Hey there all. I'm having some trouble after deleting my 02 sensor...when it goes closed loop it oscillates from lean to rich...go figure!

I was running with a wideband 02 with a narrowband output, but the controller box got wet (toasty!). I'm happy with my tables and am looking for a way to prevent it from going closed loop. There is no 'temp before entering closed loop' that I can find on the 6299.

Available settings related to it are:


BLM Enable map qualifier: I set this for 18kpa to max, 104kpa. Hopefully this will prevent it from going closed loop by moving the enable to wot?

MAX engine speed to enable BLM: I set this from 3500rpm to 0 rpm.

Closed loop timer warm: left this alone. My rational was no matter what the setting it will time out eventually, thus just delaying the issue

Closed loop timer cold: As above.


Any opinions on what I've done. I'm going to test it tonight but experience is the best teacher.


Thanks,

Chay

 

That seems different? Does that not suggest to you that BLM is allowed only >3500 rpms? If so, zero rpm will allow BLM at all RPMs. That will not help you.

I suspect > 3500 BLM is disallowed as you wish OL only. >3500 maybe PE takes over fueling. leave that table as is? Or set to 6000 rpms?

How did that chage work out for you?

 

You want to disable closed loop, not BLM learn. Otherwise the INTegrator will still adjust the fueling.

Try this location:

$222

It may be in ADC counts which means that zero (0) is 151* C.

The location may also be $227

I didn't decipher the hac all that much.

RBob.

 

I think I found a crude work around.

I grounded the 02 sense lead. This prevented any cross counts and the ecm won`t enter closed loop it seems. It won`t change any BLMs.....they sit at 128. I didn't check the int....One would guess they would go full rich with the 02 grounded...I'll check and see if they move. I have to run it later today to check an oil leak fix anyway.

I`m using tunerproRT...how does one look at an individual address (If there is a way) ? In the resultant bin before programming:

$222 is $34 ( 52d)
$227 is $a5 (165d)


Do either of these values look right?

I've never hacked the bin before...is this a complicated process?

Thanks,

Chay

 

Ah yes, tools/advanced/hex editor...same values, which is good!

Ronny, re: max...I think this cuts off BLM learn above this value, so at 0 they'd never come on.

I don't have a 02 sensor at all right now...I may add one though. It might help the situation I'm in. I think just a narrowband (heated) this time though! That way i could go back to closed look and leave all this stuff stockish.

Any suggestions on a part#?


Thanks,


Chay

 

I returned the values I modified and installed a simple 02 sensor. It seems to work great.

I`m still curious about the open loop though. I may not be able to maintain an 02 sensor so close to the head...it`s mounted just ouside the head, cylinder 2 in the ex manifold, the only dry place to put it.


Chay