24lb injector change and idle problems(eec tuner)

Daveman01 · 07-10-2002

I switched to 24lb injectors and entered the injector slopes and my idle is really crappy. When my car is hot and I turn it off, it tends to stall when restarting(takes a while to crank up). On cold starts, in the morning, it cranks right up,hesitates(idle drops), then idles good. I'll put it in first to take off, and it seems to buck and want to die. After the initial buck, it runs fine. I have a 94 gt convertible with all the mods except the heads(full exhaust,all the intake stuff,msd stuff,155lph,regulator and guage,pulleys....). Any help would be appreciated.

Vortex · 07-10-2002

did you get a recalibrated Mass Air sensor for the 24lb injectors? If its not reading the proper amount of air it throws things off.

GTRaptor · 07-10-2002

Adam: no need for a calibrated maf when using a EECTuner or any other chip.

Daveman: send me or attach the EEC file to the thread, i can check it for you.

Vortex · 07-10-2002

ah.. didnt know. trying to help.

GTRaptor · 07-10-2002

No problem

The EEC controls the size of the injectors and the meter, plus anything you can think of !!!

The EEC is basically a bunch of tables and scales you can TWEAK depending on your parts or ENGINE.

The hardware is basically the same for most Ford cars, what changes the most is the programming.

I could install a 351 and tell the EEC i now have a 351, or install longtubes and tell the EEC to use a larger pulse delay value so the O2 sensors act right, or install heads cam and intake and tell the EEC my Volumetric efficiency has increased, etc.
It is completely programable with the EECtuner and most chips.

GTRaptor · 07-11-2002

Please delete all the stuff that remains STOCK !!!
Just leave what you have changed

Not easy to go through all of it

Daveman01 · 07-13-2002

Sorry for all the stuff. U4P0

CHECKSUM_BASE_ADDRESS 8192 # Set to 0 to clear Error code 15
WOT_VOLTAGE 3.0518 # WOT TPS breakpoint (V)
GLOBAL_SPARK_ADDER 0 # Global spark adder (Deg BTDC)
MIN_TIP_IN_SPARK 0 # Minimum actual spark during tip-in (Deg BTDC)
MAX_SPARK_RETARD 0 # Max degrees of spark retard

MAF_FUNCTION # Mass Air Transfer Function
( 15.9998, 835.509 ) ( 4.76807, 835.509 ) ( 4.44312, 695.465 )
( 4.177, 595.977 ) ( 3.88599, 499.658 ) ( 3.54395, 399.219 )
( 3.35498, 347.574 ) ( 3.14893, 295.612 ) ( 2.90991, 243.334 )
( 2.69409, 201.828 ) ( 2.58203, 182.5 ) ( 2.44995, 161.272 )
( 2.31592, 142.261 ) ( 2.15405, 120.083 ) ( 1.98901, 100.122 )
( 1.88989, 90.2996 ) ( 1.80298, 82.3786 ) ( 1.69092, 72.8734 )
( 1.57397, 62.4176 ) ( 1.46802, 54.1798 ) ( 1.32104, 43.6745 )
( 1.18188, 35.7535 ) ( 1.09106, 30.6346 ) ( 0.884033, 21.7631 )
( 0.75, 13.6936 ) ( 0.571045, 8.6242 ) ( 0, 8.6242 )
( 0, 8.6242 ) ( 0, 8.6242 ) ( 0, 8.6242 )

WOT_FUEL_MULTIPLIER_VS_RPM # WOT Fuel Multiplier
( 16383.8, 0.945312 ) ( 6000, 0.945312 ) ( 4400, 0.953125 )
( 3800, 0.976562 ) ( 3200, 0.945312 ) ( 2400, 0.96875 )
( 1600, 0.90625 ) ( 0, 1 )

INJECTOR_BREAKPOINT 1.00136e-05 # Injector Breakpoint lb/injection
LOW_INJECTOR_SLOPE 24.8395 # Low Injector slope lbs/hr
HIGH_INJECTOR_SLOPE 24.8395 # High Injector slope lbs/hr
MIN_INJECTOR_PULSEWIDTH 1.39999 # Minimum injector pulsewidth (ms)
ECT1_HS_FAN_ON 224 # ECT1 to turn on HS cooling Fan
ECT2_HS_FAN_ON 228 # ECT2 to turn on HS cooling Fan
ECT_HS_FAN_OFF 220 # ECT to turn off HS cooling Fan
ECT_LS_FAN_OFF 204 # ECT to turn off LS cooling Fan
ECT_LS_FAN_ON 208 # ECT to turn on LS cooling Fan
OPEN_LOOP_IDLE_MULTIPLIER 1 # Open loop idle multiplier

DRIVE_IDLE 700 # Drive Idle RPM
NEUTRAL_IDLE 904 # Neutral Idle RPM
MAX_RPM_CLOSED_THROTTLE_IDLE 950 # Maximum RPM for closed throttle idle

MIN_ECT_FOR_FUEL_SHUTOFF 140 # Min ECT for decel fuel shutoff (Deg F)
MIN_ACT_FOR_ADAPTIVE_CONTROL -20 # Min ACT for Adaptive Control (Deg F)
MAX_ACT_FOR_ADAPTIVE_CONTROL 160 # Max ACT for Adaptive Control (Deg F)
INTAKE_VOLUME 6 # Intake Manifold Volume
EGR_MULTIPLIER 1 # EGR multiplier
EGR_TYPE 0 # EGR type (0=sonic, 1-PFE, 2=none)
THERMACTOR_PRESENT 1 # Thermactor present (0-no, 1-yes)

END

GTRaptor · 07-13-2002

Why you changed the MAF transfer function?

I though you had a stock MAF.

If not, what brand, size and MAF calibration you got?

One more thing:
MIN_TIP_IN_SPARK 0 # Minimum actual spark during tip-in (Deg BTDC)
Change to
MIN_TIP_IN_SPARK 21 # Minimum actual spark during tip-in (Deg BTDC)

In case of tip-in your spark will go to ZERO advance

Daveman01 · 07-14-2002

I have a pro-m 75 cal'd for 19's.

GTRaptor · 07-14-2002

ah ! thats the problem !

Well bud, heres my advice, install the STOCK MAF electronics in the PROM housing, then you need to change the MAF TRANSFER TABLE to reflect only and increase in flow but STOCK voltage.

Heres what you do:

MAF_FUNCTION # Mass Air Transfer Function
( 15.9998, 835.509 ) ( 4.76807, 835.509 ) ( 4.44312, 695.465 )

The first value in EACH PAIR is voltage: leave it alone
The second value in each pair is flow.

Get the STOCK table values.

Then multiply the SECOND value (FLOW) in each pair by 1.15

This is an "aproximate" approach, it wont be 100% correct but close.

Let me get back to you later for a correct MAF table.

BTW, your slope values are correct.

86Cobra · 07-21-2002

Your best bet is to use the calibration sheet that came with your Pro-M to generate a new transfer function and enter that function. IMO, you should keep your Pro-M electronics in place.

I was having problems getting this approach to work with my X3Z (93 Cobra) EEC. I just recently switched to an A9L, entered the transfer function for my Pro-M (cal'd for 30s and an X3Z) and changed my injector slopes to 36 (low) and 30 (high). Wow, what a difference!

I'm amazed at how much better it idles and runs at part throttle now, even with my fairly large cam (235/237, .567/.574).