Ive been messing around with datalogging and I have a spare ecu that ive been using so i can leave the original alone incase i need it. so i copied the original bin and wrote it to the spare ecu. problem is the spare ecu makes the engine run different (worse) then the original ecu. since 1 ecu is from a 350 and the other is from a 305 does it matter if the 350 bin is runing in the 305 ecu. in other words the original bin should stay with the original ecu. if thats the case then ill order another g2 socket and mod the original ecu.
just want to add that these are 7747 ecu's im using

 

Check: key on engine off and look for quick blink then solid on. That tells you the .bin is good. The calpack in each ecu may be different. Not sure if that makes a diff.

 

ok a quick blink of what? Im gonna log on the way home some maybe I could send ya my log file and maybe you could offer some insight for me?

 

CE-SES light on dash.

 

It dont flash at all

 

If solid on it may be ECU. If rapid blink bad .bin. I assume the bulb is not missing or defective.

 

no it works because it came on yesturday while using the spare ecu on the way home. getting code 32 egr problem. I finished hooking up egr the other day and it ran really bad...so i pluged the vacume line and it ran much better again. i assume the egr leaned out the mix to far cause im already running lean at idle. so i figured just plug it off for now. btw is there a way to stop the ecu from looking for egr stuff in the bin. It dont need to function just has to be there for inspection

 

yes set the EGR coolant temp high or maybe the EGR MPH. I forget

In the constants. OBTW if you cannot find in TP rthere is a search function. search EGR and all related show up.

 

also btw im running 55lbs injectors as you asked befor on bpc thing. 350cid and 17psi fuel pressure. i see the egr in the scalers list.
theres
minimun coolant temp
egr enable at or below tps
egr disable at or below tps
egr enable at or above this map
egr disable at or under this map
minimun egr duty cycle to allow egr on
max tps to allow egr on

 

i assume just set the minimum coolent temp which is 122 and make it like 400 instead. this way it wont ever turn on.

 

Thats the one to turn it off.
your BPC is 132.

 

could the bpc be called something else in my bin. i still cant find that

 

747-$42 mask. $42 right?

BPW? Look at every item in constants. May be called something else?

 

the BPW constant for egr off is set to 135...ill change it to 132. so what is that base pulse width?

 

i see tunepro gives an info file on all scalars describing thier function... didnt notice that befor

 

btw i also have to leave the distibutor set at about 10degress advanced. if i set it to 0 in bypass mode the truck has no power at all.. very slugish and boggy. what should i be looking at to fix that?

 

BPW is same as BPC. Set the initial SA in .bin same as the physical distributor. Adjust you timing in the tables. If engine likes more timiing do so in tables. Moving the dist physical is done if you do not have ability to tune. Doing with distributor adds timing global incl WOT. Maybe you only need during mild/moderate accelleration...

 

thanks for info...the changes i already made has noticable improvement at idle and the engine seems smoother. I will check out the sa and im sure more ?'s will pop up...

 

so the ses light came on again about half way home. code 32 again. the egr is not functioning but ecu still having a problem. what else can we change to stop it giving a code?

 

That is what I did. Search code 32. May be something else other than EGR that looks smells EGR. In data log what is happening just before the 32 appears?

 

this is whats happening...when i use the original ecu and chip i get no code 32. if i use the extra ecm with a burned copy of original chip i get code 32. if i use the original chip with the extra ecm i get code 32. this is weird. there must be a difference between ecu's...they are both 7747 ecu's but the original is from a 350 and the other is from a 305. after about 15min of driving the ses light comes on. if i shut it off and restart the engine the ses light will be off for another 15mins...it does not change the way it runs when the light is on... i will have do another datalog and check it out however interpeting the data is new to me so not sure what to be watching for. if i could get a copy of a tuned engine and watch that to maybe see what it should look like. perhaps there is just something wrong with 1 of the ecu's

 

There is a good possibility that the quad driver for the EGR in the 'extra' '7747 is bad. Pull the top cover off the ECM and check the chips along the harness connectors. There are two quad drivers that are 16 pins each. Opposite side from the heat sink.

Look for burnt, browning of the PCB, craters in the chip, any physical damage. They are all signs of a quad driver that has met it's demise. If the PCB isn't burnt they can easily be replaced.

RBob.

 

i took a look inside and i dont see any burnt spots or indication of faulty circuts. I have no problem with changing chips but is it really a problem as far as tuning.

 

the 2 on the left the ones your talking about? they say delco 8739 274 z 60904

 

looked around and i cant find those chips for sale anywhere...do you know where to getem?

 

Those are the two chips. Can tell as the center 4 pins go to the larger copper trace as a heat sink. The number to use is DS3668, national-semiconductor. The numbers on the chip as a/c delco or Delphi in-house numbers.

They don't look bad either. Check connector pin A4 for corrosion. Other then that would need a test bench and scope (or DVM) to troubleshoot where the issue is. It could be the control chip but that is rare.

The EGR is on q-driver U15, pin 1 goes to the ECM connector. Pin 16 is the input to the q-driver from the control chip.

RBob.

 

ok i stopped by the local junkyard and picked up another ecu that matches the original. plugged it in and drove home. after about 15 min ses light came on. just like the other 1... So i guess now i should try and make the original ecu turn on ses light by unplugging the egr. If it dont ever turn on the light then id say its the original that is faulty. what you think?

 

it seems i infact now have 2 lame ecus...well advanced auto has them on sale right now so ill get 1 tommorrow.

 

Im confused...I unpluged the egr and drove it for a while and the light did not come on with the original ecu...so why cant i make code 32 happen?

 

im closing the door on this problem...I bought a new ecu today and 10mins up the road guess what happened....the ses light came on again...all egr parts are new and i cant figure it out...i now have 4 ecu and still the original is the only 1 that doesnt give the code...so ill just move the g2 socket to that 1 and then continue with tuning...what a bitch...iv pissed enough money away now so whatever...there is a small bright side to all this, the ecu from the junkyard had a hypertec chip in it...whats the chances of that...it wont help me any but im sure i can sell it to somebody!