Maft pro running problems
 

Hello everone. i recently installed the maft translator pro and got the car running. the manual states to connect the white wire to the igt and it would not run kept getting a code for igf. i connected the white wire in the IG- on the check connector and the car started right up. the car will idle at 14.9 on the afr gauge right where i want it and the car does run good. the only problem i am having is when i hit the gas real quick it does not respond good. sometimes it will even stall out. it has a hesitation when the throttle is pressed quick. Another question is do you have to unplug the stock oxygen sensor from the connector. this will put the car in open loop to allow tuning with the maft pro. I heard someone tell me something about tip in on the maft pro. Any help would be appreciated.

i forgot to mention that i am running full speed density

What wiring diagrams and setup instructions are you using? Post a link if you have one. If you're following the "Quick Setup Guide" which came with the unit it may be significantly out of date.

TPS and MAP enrichment are two setting you may want to take a look at. Feel free to experiment with them and follow your data logs to see if you're spiking rich or lean. Throttle body size also plays a factor in the tip-in calculations. If you're running a stock TB then you'll want 6 or 7. Has the stock O2 sensor been removed or are you letting the ECU and the MAFT Pro battle it out?

i downloaded the quick setup guide for the maft pro 4.40. I also downloaded the recent manual 5x or something like that. the car does run good but when i press the accelerator quick and let go the car will stall out. new at this kind of thing so im sorry if i ask stupid questions. Tried adjusting the tps enrichment and the map enrichment with not change. same thing. the oxygen sensor is still in place just unplugged. its a new oxygen sensor. but dont i have to force it into open loop for the maft pro to take over the fueling. i have the analog out on the wideband hooked up to the maft pro. the stock tb is at 6 or 7 i cant remember which one. i think it goes rich when i blip the gas

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.

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.

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.

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.

were their any problems that you had before installing the maft pro? any cel's before installation?

I did not have this problem before I installed the maft pro. There were also no trouble codes before. Now I have code 24 the air temp sensor. Um when the problem happens sometimes I get code 34 boost pressure abnormal. I only get it sometimes tho when I blip the throttle. There are no boost leaks as I could see or hear. No vac leaks either

Code 24 and 31 are to be expected unless you power the MAFT Pro BEFORE the ECU. I've covered this on my website and provide a wiring diagram how to power the MAFT Pro before the ECU. Take some time to go through what I have up on my site *thoroughly*.... A lot of your issues may be explained.

As for the code 34... It's not reliable as you're tampering with the airflow signal. Code 34 is based on airflow and RPM. With the MAFT Pro improperly tuned or setup the airflow signal could easily be well out of the "acceptable" range.

Yup, still need a bin and log...

I hope you've disabled PTT (Part Throttle Tracking) and AFR Tracking as I previously instructed.

How exactly do you disable ptt and wot tracking. I set the idle tps to 0 and the cruise tps to zero under the ptt menu. then i went to the wot menu and put the mintps value to 0. Plugged the oxygen sensor took the efi fuse out for 30 seconds then put it back in. Drove the car for a few minutes and ran great but all of a sudden the car started to bog down and misfire real bad. could not go over 20 mph. the afr gauge said very lean when all this happened. it was choking by not having enough fuel.

http://www.fadingworld.com/CRE/Autom...nual%205.x.php

You didn't read it all. With WOT tracking min TPS sets the minimum the TPS signal must be at for WOT AFR tracking to be active. In this menu you want to set it higher than is realistic. Set it for 5v+. Alternatively you may set either min RPM or min Load higher than possible (ie: setting min RPM for 8000), OR you may set Gain to 0. It's a bit confusing that PT and WOT tracking are the opposite.... I really figured Bob would have done something about that by now.

Now, if you haven't made any significant changes to the car's fuel system you should be able to zero out the fuel maps and the car should fairly normally. Now is the time to adjust the trim and tip in/out (decay) settings. Then once it feels good, disconnect the O2 sensor and see what needs tweaked. Then plug the O2 sensor back in, setup the ETPS system and tune for upper-mid and WOT and let the ECU deal with the lower loads.

Thank you cre for that link. it really helped me out and everyday i am learning something new about the system. im not perfect at it but at least im trying and i have people on here that will help me you in particular!!!!! Thank you so much and im sorry for all the questions you may think are dumb questions. I will tweak with the settings. still trying to learn about the vf signal and how to enable it on the maft pro and how to view it on the sensor screen. if you could give any advise that would be great. Thanks again cre!!!!!!

I've never found Vf to be all that useful for tuning. It's a decent diagnostic aid but unless you're trying to maintain a stock tune it's not really helpful. Setting it up is easy enough, you wire the Vf pin to one of the MAFT Pro aux inputs, set the Aux In parapeter in the MAFT Pro's CFG Settings menu to 0 and then in the SensorMonitor you set one of the four monitors to Ax1 to see the readout (0v to 5v). You'll need to define the input in TunerPro if you want it to show up in TunerPro's logs.

CRE. It will not let me load up the file for you. i was going to attach the log file but it says invalid. can i send the file to you?

You should be able to attach it by either zipping it up in a zip archive or possibly by adding .txt or .zip to the file name after the real extension.

ok i think i got it. take a look and make sure that i have the right files. they seem to work good. the log has 2 sessions. the first one is the driving no boost and the other is the one under boost. Thanks.

Here is the bin file forgot to add that to the zip file i gave you. sorry

I've been away due to a death in the family. I don't have TunerPro or the supporting software installed on any of my computers but as soon as I get a chance I'll go through what you've posted and see if anything calls out to me.

Sorry for the delay, things haven't been wonderful recently and it's hard to focus on some things. In the bin and log you sent me you have part throttle and WOT AFR tracking enabled. I said before that you should disable ALL AFR tracking functions then disconnect the stock O2 sensor and then tune. Your idle AFR looks good because that's the only AFR tracker that you have setup well by the way. Your trigger for the WOT tracker is too high and in the boosting log you posted you never meet the criteria so it never activates... Same thing for the part throttle tracker and the gain is WAY too low so even once the criteria are met the operating conditions have changed before the MAFT Pro has had enough time to affect any real change in fuel correction.

I can't recall if I've mentioned it in this thread yet or not but the ECU has two different open loop fuel maps. Which map is used depends on a couple factors during startup. If the coolant is measures as "warm" within 30 seconds after startup the ECU runs a map which is approximately 10% richer during any open loop operation. This can cause a lot of irritation if you're tuning and don't know about it. My recommendation around it for applications where the AFR will eventually be controlled by either the stock ECU or a piggyback is to simply make sure the engine has cooled between tuning sessions and to not tune or rely on data logs made if the engine has been started while already warm.... This also means that if you stall at an intersection while out on a tuning run... well, it's time to stop and head home. :( This isn't an issue with the MAFT Pro, it's the stock ECU and it's not limited to the 7M's ECU.

Any updates?