ECMlink GSX Stalls out when put into Gear

[Nate355RS]

1). Any boost, vac, or exhaust leaks?
No
2). Verified mechanical timing?
Yes
3). Verified base timing?
Yes
4). Ignition system
COP or Stock Coil: COP
Wire brand and Age:
Spark Plug brand, type and Gap: BPR6ES, .030

5). Motor health (Compression Test)
Cylinder 1: 160
Cylinder 2: 158
Cylinder 3: 158
Cylinder 4: 155

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

7). Compression ratio
9:1
8). Any known bad sensors or brittle wiring?
No
9). Any DTC/CEL codes?
NO
10). Electrical system
Car off (not running):
Car running:

11). Base fuel pressure and injector values
Base Fuel Pressure: 40
Injector Size (cc/min): 1050

12). Properly calibrated and configured wideband sensor
Sensor Brand: LC2
Calibration Date: Yesterday

13). Type of fuel
Type: 93 pump
Percent of Ethanol:

14). Watched ECMlink how-to videos?
Yes

I'm trying to tune my 1g auto GSX with 272 cams and SMIM with a S90 TB. I've done boost leak checks, verified timing, and verified my fuel and fuel pump are working properly. I've successfully tuned the idle on a few stockish DSMs, but none with cams or an S90 TB.

My main problem is when I give the car a little gas, or put it in gear, it goes very lean and usually dies. If the car doesn't die at tip in and I hold the gas it will rev free no problem. Would you mind taking a look at my log and seeing if anything sticks out? This is being tuned on SD

A couple things I've noticed aren't right but haven't been able to fix:

Idle is about 200rpm higher than commanded idle rpm. I don't see a BISS screw on the S90 so not sure how to fix this.

AirflowPerRev is between .3-.35, regardless of deadtime.

ISCPosition is 0 at idle

 

[Nate355RS]

I found a thread that had the InjBatteryAdj I needed for my injectors. That with a little higher idle keeps it idling when I put it in gear. Now I'm just dealing with the tip-in lean spike. Soon as I give it throttle it pegs lean, just like it does in the log I posted. It doesn't happen so much when the engine is cold, only at operating temp. It also happens during open and closed loop which I assume would rule out the 02 sensor or a problem with narrowband simulation.

 

[steve]

Idle is about 200rpm higher than commanded idle rpm. I don't see a BISS screw on the S90 so not sure how to fix this.

From the pictures I've seen of the S90 TB for a DSM there is a BISS on the bottom center under the intake flange.

Do you have the version that also has the ISC mount? If so close the BISS down to try and reach 30 steps on the ISC at idle.

 

[Nate355RS]

I did not know there was one under there. I'll give that a shot, I also might have a lead on an ISC and housing I can bolt to it. The idle is pretty decent now, but it will hunts for idle every once in awhile. I just need to get that lean spike on tipin fixed. Cruise and full throttle are fine and it revs clean to red line. It just seems to be a problem with transient throttle response off idle.

 

[Nate355RS]

I mounted the ISC and found the BISS. When I ground the timing connector to adjust the BISS, the car stalls. I'm at a loss on how to keep it running with the timing connector grounded.

 

[steve]

With DSMLink you can adjust the BISS by watching the log and seeing when your ISC steps are about 30 at your selected idle. If you can't get it down that low you will to continue looking for your air leaks.

 

[Nate355RS]

Just to update, I was tring to tune around a mechanical problem. The CAS was 180* out and as soon as I flipped it around and readjusted idle it runs great. I'm surprised I got it to run halfway decent with that big of a problem.