Need MAFTPRO help URGENT

[Fletch124]

Ok I had this problem before and now its back. I will start the car and the AFRS will be totally fine, then slowly they will start to creep rich (10AFR). Cruising the AFRs like to stick around 10-12AFR. To fix this problem before I just swapped TPSs and the problem was gone, even adjusted wrong the problem was fixed.

The other night it stated doing the same thing again so i pulled over, pulled the clips off the sensors and pulled the efi fuse. Put it all back together and the car ran awesome the rest of the night. The next day the problem was back. I went and bought a brand new TPS from autozone and installed it and it didnt fix anything. I retimed the car, I checked the grounds (all MAFTRO grounds are on the steering column), I reflashed the system to 4.89 from 4.8, I tried pulling ridiculous amounts of fuel on the low table in idle rpms and it didnt change a single thing. Still rich 11AFR idle.

I emailed my bin to Americanjebus and he played with the BIN and sent it back and the car without a problem after, hard to remember but I believe it was when i changed the TPS.. not totally sure.

This is getting really frustrating, autox tomorrow and im looking forward to it. Could it be possible a sensor is dieing? If so what other cars have the same sensors that I can get from a regular parts store? Why is it getting locked in open loop???

Version 4.89
Vehicle select – 0
# of cylinders – 6
Displacement – 3.0
Airfl mode – Speed density
Map source – Gm 3 Bar
Load Srce –Use MAP
Baro mode – Sealevel
F-out mode – Supra mkiii
V-out1 mode – Set max setting
V-out2 mode – Set max setting
AFR source – 5v aem gauge
F-in m ode – Supra mkiii
Aux 1 mode – Aux trig off
Flowerr mde – Sd/maf


Setup
Mainscale - -20.5
V-out1 Max – 2.500
V-out2 Max – 3.600
Aftermarket – 0.0
Lo Load Pt – 36.4
M:I Load Pt – 100.1
Hi load Pt – 143
F out Max – 0
Tm base – 0
Tm correct – 1.27
Af Trdelay – 0
Fe Smooth – 30
Use Ve Table #1
Spkbase – 15.0

AFR tracking - OFF
Min TPS – 0
Min RPM – 2400
Min load – 331.5
Lean Lim% - 10.0
Rich Lim% - 10.0
Gain – 5.2
2000R – 11.5
3000R – 11.5
4000R – 11.5
5000R – 11.5
6000R – 11.5
7000R – 11.5
8000R – 11.5
Aux % - 0


Air Temp
ALL SET TO 0%


Aux Trig
ALL SET TO 0%


Tune Response
TPS enrich - 0.50
TPS Decay – 0.70
TB Size – 7
TPS Mapmax – 104.0
MAP Enrich – 0.40
Bst Enrich – 0.10
MAP TPSmin – 0.400
MAP RPMmin – 2560
MAFlim TPS - 0.000
MAF Limit – 0.0
MAF /Krpm – 0.0
Lim MinRPM – 0
Lim Time – 0.0


Spark WOT
2000RPM – 15%
2500RPM – 15%
3000RPM – 15%
3500RPM – 15%
4000RPM – 15%
4500RPM – 15%
5000RPM – 15%
5500RPM – 15%
6000RPM – 15%
6500RPM – 15%
7000RPM – 15%
7500RPM – 15%
8000RPM – 15%

Spark Aux
2000RPM – 15%
2500RPM – 15%
3000RPM – 15%
3500RPM – 15%
4000RPM – 15%
4500RPM – 15%
5000RPM – 15%
5500RPM – 15%
6000RPM – 15%
6500RPM – 15%
7000RPM – 15%
7500RPM – 15%
8000RPM – 15%

 

[Doward]

What is the TCCS reading, on the VF? When I had my MAFT-Pro, I ran the VF signal wire to one of the spare 0-5v inputs on the MAFT-Pro. Tuned via the MAFT-Pro until I got a steady 2.50v VF signal.

THEN, I started my 'performance' tuning. According to my wideband, the stock TCCS has a lean condition when transitioning at part throttle from vacuum to boost, so I manually richened that up a bit. And of course, at WOT (open loop) the TCCS took a back seat to the MAFT-Pro.

 

[americanjebus]

Baro mode – Sealevel -> this should be set to read at key on.

Mainscale is pulling huge amount of fuel. Try to recalculate it,

To calculate mainscale: taken from fullthrottletech.
"If you are using an adjustable fuel pressure regulator (which you should at this point) follow this formula to see what fuel pressure to use and based on that, how much of the maincale you should reduce...

Firsts:
Divide the new fuel pressure by the old Fuel pressure and then get the square root of that.

