Need SAFC help on KA fast!

[mmtmatrix]

Hello Everyone, could really use some help on getting my SAFC set right (I need to lean the car out to go pass emissions and today is the last day for a free retest).

I have the Sensor type set at 5 for in and out and sens. cal. set at 1 for in and out, I have cyln. set at 4 and the arrow for thro is going to the lower right. Is that all I need to set up? I started the car and it idels rough and smells a bit more rich than usual... I searched but couldnt find anything..

Any help would be great (BTW the car is a 90 hatch with a 91 KA DE running on a DE MAF and a 92 auto ECU)
Thanks,
Malcolm

PS anyone have a guess on how much fuel to pull to get the car to pass

mine mine limit
HC ppm @ idle 287 @ 2500rpm 314 LIMIT 220
CO% @ idle 2.67 @ 2500rpm 2.16 LIMIT 1.20

[mmtmatrix]

Also, just to add, I am pretty sure that everything is wired correctly, but also my tach does not work now after installing the SAFC...


Any ideas?


Thanks,
Malcolm

[pr240sx]

Maybe is a little late for you know but try checking:

wiring as you tach is not working, you need to splice into the tach signal wire, not cut it
The arrow need to be poiting up (/) 4 cylinder.
Have you checked the sensor testing screen?
Try using 5 in 5 out, 0 correction IF you have stock injectors.
Try not to lean the mixture too much, you can and will fry your engine if its too lean.
If you dont have a wideband O2 sensor to check, I would not reduce pass -5 on lower rpms, low throttle and no more than -3 on higher rpms, high throttle.

[giant killer]

mmtmatrix says "thanks for the help.. what does 0 correction mean?" ... the car is dumping fuel to the extent of a black plume from the exhaust tip... he hasn't change the arrow up/down yet.. will this make a drastic change?

words by benny b

[mmtmatrix]

Ok, well let me clarify a bit.

Ok, so with the SAFC hooked up as I think properly the car runs Really really rich, it dumps fuel/black smoke, and when you push on the throttle it barely reves. I believe I have everything wired correctly for two reasons, one is I am very anal, the other is the wiring harness that I am using already had been taped for a SAFC2, so I cross checked the SAFC 1 and 2 and double checked the guy before me work, and everything is the same, except the the SAFC2 has an extra wire (purple) that is for the knock sensor, so I am not using where he tapped into the harness.
The other difference is that the SAFC2 uses the 'engine ground' for a ground, vs. the SAFC1 uses the 'Air Flow ground' for ground. The wiring harness already had the wires partially prepped to use the engine ground, so I used it (what the SAFC2 uses), a ground is a ground right? Is it ok that I used an engine ground on the ECU as opposed to a Air Flow ground on the ECU? Or could that be my problem?

Also, I didnt 'cut' the RPM wire, I spliced into it like you should. The SAFC is robbing the Tach signal, I know this because I pulled power to the SAFC and re connected the Air Flow wire so I could drive the car and the Tach came back on.

I have the SAFC set at Hot Wire in 5 out 5, with the Sensor Cal set at: in 1 out 1. I have the cylinder set at 4, and no matter how I change the arrow, so its either 'up right' or 'down right' or '**' it still wont run properly. Thanks for that advide but no help there, ir ran best how I had it, down and right...

Any other Ideas? What is 0 correction? I do have stock injectors... Any other settings? Could it be that ground thats messing it up? It is grouned to a ground, but the ground the the SAFC2 uses, not the SAFC1? What is the sensor testing screen? Is the the Sensor check screen? What do I look for?


Please help if anyone can, all info. is very appreciated!!!

Malcolm

[theicecreamdan]

with ECUs a ground is not a ground, you're looking at very slight differences in ground potential in different spots, its possible they are the same, but also very possible that they are different. Ground to the correct spot for your model SAFC

[mmtmatrix]

Ok, Ill try the SAFC grounding point that I should be using as opposed to the SAFC2 Ground that I am using and see if that helps, if it doesnt, any other ideas???

Thanks for all the help,
Malcolm

[Tenchuu]

best way to do it, if you hooked it up like in the wireing diagram, you have spade connectors on the MAf plug, unhook the SAFC from the AFL wire so it does not modify the MAF signal whatsoever. congradulations, you are back to stock. I just did this the other day to my KADE because i was getting 18MPG instead of 23 city and 24MPG highway instead of the 28-30 I had before. but i doo miss the kick that it gave the engine. that and being able to "hop" the rear wheels on just about every corner.

[mmtmatrix]

yeh, thats what I had to to just to drive the car, the AFC is definately not working correctly, the car wont drive with it in let alone get 18mpg. Ill try re grounding, any other ideas?
That still doesnt help me, I put the AFC in the car to get it to pass Emissions (and to tune for performance later) that still doesnt allow me to pass emissions now....

Thanks,
Malcolm

[pr240sx]

reset the unit.
then troubleshoot from there
the arrow tells teh safc how tps voltage is calculated, opening the throttle will increase or decrease the voltage.
Correction means how much fuel you will be adding or removing at certain RPM and throttle position.
With everything stock, your settings should be 0 all the way.
Also, after resseting, check your sensor type. Must be hotwire

[mmtmatrix]

Ok, well I grounded the SAFC to the proper ground (not the SAFC2 Ground) and what do you know, it works!! Same settings I had before too.

Now the problem...

So I pulled 14% fuel at 1000 rpm's and 12% at 2k and 3k to try to lean the car out, HC PPM dropped a bit at idel and a bit more 2500, but CO% went up a ton at idel like over 1% and stayed about the same at 2500.
Anyone have any ideas on how to adjust/pull fuel to get the car to pass emissions???


Thanks for all the help.
Malcolm

[omgosh]

Disconnect vacuum hoses, and run the car at high rpms on the highway before hand to heat up the car. If that doesnt work you can get a bottle of something with alot of alcohol and mix that with your fuel...

[theicecreamdan]

I was right ?

yayyyy

[Tenchuu]

doesn't the ground differiential help the SAFC to work? i thought i read that somewhere.

[mmtmatrix]

Another dumb questions:

So I was actually driving the car today and I was playing with the SAFC and the monitor mode and I was looking at the throttle and at idel it said 100% and as I drove it went down towards 0, so I assumed that this meant that I had the signal reversed, so I changed the arrow so it points up, now at idel it reads 0% and as I give it throttle it gooes up. This is how it should be right? Why the heck did the car run with it reversed? It ran well, but could having this signal reversed mess up my emissions?

Thanks for all the help guys,
Malcolm

[pr240sx]

That tell the SAFC where is your throttle!!
Will run depending on your correction settings.

Go and retry the exam

[Tenchuu]

not to be mean, but you said that you read the manual right? and are veary carefull about stuff? i just have a general electronics experience, briefly looked over the manual and got it right.
Here is the mysterious engine output that Apexi has since made veary hard to locate on thier website
http://i2.photobucket.com/albums/y19/Tenchuuk/N3-B.jpg

if oyu still need help i will go out and get EVERY seiing off of mine to double check with you, just get ahold of me if you still want to check it. mine is a 98 auto... but not for mutch longer.

[mmtmatrix]

no Im not having any problems, and no i havent read the manuel yet, just looked at the install directions..

What confused me is that I got the throttle signal wrong, but the car still ran, i drove it around with it reversed.. I am going to re e test the car, probably pulling the same 14% and 12% fuel respectively and see what happens.

thanks,
malcolm