Hi. I have a 1995 1/2 ton truck 5.7 4l60e etc.
I thought i would try here also as there is probibly more people in the know here.
I have some information here:
:http://www.fullsizechevy.com/forums/...ning-blms.html
I am at a loss what to do as there is some messed up information on my 27c512 chip in my truck.
It doesent match any other bins i pull up on moats.
Any ideas?
Should i datalog the stock eprom with the chip and G1 type adapter removed?(stock eprom in the blue cover only).
Thanks.
Barry.
Here is the bin from the original read only chip in the truck.

 

OK there is something odd about EEPROM contents when compared against known good BIN file (in this case BJFD). First VE table came from your BIN file and second came from BJFD. For some reason all near idle cells in VE table are zeroed. Also, idle VE table is zeroed. hmmmm

//RF

 

I tried seting up a good xdf file and a stock OD bin file and burned a chip.
Wouldn't run this morning so i just put the stock eprom back in without the chip and adapter. ran ok. got me to work.
Right on the computer box is bjym and od. ????????????
I'm at a loss. possibly the chip is corrupt and the eprom has been trying to fix the mismatch of info?
Got me stumped?
I need to sleep and try again tommorrow.
I'll have a quick look in the morning to see if anyone has come up with an idea on where to go from here.
thanks.
Barry.

 

I think I found it - the mask ID Byte, in your 'original 95 chip' file ($4008) is set to $A9 (not $0D) which is rather odd. FWIW you may have non $0D PCM or EPROM reader / Burner not reading stock chip correctly.

//RF

 

I'm using the moats burn2 to read the chip.
and tunerprort to datalog and work with the bins.
will winald work on my truck?
Thanks.

 

WinALDL will not work with your PCM. WilALDL was designed for earlier C3 ECM operating at slow 160 baud ALDL (the website does not indicate that it supports 7427 PCM). The later P4 PCM provide data stream at much higher 8192 baud. TunerPro-RT, with correct ADS definition loaded, should be able to capture PCM real time data. What is strange, as I have stated in earlier post, the mask id byte in your bin file is set to $A9 not expected $0D. This leads me to a follow up question - which PCM do you actually have? All of this is assuming that Moates Burn2 is correctly reading stock EPROM. So the mystery deepens....

Can you take photos of your PCM, especially service tag, and if possible of the stock EPROM chip and post them. Lets stop guessing.

//RF

 

Thanks for your patience RF.
My camera card is shot right now.need to get a new one.
Now:
serv.no 16197427 bjym *86bjym64385896*
Numbers on original eprom( soldered in) "434316174895"
The chip on the right covered in clear "1264342"

The adapter i have that came with the truck is called MEMADPTW.
Could the read only chip be from an aftermarket company?

Just guessing. I'll try burning a different chip and see what happens.

Thanks.

 

OK.
I was able to read the stock eprom from the truck using 28 small mig wire pieces and put it into the burn2 unit.
It came back as a stock chip should. LOL.
I think the chip adapter i have is from some aftermarket company.
I just ordered a g1 adapter from moats.
(I thought the one that came with the truck would work ! )
I'll get back on here when the adapter gets here.
Thanks RF and others.
Barry.

 

I did some research on the web looking to identify the adapter and i think it is a superchip adapter and chip.
It is the exact adapter on there site.
I guess it must have to match the adapter to work.
I'll see what happens when my g1 arrives. LOL

 

Ok!!!!!!!!!!!!!
I have my new g1 adapter from moats and i burned a chip and it works fine.
Now could someone tell me how to put my .ADL file into .TXT in excel.
I've tried changing the file name to txt, opening it in excel and all i get is jiberish.
It felt like the truck was running lean poping out the carb.
looking at the dash on tunerprort, the blm's were quite high(lean).
I want to adjust the VE tables to put the truck in rich mode and work from there.

Thanks.

 

In Tunerpro-RT 4.x
under menu
tools->setup window (or simply hit F4)

In the right hand side locate EXPORT SELECTED SESSION to CSV

this will dump data capture file into CSV format which Excel can import directly.

//RF

 

lets see if this works.
I had to zip it to upload.

 

Hi People!
Well to make a long story short: DO A TUNEUP LOL!
I found out where the miss in my truck was.
The plugs, cap and wires likley haven't been changed in years!
I think the wires are the original parker numbered gm wires.
I thought i would check things out and when i pulled a few wires off of the cap, some were black and one was covered in rust!
Replaced all of the electrical stuff and now it purrs.
I'll do a good datalog and go from there.

