Throttle % and accel fuel problem

[beerfarm]

Great to hear! Keep us posted!

[mld54]

I have mine running better, still a little hesitation on very light tip in. I ran a 10 gauge ground from battery negative to pins 20, 40 , 49 and 60 at the ECU. I removed the circuits on those pins from the ECU connector. Then grounded those pins at the ECU to the new 10 gauge ground, the circuits I removed were just folded back and taped off. Now the noise problem is minimal, From what Blacksaleen said about the orange wire causing noise, Im guessing that moving the orange o2 sensor wire block ground on pin 49 is what helped. It is still grounded, just not to the block. I think I'll try removing it all together and see if it makes any difference. Now the car is responding to adjustments like it should and I'm not getting the false activation. The ground on pin 20 is also the ground for the shielding around the circuits on pins 16, 36 and 56 that go to the TFI module. They are ign ground, pip and spout, that circuit grounds behind the right kick panel below where the pcm mounts. I cleaned that connection down to bare metal to insure a good connection for the shielding.

Has anyone worked with the load based accel fuel any ? I'm wondering if it may work better to take care of my hesitation on very light tip in. There is so little throttle movement then that I don't know if I will be able to get  throttle based accel to work. I'm talking about very very light throttle movement like creeping forward in traffic. I don't have any problem with hesitation taking off, like when the light turns green.

[Blacksaleen95]

Have you taken any internal logs to see what the afr is actually doing during these light throttle transitions along with what accel fuel is doing?  I'd be willing to bet the car is not transitioning out of dfco, or it just needs more sensitivity for accel fuel. Most mustangs I've tuned the factory accel tables weren't that far off...  Usually you can just play with the tps% table and sensitivity and get it good.

Don't even ground that orange wire, that goes to analog ground and should not be reused now. If you are running a chassis ground into your sensor ground it will for sure cause signal issues, and it sounds like that is what you're doing. Also the only wires that shoould go to chassis ground are 20,40 and 60. That 49 is an analog ground and should not get chassis ground.

[mld54]

Blacksaleen, no logs at this time, I'll remove the orange ground on pin 49. Had to do some searching on analog ground, I didn't realize there were analog and digital grounds. By sensor ground are you talking about signal return ? if so thats pin 46, i didn't ground it.

Could dfco be affecting it from idle ? like creeping forward a car length in stop and go traffic ? thats where I'm having a problem. I'm going to have to make some logs, maybe this weekend if it's not raining

[Blacksaleen95]

Dfco won't be an issue at idle unless the settings are out to lunch...

Have you tuned the iac motor yet? You should be targeting -7 to -9% feedback at idle, not having this setup correct will def give you issues with off idle throttle. You can also play with the rpm offset vs tps table.

Post up your cal or email it to me and we can take a look and see if there's any glaring issues..

There's not really "digital" and "analog" ground, analog ground is for sensors, aka 5v -, the 20,40 and 60 are for the chassis, if you mix the two it causes issues. 

It sounds more like you need to work on your idle settings as it sounds like the idle feedback is fighting you while creeping in traffic.

[mld54]

You may be on to something with the idle feedback, my car is a auto and feedback is +2% in drive and -2% in neutral. I can't remember the rpm vs tps settings off the top of my head. I know I have it set to bring in rpm as the throttle increases. My laptop is in the car, so it may be the weekend before I can get a copy of my cal. I appreciate the help

[Blacksaleen95]

that is abs. the problem, having a positive fb% means the iac is trying to increase the idle, which is much harder to do than reducing airflow and bringing the idle down.  Target -8% in drive and it should be much better.

[mld54]

Well I removed the orange ground on pin 49 and adjusted the idle feedback % to -7 or -8. It's a different car, runs great, night and day difference. Thanks for the help Blacksaleen

[Blacksaleen95]

no prob, glad it's fixed... now go enjoy it!