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ECMlink Dialing in Idle

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Chumpaumpalumpa

Proven Member
1,554
303
Jun 16, 2014
La Habra, California
1). Any boost, vac, or exhaust leaks?
Boost leak tested 5psi above your max boost with no leaks?

Yes


2). Verified mechanical timing?

Yes


3). Verified base timing?

Yes


4). Ignition system
COP or Stock Coil: Stock
Wire brand and Age:
Spark Plug brand, type and Gap: BPR7ES .028

5). Motor health (Compression Test)
Cylinder 1:
Cylinder 2:
Cylinder 3:
Cylinder 4:

6). Performed basic throttle body adjustments?
Idle Switch: Broken, Simulating with TPS
Throttle Cable:
TPS:
BISS:

7). Compression ratio

8.3


8). Any known bad sensors or brittle wiring?

Nope


9). Any DTC/CEL codes?

Nope


10). Electrical system
Car off (not running):
Car running:

11). Base fuel pressure and injector values
Base Fuel Pressure: 37psi
Injector Size (cc/min): 1250 (FIC)

12). Properly calibrated and configured wideband sensor
Sensor Brand:
Calibration Date:

13). Type of fuel
Type: California 91oct
Percent of Ethanol:

14). Watched ECMlink how-to videos?

Hey guys, trying to dial in my idle with V2, 1g car w/ 2g maf, fic 1250s, BC272's. For some reason, AFRest is stuck in the 8.x-9.x's at idle and I don't know where to go from here because the (new) stock o2 feedback isn't really a nice up/down like some other logs I looked at. Everything just seems so delayed. My wideband is additional to the stock o2, further down the downpipe. It's just really confusing because my fuel trims and Airflowperrev seem to check out just fine, but some of the other numbers are just weird. Thanks in advance.
 

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You don't mention how the car is running. Is it idling smooth? Is it stumbling, stalling? AFRest is based on the airflow the car is getting and how much fuel it is injecting. So the ECU thinks you are injecting too much fuel based on the airflow you have. With cams you are probably going to need to raise the MAF slider at idle which will increase your airflowperrev, but this should be ok. Alternately don't adjust the MAF slider, and try tweaking the deadtime and global fuel so that you lean it out a bit. If the car is stumbling then you probably don't want to lean it out this way.

Here's my other questions.
How did you come up with the deadtime for the injectors? They seem high to me.
How did you calibrate the AEM Wideband? The table provided in the instructions is not accurate. Did you check that in open loop so that the logged value in ECMLink matches with the gauge or at least close to it?
Do you have a MAP sensor you can connect to to the ECU for logging?
 
You don't mention how the car is running. Is it idling smooth? Is it stumbling, stalling? AFRest is based on the airflow the car is getting and how much fuel it is injecting. So the ECU thinks you are injecting too much fuel based on the airflow you have. With cams you are probably going to need to raise the MAF slider at idle which will increase your airflowperrev, but this should be ok. Alternately don't adjust the MAF slider, and try tweaking the deadtime and global fuel so that you lean it out a bit. If the car is stumbling then you probably don't want to lean it out this way.

Here's my other questions.
How did you come up with the deadtime for the injectors? They seem high to me.
How did you calibrate the AEM Wideband? The table provided in the instructions is not accurate. Did you check that in open loop so that the logged value in ECMLink matches with the gauge or at least close to it?
Do you have a MAP sensor you can connect to to the ECU for logging?
Idles fine. Doesn't have balance shafts so it's not particularly smooth, but not terribly choppy even with the cams. Doesn't stumble or stall. If I say come up to a light in neutral, it will idle around 1200 RPM then Drop to 900 until completely stopped, then down to target idle.

The deadtime seems high to me as well, coupled with the fact that the O2 sensor will not cycle properly at idle makes me think something is up. That deadtime came from adjusting the Idle slider to get .24-.26 grams/rev and then adjusting the deadtime to get AFRs between 14.6-15.3. Sometimes these values change and It will start idling at .29 grams/rev at 16.3+ AFR or something weird then drop back down. Gets pretty choppy around those higher AFRs. For the most part it idles where I set it at.

For the WB I'm having trouble at lower AFRs, specifically lower than 11.6. I logged the raw volts to ecmlink and back probed the gauge output to verify it was reading right, then I wrapped a gas soaked rag around the sensor and recorded the Lambda and raw volts reading and did the same in open air. For whatever reason, it wont sweep to ground completely. I think the op amp in it went bad but I fiddled with it so what you are seeing in the log is accurate to .1 AFR.

No MAP that I know of. Just a 2G MAF.

I fixed the AFREst issue its more of why the inconsistent idle and why won't the O2 cycle now.
 
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