Second:
Multiply that square root (results from the first step) by the injector size that you have, and that will give you the new injector flow for that size injector at the new fuel pressure.
Here is an example:
28psi/43.5psi = 0.64367
now get the squareroot of 0.64367 which is = 0.802290
now multiply that result by the injector size
0.802290 x 720cc = 577cc

So at your new fuel pressure of 28psi the 720cc injectors are flowing at 577cc.
This means that at that fuel pressure of 28psi the 577cc are flowing about 31% more than the stockers (440cc) which would allow you to bring the maincale somewhere in the area of -30%."

 

[Doward]

Just keep in mind - lower pressure on the fuel rail can be detrimental to spray pattern.

 

[Fletch124]

Baro mode – Sealevel -> this should be set to read at key on.

Mainscale is pulling huge amount of fuel. Try to recalculate it,

To calculate mainscale: taken from fullthrottletech.
"If you are using an adjustable fuel pressure regulator (which you should at this point) follow this formula to see what fuel pressure to use and based on that, how much of the maincale you should reduce...

Firsts:
Divide the new fuel pressure by the old Fuel pressure and then get the square root of that.

Second:
Multiply that square root (results from the first step) by the injector size that you have, and that will give you the new injector flow for that size injector at the new fuel pressure.
Here is an example:
28psi/43.5psi = 0.64367
now get the squareroot of 0.64367 which is = 0.802290
now multiply that result by the injector size
0.802290 x 720cc = 577cc

So at your new fuel pressure of 28psi the 720cc injectors are flowing at 577cc.
This means that at that fuel pressure of 28psi the 577cc are flowing about 31% more than the stockers (440cc) which would allow you to bring the maincale somewhere in the area of -30%."

Yea sorry the Baro Mode has been set to Key on.

I just did the formula with 40psi which what the fuel pressure was set at least night, i turned it down to 38psi. I used the formula and came up with -14%. Adding fuel would encourage my problem to be even more by making the car richer. But I will try it.



I dont know how to see VF signal. There is no single word in the manual "VF" closest thing is VE. There is no "TCCS" in the manual either.

 

[Fletch124]

Doubt it matters but I installed an FMIC with full hardpipes. The Iat sensor is mounted about 6" from the butterfly on a aluminum pipe. I had a 3/8npt aluminum bung welded in, i installed the sensor with Teflon tape.

Could a bad 02 sensor cause this problem? Last time I looked at my 02 sensor it had some white stuff on it. Same thing as spark plugs referring to "Too hot".

I just tried another vacuum source from the back of the intake manifold rather than the vacuum line for the bov. It stayed around 14.7-15.2AFR a little bit longer but still started getting really rich.

I read around and found that AUX1 is the VF signal. On start up they are at 0.00 then a few seconds later they go up to im assuming 1.70-2.20, the numbers flash so fast its hard to tell.

I tried adjusting my mainscale to -14 and it just stayed about the same as far as AFR goes but a little bit richer. I adjusted the mainscale out to -60 and the AFRs actually stayed around 14.7-15.2AFR and Vf(aux1) was alot steadier alot more in the 2.00-2.50 range.

 

[Fletch124]

Here is a log from driving home from work.

 

[americanjebus]

I tried adjusting my mainscale to -14 and it just stayed about the same as far as AFR goes but a little bit richer. I adjusted the mainscale out to -60 and the AFRs actually stayed around 14.7-15.2AFR and Vf(aux1) was alot steadier alot more in the 2.00-2.50 range.

Dont pull that much on your mainscale without knowing the consequences. Your pulling 60% of the fuel across the board here. That applies to the entire range from idle to wide open throttle so keep in mind your pulling that much fuel from your top end.

Btw what value are you using as stock fuel pressure in your calculations? Off of the top of my head i cant remember what it was.

 

[Fletch124]

Dont pull that much on your mainscale without knowing the consequences. Your pulling 60% of the fuel across the board here. That applies to the entire range from idle to wide open throttle so keep in mind your pulling that much fuel from your top end.

Btw what value are you using as stock fuel pressure in your calculations? Off of the top of my head i cant remember what it was.

I was just pulling fuel to see if I could get the car to lean out. I put the mainscale back to -20.

FOUND THE PROBLEM: There was a split in one of the heater wires for the 02 sensor.

 

[Doward]

I *highly* recommend you take a break, right now, and read up on this:

http://www.well.com/user/mosk/Vfsignal.htm

TCCS is Toyota Computer Control System (aka your stock ecu that the MAFT-Pro is hooked up to!)

I'm glad you found the problem, but I really think you should take a minute to learn more about what the stock ECU is doing, and how the MAFT-Pro adjusts things, before going much further with any of it