Need tunerpro XDF and ADX for 1228747 AKWA

[gregs78cam]

It's just not in the data stream... don't know if a guy good enough at hacking bins could make it work, wouldn't be worth the time really, just play with timing and watch for knock counts and back off.

I was just re-reading this thread, and noticed this. If there is a (well commented) hac for this mask, replacing something trivial in the datastream with spark advance should be pretty easy. I have changed half a dozen datastream outputs to items I want instead of what the factory thought I should have.

I did find a hac, and it looks like the Spark Advance value is located at L006A. If you were to create another .adx value with the same packet offset as say, Eprom ID only labeled "Spark Advance"...

Then create a new Constant in the .xdf with a location of L053D, Write comments to say something like "change this value from 00 02 (Eprom ID) to 00 6A to datalog Spark Advance".

That should do it. If this sounds too difficult I could probably do it tomorrow when I have my laptop with me.

[EagleMark]

I don't know of a hac for $4F? It's almost identiacal to $42 adx except for one byte name change.

But since you asked I started this thread as to not hijack what we are working on here...
http://www.gearhead-efi.com/Fuel-Inj...to-Data-Stream

EDIT: Ha! Your were editing when I was posting. You found a $4F hac?

[1leg]

Ok, i'm lost after checking both sensors out looks like they are working properly, I will start tracing the wires back to the ecu to see if i have a short some where. The only other thing i can think of is the ecu could be bad. I'm still not convinced that the engine is running this hot.

[gregs78cam]

Like I said, if the CTS checks out good at both ends of the temp range I would go by that, it has a much higher resolution when comparing temp to resistance. If you wanted to really check it out, find a thermocouple.

[EagleMark]

Ok, I'm lost after checking both sensors out looks like they are working properly, I will start tracing the wires back to the ecu to see if i have a short some where. The only other thing i can think of is the ecu could be bad. I'm still not convinced that the engine is running this hot.

I really don't know the answer, but do have a question? Is your temp gauge the stock dashboard? Terribly unreliable. Or is it a mechanical thermocouple type gauge? Way more accurate.

Also your temp, in data log anyway if I remember went to 230ish before it opened and then settled down to 212ish. That is a sticky thermostat! Changing out a T stat is cheap and easy... I just had a bad experience with a cheap thermostat in my LT1, was new when I flushed cooling system and would stick not quite closed and motor never really warmed up, heater was blowing cool air, though my heater core got clogged again. Then when I filled up and checked fuel mileage I knew I had an issue and did a data log that showed I never hit warm up.

Anyway I pulled T stat and went to NAPA, had one from AutoZone because they were open... just holding the 2 I noticed the one from NAPA was twice the weight. Looking at it carefully I noticed everything, every piece was much better made. Installed it and car warmed up fast and stayed there with good heat! So I tested the cheap T stat in boiling water and inferred gun. Took forever to open which was exactly opposite of my heat problem? Way off from degrees stamped on bottom. Pulled it out of boiling water and watched it close. That's when I noticed it was not closed all the way! Cheap piece of poop cost me 5 MPG that tank and I was cold for 2 weeks!!!

Moral of story is get a quality thermostat!

[1leg]

Tstat is a quality piece, but it's new and could be bad.

This is all a non issue now, CEL is blinking again. I'm starting to think the ecu is just bad. something is wrong. I'm going to try the hard reset again. Maybe i should convert to the 7747 will i'm at it, this truck has a KS so it shouldn't be to difficult right?

[EagleMark]

I think it's a plug in swap? If you need to repin go all the way to 16197427... Blinking? Not on steady? Again? You may have a bad ecm...

Least you realize new parts don't mean properly working parts...

[1leg]

I think it's a plug in swap? If you need to repin go all the way to 16197427... Blinking? Not on steady? Again? You may have a bad ecm...

Blinking really fast. Are you sure a 7747 is i plug in swap?
I don't really want to get into repining this truck

Least you realize new parts don't mean properly working parts...

Been working are cars for to long to not know that.... oh the stories.

I want to thank you guys again, i hope i'm not coming off as not listening about this temp problem.

[gregs78cam]

If you need to repin go all the way to 16197427...

I was wondering how long it would take before this was suggested. +1^, you won't regret it.

[EagleMark]

Blinking really fast. Are you sure a 7747 is i plug in swap?
I don't really want to get into repining this truck


Been working are cars for to long to not know that.... oh the stories.

I want to thank you guys again, i hope i'm not coming off as not listening about this temp problem.

Nope, I think your working on it, but if the ECM keeps going bad/blinking they may be connected?

No I am not positive but if you pull ECM and take picture of plugs and socket on ECM we can tell. I'll look to see if I have wiring diagrams of 1228747...

I was wondering how long it would take before this was suggested. +1^, you won't regret it.

I think we did on first page?

But he's got a project and just needs to get this running right.

Tap the ECM and turn key on? Still binking? Leave it blinking and tap ECM... tap tap tap... any change? Tap harder? Seriously this is a GM service manual test!

[1leg]

some pics let me know if you need something else.

I got a PIN out diagram for the 7747, i could go out and verify the wire colors and pin outs are the same.

[jim_in_dorris]

The factory wire colors aren't necessarily accurate. You really need the 8747 diagram to go with the 7747 diagram, then you can be sure. When my son gets home tonight, I will have him get on alldata and get the pinout. Unless somebody has a mitchell's manual available.

[EagleMark]

some pics let me know if you need something else.

I got a PIN out diagram for the 7747, i could go out and verify the wire colors and pin outs are the same.

Sure looks the same! There's loads or wiring diagrams and pinouts for the 1227747 in the ECM information thread. That would tell you how close you are, but like what jim_in_dorris said below? I think you may find them identical, same year, same truck just 1/2 ton to 3/4 ton got your 8747 ecm. What's wrong with just a replacement 8747?

The factory wire colors aren't necessarily accurate. You really need the 8747 diagram to go with the 7747 diagram, then you can be sure. When my son gets home tonight, I will have him get on alldata and get the pinout. Unless somebody has a mitchell's manual available.

That would be a great help if you can get wiring diagrams and pin outs. Our 8747 ECM Information thread needs them...

[1leg]

What's wrong with just a replacement 8747?

It looks like the 7747 has more support, I would love to dive deep into the 8747, but not enough time and long learning curve don't mix.. If i need to buy a new ecu and the 7747 is a easy swap then i will go with it, if not then a new 8747 will go in.

I would be great full if your son could get me a diagram. I was going to join the alldata, but it seemed expensive for just a wire diagram.

[1leg]

I went out and took some notes on my pin out and the wire color, I know color can very, but if i could find a good wiring diagram it might help.