camaro1185

My car goes rich when my foot is off the gas (mostly stays at 118 blm, but sometimes pegs 108 for some reason) no matter what speed or g/s. Once I hit the gas, even slightly it goes to 130 and stays there as long as my foot is on the gas.

I have been chasing my tail trying to tune the fuel, at idle(between 8-12g/s where it idles) but the tune does NOT change at all. This makes me think it has something to do with a table other than the MAF #1 table. Is there something in the LV8 table, a decel table or something like that.

Basically im trying to get to the bottom of why it seems no matter what fueling changes I at idle (my fueling changes at PT work) it doesnt change the car pegging rich (118BLM)

Any ideas??

camaro1185

Anyone, Im at a loss here and need to tune out the rich..

RBob

iTrader: (1)

Is the ECM in closed loop during idle? Is the O2 swinging? Is it swinging about stoich? Are you using the PW tables or the actual PW calculation from airflow? Are the injector compensation values set up correctly?

RBob.

camaro1185

Yes it is in closed loop, but the funny thing is tunerpros dash shows the 118 BLM the second it starts even in open loop.

The O2 does swing, but from stoich to around 700+

"Are you using the PW tables or the actual PW calculation from airflow? Are the injector compensation values set up correctly?"
NONE of that stuff has been changed from stock settings. All I have been tuning is the MAF1 table. Should I use these other tables??

The weird thing is it is rich at ONLY BLM Cell 0 the second you touch the gas it goes to either 128 or 130. It doesnt seem to update, the car runs either at 118 (idle) or 128 when cruising. I never have any other BLM's than that. The int does adjust though.

Here is another weird thing. I had a dyno day a few weeks ago and the car showed lean at idle and REALLY rich at WOT (11.5afr)

Since the car is stock and Im using a stock 350 6E chip with only the vats and egr turned off.

RBob

iTrader: (1)

> The O2 does swing, but from stoich to around 700+

Then the INT & BLM will be dropping.

> The weird thing is it is rich at ONLY BLM Cell 0 the second you touch the gas it
> goes to either 128 or 130.

The cell in use is being changed.

> It doesnt seem to update, the car runs either at 118 (idle) or 128 when cruising.
> I never have any other BLM's than that. The int does adjust though.

IIRC, there is something about the CCP being active for the ECM to use the other cells. There is a lot about this here on TGO concerning the $8D code. May be able to find out why by reading up on it.

> NONE of that stuff has been changed from stock settings. All I have been
> tuning is the MAF1 table. Should I use these other tables??

Not changing anything from stock doesn't tell me anything. The $32 code has PW tables instead of calculating the PW from the airflow directly.

RBob.

camaro1185

Actually its the other way around, the 32 calculates it the 6E does not.

Any help on what to look at/change?

While playing with it yesterday, I advanced the timing in the idle rpm and LV8, and it actually shot the BLMs up to between 122-130.

I appreciate the help RBob, but not sure where else to go from here...Im very new to this.

RBob

iTrader: (1)

> Actually its the other way around, the 32 calculates it the 6E does not.

Not correct, in $32 there is an option flag for whether to use the PW tables or to calculate the PW directly from airflow. $32 can also use either a frequency MAF (low freq) or an analog MAF. Again option flag selectable.

$6E can only calculate the PW directly from the airflow, and can only handle an analog MAF.

> I advanced the timing in the idle rpm and LV8, and it actually
> shot the BLMs up to between 122-130.

Not unusual. The burn is different.

RBob.

camaro1185

I understand that, but i'm trying to wrap my head around why when I tried changing the fueling even a large amount to see if I could lean the idle out, it didn't work.

Why would the fuel not lean out when using the MAF tables. Is there another table other than MAF 1 that controls idle fueling? Can I have a bad ECM, can I have a bad PROM?