S-AFC Install...few Problems

[BigAirSkier1580]

Installed a S-AFC today. Haven't done any tuning yet, still waiting on getting datalogging stuff...

Now I've got this problem.

CEL is on. No way to scan what code it is throwing, but I never had a CEL before. What's the likely problem?

Car seems to be running exactly the same as it was before. Also found out my Throttle is only opening up to 90% max.

 

[1993eclipseGS]

Did you tap a wrong wire that would cause the cel to come on?

The only way your car should run different is if you adjust the settings, Did you think throwing an safc on and thats it was going to make you faster? I most likly just took that the wrong way but who knows.

 

[BigAirSkier1580]

Did you tap a wrong wire that would cause the cel to come on?

The only way your car should run different is if you adjust the settings, Did you think throwing an safc on and thats it was going to make you faster? I most likly just took that the wrong way but who knows.

No, I didn't think the car would run differently with just the S-AFC. I'm not that retarded.

I was merely stating that the car isn't behaving any differentely. I am waiting for datalogging before I start adjusting anything. I just got a really good deal on the S-AFC and couldn't pass it up at the time.

As for wiring, I followed the wiring diagrams posted around on this forum, and the VFAQ guide perfectly. Everything is soldered, and electrical taped up cleanly.

That's why I'm thrown off as to why I'm getting a CEL, as no setting have been changed, and everything is wired correctly, and the car is running exactly as it was before.

 

[captd108]

just out of curiosity are you sure you have your afc set correctly, by that i mean do you have the arrow pointing up, 4 cyl, and under karman (hz).

 

[BigAirSkier1580]

S-AFC is setup correctly as well...

Also my Karman readout is always 3Hz. Is that supposed to be that way?

 

[karbon]

Sounds like you don't have the "airflow" portion of the AFC set up correctly. At idle the car should be reading around 30 or 40 something hz, and naturally change while driving since it's a measure of the air coming into the engine. It would seem that that's where your CEL is coming from.
Triple check your wiring, because that's what seems to be the problem.

 

[GSX20]

Also, if the SAFC was previously owned, make sure your rpm points are all zeroed out. If they're not and are too high or low the ecu will throw a fuel trim code.

 

[captd108]

yeah it def seems like there is something up with one of your connections. Your afc should only read 3 hz when the car is in the on position without the engine actually being on. With the car on it should read b/w 30-40hz like mentioned earlier.

 

[BigAirSkier1580]

All setting have been zero'd out, but they weren't initially, so maybe I need to reset the ECU.

As for the wiring, I'll have to go over things again. I thought I had all the wiring in correctly, but I must've missed something.

 

[captd108]

the thing is even with the afc settings all overt the place and messed up that would not affect the karman readings that much. Make sure the grounds are in correct and they are spaced apart correctly, and also that you have the right colors in for the airflow

 

[trbotaln]

You can scan your car for codes for free at autozone if you do not have access to a logger. See what code comes up, then it might help you figure out which wires are not hooked up properly.

 

[BigAirSkier1580]

You can scan your car for codes for free at autozone if you do not have access to a logger. See what code comes up, then it might help you figure out which wires are not hooked up properly.

Autozone has stopped scanning codes for free, due to liability or some b.s. such as that. So that kind of rules out that.

 

[trbotaln]

Me and my friend went their about a week or two ago and they let us use a universal scanner that they had for free.

 

[BigAirSkier1580]

Just thought I would update, i did go over my wiring once again and I screwed up the MAF wires...

I straightened that out, and my Karmen readout is now working, CEL is off, and idle dropper 100 or so RPMs to a consistant 630 instead of 750.

 

[captd108]

yeah you always gotta double check that wiring, im glad it worked out for you. Did you use the wrong colors or have them backwards? Also if you want the idle at 750 you can just turn the biss screw at the throttle body counterclockwise i believe to raise the idle rpm.

 

[BigAirSkier1580]

Happy with the lower idle...

However, I apparantly still have something not right with it, my CEL came back tonite. I'm gonna get the code checked tomorrow and go from there.

At least the car still runs perfectly. !

 

[captd108]

hmm did u change any settings on it yet or nything? an did you make sure after you rewired it that it was set to 4 cyl with the arrow facing up?

 

[BigAirSkier1580]

First question, never made any adjustments to the fuel trims or anything. Second question, I never changed any of the settings, and it has always been on the correct setup for the car, so unless it somehow changed itself this time then should still be setup right, but I'll be sure to check and make sure tomorrow.

And on to more problems today...


Few things, on way to work today, car started misfiring in 4th and 5th at high speeds. Very oddly too. I could shift to neutral, let the revs drop go back into 5th, then get back on it and it wouldn't misfire. But if i simply let off the gas then got back on it would misfire again. I could also go WOT at lower gears no issues whatsoever. Did that all the way to work.

WEnt to Autozone on my break, scanned my CEL. 3 codes...One was an Idle Speed Control Sensor. NO IDEA why I have a code regarding idle coming up. My idle is rock steady and is right where it has always been.

Second and third codes were an EGR code and a random misfire code.

Now on the drive home tonite, it acted up for a few minutes, and then for the rest of the time the car was driven this evening, which was about 30-40 minutes, the car drove perfectly. No misfiring, or acting up at all.

I'm gonna CHECK the wiring again just to be sure, but I went over everything very throughly yesterday and made sure everything was in order, and it all is. And all is soldered and taped up securely as should be.

But does anyone have any ideas as to WTF is up now?

 

[97spyder maayng]

I also have the CEL on, but my car runs fine. Havent gotten it cheked out yet, but on my a.f gauge it says im running roughly mid stoichiometric (mildly open throttle), and 2 light rich at WOT...should i get a tune up?

 

[BigAirSkier1580]

Still No ideas as to what is wrong. Noone has been able to give me some sort of direction as to what is going on. I'm pulling the S-AFC this afternoon because I can't figure out what the problem is.

Does anyone have any clues as to why my car is acting up the way it is with the S-AFC?

-2g EPROM with 6 bolt motor. Stock fuel, intake and T25 turbo.

Car basically runs perfect, but then it will just misfire, whiel cruising. I can push the clutch in, hold it for a second, then release, and it will be fine again.

I have made no corrections to the S-AFC, and have triple checked the wiring over and over again.

CEL codes gives me EGR and random misfire- all cylinders.

Someone PLEASE.

 

[SilverEclipseT]

I have the same problem with my SAFC throwing a code. I have not gotten it checked out to see what it is yet because everything runs perfectly fine. If i reset my computer the CEL goes off. but the next time i go to start the car even without cranking the motor the CEL goes on. Im going to check the karmen Hz when i get home though even though i know the settings are right. Maybe I have a ground issue.

So for the N/T 420a it should be between 30-40Hz as well?