Maft pro running problems

cre · 09-04-2012, 05:21 AM

I don't have TunerPro installed on any of my computers right now, but you may post a datalog and your bin file and I'll install TunerPro to look them over when I can make the time (probably next weekend)... Might be able to just make the adjustments for you depending on how obvious the issue is.

You can set the MAFT Pro us any number of different ways. My preference these days is to let the ECU control closed loop operations and use the MAFT Pro to control open loop. You can use the MAFT Pro's ETPS function to force the ECU into open loop at any point if the factory triggers for open loop aren't giving you enough flexibility.

When tuning make sure ALL of the AFR/WOT tracking functions are disabled.

Here's a link to my site and some of the stuff I've published about setting up the MAFT Pro along with a "guide" about what each setting is and how it operates (there's one for 4.8 and a newer one for 5.x). CLICK ME

Have you got previous tuning experience? If not, you've chosen a poor system to start with. It's amazingly flexible but the learning curve and lack of shops which support it generally result in a lot of people calling it quits. You may want to try to find someone in your area who would be willing to help you with it in person.

1989toyotasupraandpickup · 09-12-2012, 02:17 AM

Hey Cre sorry for not getting back to you. i have been out of town for a few days so i did not mess with the car. i am new to the maft pro and i know it is a challenge and i would like to know more about it. I got the car running now its just tuning and getting it to run right. the AFR is at 14.7 when idle cant get it there while cruising its like 16 or 17. but anyways i reconnected the stock oxygen sensor still have the problem of hitting the accelerator real quick and the car will want to stall out. my afr goes to 10 when this happens. its really odd because if im at a red light or stop sign and i hit the accelerator quick it wont pickup right away. i have to fether it because im afraid its going to stall. Have to figure out tuner pro and how to get the data log to you. I tried messing with the tps and map erichments to no avail.

cre · 09-12-2012, 04:32 PM

Yeah, I'm really going to need your bin and a thorough log from TunerPro to offer any significant help... Otherwise I'm going to end up doing a full online course on the system and I haven't the time for that. Did you read though all of the stuff I've got on my site regarding the MAFT Pro's settings and the defaults for the MKIII and wiring? I haven't updated in some time but it's pretty comprehensive.

1989toyotasupraandpickup · 09-15-2012, 01:19 AM

Sorry cre really cant get a bin or datalog right now. the computer that hooks to the maft pro quick working at the moment. i have been messing with a few things and got it to idle at 14.7 afr and it stays there. It drives awesome just the only problem im having still is there. i blipp the throttle real quick and the rpm goes down to like 400 rpm then back to 700 rpm and it acts like it wants to stall. i can even make it stall sometimes by blipping it real fast. its really driving me nuts. i know im no help without the bin file and the datalog.

09-04-2012, 05:21 AM	#1
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I don't have TunerPro installed on any of my computers right now, but you may post a datalog and your bin file and I'll install TunerPro to look them over when I can make the time (probably next weekend)... Might be able to just make the adjustments for you depending on how obvious the issue is. You can set the MAFT Pro us any number of different ways. My preference these days is to let the ECU control closed loop operations and use the MAFT Pro to control open loop. You can use the MAFT Pro's ETPS function to force the ECU into open loop at any point if the factory triggers for open loop aren't giving you enough flexibility. When tuning make sure ALL of the AFR/WOT tracking functions are disabled. Here's a link to my site and some of the stuff I've published about setting up the MAFT Pro along with a "guide" about what each setting is and how it operates (there's one for 4.8 and a newer one for 5.x). CLICK ME Have you got previous tuning experience? If not, you've chosen a poor system to start with. It's amazingly flexible but the learning curve and lack of shops which support it generally result in a lot of people calling it quits. You may want to try to find someone in your area who would be willing to help you with it in person. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

09-12-2012, 04:32 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Yeah, I'm really going to need your bin and a thorough log from TunerPro to offer any significant help... Otherwise I'm going to end up doing a full online course on the system and I haven't the time for that. Did you read though all of the stuff I've got on my site regarding the MAFT Pro's settings and the defaults for the MKIII and wiring? I haven't updated in some time but it's pretty comprehensive. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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09-12-2012, 02:17 AM	#2
1989toyotasupraandpickup Stock Join Date: Jun 2012 Location: ny Posts: 26	Hey Cre sorry for not getting back to you. i have been out of town for a few days so i did not mess with the car. i am new to the maft pro and i know it is a challenge and i would like to know more about it. I got the car running now its just tuning and getting it to run right. the AFR is at 14.7 when idle cant get it there while cruising its like 16 or 17. but anyways i reconnected the stock oxygen sensor still have the problem of hitting the accelerator real quick and the car will want to stall out. my afr goes to 10 when this happens. its really odd because if im at a red light or stop sign and i hit the accelerator quick it wont pickup right away. i have to fether it because im afraid its going to stall. Have to figure out tuner pro and how to get the data log to you. I tried messing with the tps and map erichments to no avail.

09-15-2012, 01:19 AM	#4
1989toyotasupraandpickup Stock Join Date: Jun 2012 Location: ny Posts: 26	Sorry cre really cant get a bin or datalog right now. the computer that hooks to the maft pro quick working at the moment. i have been messing with a few things and got it to idle at 14.7 afr and it stays there. It drives awesome just the only problem im having still is there. i blipp the throttle real quick and the rpm goes down to like 400 rpm then back to 700 rpm and it acts like it wants to stall. i can even make it stall sometimes by blipping it real fast. its really driving me nuts. i know im no help without the bin file and the datalog.