411 computer semi-opened loop

[LS1_Dragster]

I just replaced the computer in my 97 Yukon with a 411, I updated the OS to 02020003.

I've tried everything to get it to work semi-open loop:

1) B3647 set for 14.63 at idle and cruising
2) B4205 all set to 255
3) B3801 set to disable
4) B3601 all set to 14.63

I did this with my 71 firebird, different computer and OS 01270003 and it works great.

What am I doing wrong?

Lee

[LS1_Dragster]

Anyone? Even if your just guessing I would appreciate some help!!

Lee

[LS1_Dragster]

Somebody at EFILive tech support should have an answere to this problem....They wrote the program so there has to be a brainiac there, someone go wake him/her up!!!!

Lee

[mr.prick]

What is the problem?
Fuel trims are off (0%) and you are commanding 14.63 AFR in OL.
Is this not "semi-open loop"? :unsure:
If everything is "working" with another tune you have, create a script from it and use it against this tune to see if there is something you missed.

IMO
The real question should be why are you logging LTFT, STFT and O2 voltage when you don't want them to control fueling and why so many PIDs?
The channels count is sky high.

[LS1_Dragster]

Fuel trims are 0 because the computer isnt going into semi-open loop and modifying the fuel.

I have no idea how to use scripts. And it's a different OS.

I logged LTFT to see if they are being used, as in going into closed loop. It was just another place I was looking for answers.

I'm logging STFT and O2's because that's were you see the computer trying to maintain a 14.63 AFR, hence semi-open loop. Have you used semi-open loop?

See below the other cars log and tun file. You can see at frame 1283 the computer goes into closed loop mode and the O2's start dancing like they're supposed to.

[joecar]

Is your VE table correct (BEN equals 1.00)...?

[LS1_Dragster]

They are getting closer but I'm not finished yet.

Here's a more current log of driving, I'm working out the shifting issues before I tackle the AutoVE. Right now it shifts really hard on the 1-2 and soft on the 2-3. It has a shift kit and I'm just about ready to remove it and go completely back to stock! I had a supercharger and an Ed Wright tune on it and it always shifted too early with his tune. I can tell you this though, it has NEVER ran this strong before, the throttle is so crisp now. I kinda wish I left the supercharger on and did this tuning, but the dragsters getting the supercharger!

[mr.prick]

Semi-OL = Use O2 With Open Loop? (STFT)
I'm not hip to the semi-OL thing,
I assumed with commanded AFR table @ 14.63 that is SOL. :hihi:
Does this OS have {B4206}?

STFTs are still 0%, does that = no SOL?

[LS1_Dragster]

Correct, it will use the O2's to maintain 14.63AFR, nice for idle and cruising.

Yes it has B4206 and all values are all 255 per the manual.

Correct, 0's mean no SOL. If you look at the firebird log you will see it in action at frame 1283.

[LS1_Dragster]

Could there be a problem with 0202003? 01270003 works great.

EFILive techs with 0202003, can you setup a car in semi-open loop just to see if it works on yours?

Lee

[dfe1]

Could there be a problem with 0202003? 01270003 works great.

EFILive techs with 0202003, can you setup a car in semi-open loop just to see if it works on yours?

Lee
For what it's worth, I'm using 0202005 and semi-open loop works fine. Are your values in A0008 "1" at normal coolant temps?

[LS1_Dragster]

Yes, I can also see it commanding 14.63 yet nothing happens.

Maybe I'll upgrade to 0202005 and see what happens....

[LS1_Dragster]

I was wondering about this:

This 97 5.7L only has 3 O2's, it has a Y-pipe and 1 cat. The PIDs are GM.HO2S11 Bank 1 sensor 1, GM.HO2S12 Bank 1 sensor 2 (both in the Y-pipe) then GM.HO2S22 which is behind the CAT. Maybe the computer seeing S11 and S12 on the same bank designation and then S22 instead of S21 is making the computer not do it's job?

I wonder if I rewire the computer so that GM.HO2S11 and GM.HO2S21 are associated with the correct inputs to the computer and turn off GM.HO2S22 in the DTC processing. I bet the computer cant compute because there is no right and left sensor 1.

Lee

[GMPX]

We can't set up a car with that OS to test sorry, but given these OS's have been out for about 5 years now I think if there was a problem with them then we would have heard about it by now.

One thing I've noticed from your logs, Bank1 O21 is not active at all, it's stuck at 0.45V, you need to log Bank2 O21 to see if that is doing the same thing. If the O2's are not swinging the PCM will assume they are not ready.

Cheers,
Ross

[joecar]

Just like dfe1, I too have run SOL from 02020005 without any problems.