Lean during open loop warm up?

[SMOKINV8]

A buddy of mine has a 90 Mustang LX with a 331ci engine (built by a local builder), Victor Jr. intake converted to EFI, NOVI 2000 blower, a PMS series 2, and a MAF that was modified by Performance Mass Air Flow Systems out of Michigan.

Update: Here's a list of mods he e-mailed me.
Year model: 90 LX
Engine cubic inch: 331
Power Adder/NA: Paxton Novi 2000
Amount of boost/nitrous: 15#
Intake: edelbrock Victor jr carb converted efi
Throttle Body: Accufab 90mm
Mass Air Meter: PRO-M 77mm
Intake Piping:AFM Power Pipe
Cylinder Head & rockers:TFs Twisted wedge Fox-lake porting 1.6RR
Camshaft profile: AFM B451
Injector Size: 72#
FMU type: none
Header size/type: Bassani Longtube 1 3/4 -1 7/8
Fuel Pump(s): Aeromotive A1000
Rails: Aeromotive
Supply/Return Line size: 8an supply 6an return
Fuel type: 93octane
Notes:9.25:1 compression, 3.73 gears,C-4 transmission, Bought PMS new in 2002. Also have low impedence driver. I had my mass air recalibrated for the 72# .

His initial tune was set up by a well known Ford tuner, but there was too much timing and fuel in it for the car to run right at lower RPM's. My buddy pulled some timing and I believe some fuel, and after dabbling with it for a while he's got things so that everything seems to be great in closed loop.

His problem is that in open loop while the car is warming up, it runs extremely lean. He told me its up around 18:1 or 19:1 while the car is warming up, according to the LM1.

Suggestions I came up with:
*Possible exhaust leak near an O2 caused the rich initial tune.
*His tuning was done while in closed loop, so O2's compensated for correct fueling. Tuning in open loop should eliminate this possibility.

Any other idea's? I haven't messed with Ford stuff too much at this point, so I'm only quasi-helpful for him at this point. I know we've got some Ford guru's that post on here, who I'm hoping can lend a hand.

[Russ K]

Turn on the wideband to get it up to temp for about 2 min. before starting the car. Air pump still on/working?

Russ Kemp

[SMOKINV8]

No AIR pump on the car, but good suggestion.

Here's some of the settings in the PMS if anybody feels some of these might impact things:

Stand Alone
Enable: on
F Trig TPS: 35%
F Trig RPM: 6000
T Trig TPS: 35%
T Trig RPM: 2000

TPS
Idle Set: 1.1 v
WOT Set: 4.2 v
Error: 30%

Idle Adjustment
Fuel: +20
Timing: +8
Idle Control
Start Fuel:-32

Rev Limiter
Stage 1 RPM:6700

Boost Timing--4----8----12----16----20

2000 ....-4.....-7......-10......-13......-16
2500....-4.....-7......-10......-13......-16
3000....-4.....-7......-10......-13......-16
3500....-4.....-7......-10......-13......-16
4000....-4.....-7......-10......-13......-16
4500....-4.....-7......-10......-13......-16
5000....-4.....-7......-10......-13......-16
5500....-4.....-7......-10......-13......-16
6000....-4.....-7......-10......-13......-16
6500....-4.....-7......-10......-13......-16
7000....-4.....-7......-10......-13......-16
7500....-4.....-7......-10......-13......-16
8000....-4.....-7......-10......-13......-16

Boost Fuel--4----8----12----16----20

2000 0
2500 0
3000 0
3500 0
4000 0
4500 0
5000 0
5500 0
6000 0
6500 0
7000 0
7500 0
8000 0

WOT Fuel

2000: +12
2500: +8
3000: +6
3500: +2
4000: -2
4500: -6
5000: -4
5500: -6
6000: -4
6500: -4
7000: -2
7500: 0
8000: +2

WOT Timing

2000: +8
2500: +8
3000: +8
3500: +8
4000: +8
4500: +7
5000: +7
5500: +7
6000: +8
6500: +8
7000: +7
7500: +7
8000: +7

Prt F LL----2----3----4----ML----5----6----7----HL

2000: +26..+26..+26..+26..+26...+18....+12...+6....0
2500: +18..+18..+18..+18..+18...+12...+8......+4....0
3000: +12..+12..+12..+12..+12...+8.....+6....+2.....0
3500: +6..+6...+6....+6.....+6...+4.....+2.....0......0
4000:0
4500:0
5000:0
5500:0
6000:0
6500:0
7000:0
7500:0
8000:0

Prt T LL----2----3----4----ML----5----6----7----HL

2000:
2500:
3000:
3500:
4000:
4500:
5000:
5500:
6000:
6500:
7000:
7500:
8000: