motor, can a run a 6.2 tune for a vette with a manual. As far as I know I have never seen anything with a 6.2 VVT with a manual.

[gmh308]

But it is a VVT motor, can a run a 6.2 tune for a vette with a manual. As far as I know I have never seen anything with a 6.2 VVT with a manual.

Just a path that attempts to simplify possible issues. :) A Vette manual tune probably a good choice too, apart from the fact it may look for a clutch pedal sensor..... :shock:

[minytrker]

Just a path that attempts to simplify possible issues. :) A Vette manual tune probably a good choice too, apart from the fact it may look for a clutch pedal sensor..... :shock:

Well I have been paying another tuner to work on this for me, since the suburban is 1200 miles away. What he has come up with is what you said its because of the auto tune. He has been loggin it and when it goes into limp mode it flags transmission torque management. Now for the million dollor question?

Can you flash a 6.2 vette tune into a 6.2 VVT escalade ecm and run it? What will the VVT do? Is it safe to run like that? This is a 100% bone stock escalade motor. Can you just enable VVT in the vette tune?

[gmh308]

Well I have been paying another tuner to work on this for me, since the suburban is 1200 miles away. What he has come up with is what you said its because of the auto tune. He has been loggin it and when it goes into limp mode it flags transmission torque management. Now for the million dollor question?

Can you flash a 6.2 vette tune into a 6.2 VVT escalade ecm and run it? What will the VVT do? Is it safe to run like that? This is a 100% bone stock escalade motor. Can you just enable VVT in the vette tune?

If the E38 is compatible then it should flash though the VVT will probably just sleep. It must have a safe static position so the engine will run in event of a VVT failure (like broken actuator wire).

In EFILive the VVT is greyed out in C6 cal, so looks like it cant be changed.

Looking forward to the results :).

[minytrker]

Next question, can you do a FULL FLASH on the e38 from the escalade tune to the corvette tune?
The other tuner is using hpt on this, but I have a friend there with efi if needed to do a full flash. The other tuner didnt know if htp could do a full flash on the e38 to another OS.

[gmh308]

Next question, can you do a FULL FLASH on the e38 from the escalade tune to the corvette tune?
The other tuner is using hpt on this, but I have a friend there with efi if needed to do a full flash. The other tuner didnt know if htp could do a full flash on the e38 to another OS.

Shouldnt be a problem. What is the service part number of the ECM?