lakeffect2

I've been using the EBL VE learn function and comparing it to my Wideband display on the A pillar.

Even when I am seeing 13.2-13.8, the VE learn still wants to add more fuel making things pig rich. Hence the rich gettiting richer theory.S

I'm using BLM as my VE learn. The wise band was previously hooked up to the 7730 ECm when I was running the Prominator chip set, (which finally died) It was patched into the ECM on one of the connectors. The wide band is NOT currently setup on the EBL board via the Auxillary Sensor port.

So here's a few questions

Is the EBL seeing the wide band because of it's previous installation? or must it only go through the Auxillary sensor input post?

(Honestly, with the EBL thread being over sixty pages and growing it's tough to find answers that may already be there. Maybe it should be broken apart to become stickies for certain common areas of question.)


Dave

RBob

iTrader: (1)

The ECM follows the NB O2 feedback. If the sensor is reporting lean, the BLM will increase.

The two most common reasons for this is an exhaust leak or a sensor that is not up to temperature.

RBob.

Dominic Sorresso

RBob is of course right. I had this very situation occurring w my 84 Xfire.
I found a muffler that was loose and nearly falling off. At decel, it was sucking air and so the NB was reporting lean. Fixed it, and EBL began taking fuel back out.

Ronny

iTrader: (1)

Myself as well. I had a loose set of bolts at collector flange. Muffler shop did not put on lock washers!

morgsie

iTrader: (1)

I would hook up the WB to the EBL and do WB Learns. Much faster, and will learn in PE mode as well.

lakeffect2

So the key of that was in my opening post.

Even though the wideband is already "hooked up" the the ECM, is the EBL not seeing it because it's not hooked up to the analog data inputs on the EBL board?

Is that the only way it sees/uses the Wideband data stream?

Dave "I doan need no steenking data" Buchholz

xch3no2

Dave, I hope you don't expect over 14 unless you are at idle or cruise, that's not how it goes. The engine requirements determine fuel necessity, not theoretical numbers.

RBob

iTrader: (1)

Yes, needs to be connected to the ADC Channels terminal strip.

RBob.

lakeffect2

Gotta love your sign on name. As the joke goes, what kind of "acid" are you on?

My concern was that I was lifting off the throttle, expecting the car to go into DE or DFCO. And was seeing 12.3-13.8. Subsequent VE learns wanted to add more. That didn't make sense,as i was anticipating leanng out under DE or DFCO. Didn't see that happening

Gas mileage was at under 8 mpg, last check was over 10. Looking for non-right foot related causes.

Yes, at idle as well, (900 rpm 60 kpa) it wants to make it richer. Could be ECM still hasa choke hold on things.
I have not been in cruise yet. I turned it off to get fuel charts without it's intervention

Ronny

iTrader: (1)

I presume you are seeing the dash light lit when car is in DE and DFCO?

I took the 20 MAP columun way down in value. Seems I am still at the same A/F you are. 13.3-13.8. May be a lot more manifold wetting to flash off that we are not aware of.

lakeffect2

Thanks guys, I appreciate all your thoughts.
Ronny, I'll do a data run tomorrow morning to find out. I'm sure everyone can appreciate that I haven't wanted to be distracted looking at the display while enroute. So collecting the data and replaying will help to see if the DE/DFCO square lights up green or not.