 

It is always the simple (and stupid staff) that hurts the most! Let see that data log when you got it.

//RF

 

Ok RF.
I went out to day and did a datalog.
In the middle i did 2 exelerated runs in an open stretch of road and the knock counts went up in a hurry.
Here is my zipped log:

 

Probird

Observations
1) Reset ECM by disconnecting negative bat terminal for 30 seconds. You may have some old learn data before you did tune up.
2) Based on tune2 data-log your light throttle cruise is indicating rich conditions sample # 1870-1885: BLM =113; RPM=1800, MAP = 40 KPA; SA=21.45deg; VSS= 57.

3) Acceleration event sample #5557 - 5588
TPS increase from 1.37V to 2.48V; ECM is using block #9 to look-up VE, rich BLM= 119; MAP increases from 50.24 to 73.71 indicating engine load is increasing. At sample #5571 your TPS % is over PE threshold (48%) and ECM should be going into PE mode dumping even more fuel (note BLM=113, block 10 already rich), but I guess PE has been disabled (cross counts increasing and both BLM and INT indicate ECM is operating in CL)? At sample 5582 knock counts begin to creep right after ECM switched from block 10 to 11, while BLM steps from 113 to 123 - that's a big jump! While in Block 11 (sample 5581 to 5597) MAP is decreasing from 75 to 70 (SA is increasing from 11.25 to 15.47) O2 is showing rich 676 to 800mv. Rich mixture does not need too much timing to burn.

Fueling transition from block 10 to 11 rather abrupt. Block 10 appears to be rich to begin with. PE has been disabled???? Looks like Block Learn Cell #11 is when most knock occurs in the above mentioned acceleration event.

Suggestions
Based on this data log:
Before getting into AE and PE (and WOT) try to dial in BLM's closer to 128 by adjusting VE table. Use steady state cruise data and adjust VE table (it looks like you are rich everywhere (BLM<128))

//RF

 

Thanks RF.
In tunerpro, the "minimum tps for pe" is at 5.1% tps.
Should one increase that to say 70% to stay out of pe until i get the ve tables done?
I bought the SA book "high-performance fuel injection systems" to read.
Can't get enough information! LOL.
In the meantime i'll work on the ve idle and cruise tables.

Barry.

 

Barry

Constant "minimum TPS for PE" is at 5.1% tps is absolute limit. IOW below 5.1% of TPS PE will not occur. The table that actually governs entry into PE can be found in:
Tables/Functions -> 'TPS for PE vs. RPM'. In your original BIN file it has the following limits:
RPM %TPS
4000 35.2
3600 39.8
3200 39.8
2800 39.8
2400 46.1
2000 48.0
1600 55.1
1200 60.2
800 39.8
You can bring all of these values to about 75 % to keep out of the PE mode during VE tuning. Just be careful when approaching higher TPS values (half throttle) too lean is not good for motor.

Couple more observations:
1) your MAT sensor is reading -40C. This will have some effect on fuel mixture. Do you have provisions for MAT (flag is unchecked so it must not be there dahhh answered my own question.)

2) During VE data collection disable Charcoal Canister Purge (uncheck flag). CCP will add gas fumes in addition to fuel from injectors.

It is an interesting book - I only briefly thumbed through it over the weekend at my local B&N.

This is a very old post, but worth a look. While not directly applicable to $0D mask concepts are very similar:
https://www.thirdgen.org/forums/diy-...ttle-fuel.html



//RF

 

OK!
Had some time to do another datalog.
On the last run i (you) noticed that the ve table was all mostly rich
with most of the blm's at around 114-116.
I multiplied the whole idle table by .9
From the looks of the new run, I'll only need to add some fuel to the ide and a few other spots.
So far so good i think.
Opinions?
Thanks

 

Looks a lot better.

Observations - BLM Block lern #4 almost always lean. Need to find out which cells of VE table are assigned to Block #4 (600 RPM and 23-26 kPA) and are lean (133)
Block 16 around idle area RPM 525 and MAP 28-30 KPA is also lean (134)

Basically BLM 128 +/-3 is OK

//RF

 

Sorry to change the subject, but I'm working on getting a 7427 to upgrade from the 8746. I need to tell a guy where it's at in his 1995 so he can pull it for me.

Where exactly is the ECM and what does it take to get it out? I'm guessing I'll need the connctors and pigtail with it as well?

Thank you