hello everyone. i just purchased my fc and on the drive home it started doing some weird things. under full throttle itll have power, smooth, but itll be lumpy power- as in plataues. the problem is partial throttle, when giving it partial throttle the power is abit hesitant, and around 6-7krpm the car will basically go on off on off power making the car rock forward and backward violently as if your launching over and over. the car has a SAFC installed (not really tuned), and a race chip int he ecu that i have no idea what it does. im thinking about going back to the stock ecu and just getting the SAFC tuned, since the car has a streetport, intake, and exhaust- i beleive the safc should be enough without a chip to take care of it. also there are many hesitations and what almost feels like holes int he map. anyone have any suggestions? thanks
russell

 

is there still an air pump???

and it sounds like the SAFC is probably not tuned and interfering with the chip. Thi is the case of that there should be one or the other, not both.

 

I'd say put the stock ECU back in it and get the SAFC tuned....

Sounds like you are leaning out... under light load and boggin under hard load or Vice Versa..

 

Step one is to put the stock ECU chip back in, and tune the SAFC to 0% correction everywhere (both low and high throttle maps) (and make sure it's set properly with the correct sensor types). This will eliminate ANY correction. If it fixes the problems, you have a good base to work from. If it *doesn't* fix the problems, you can then troubleshoot from there. Loose connections to the SAFC may be at fault, or there may be other things, but you can at least eliminate some possible issues.

-=Russ=-

 

is the hestitations and all hurting the motor at all?

 

could be radically hurting the motor is the hesitations are from detonation.

 

i had 91 in the tank, and it was NA, how would it knock without boost? i didnt think nas could detonate unless u relalllly screw with them

 

You could INITIALIZE the SAFC. In other words neuter the thing.

Page it til you get to ETC.
Go down the ETC list til you see INITIALIZE.
Hit NEXT
The screen will show YES/NO
Select YES, then hit NEXT.
Then turn the key to OFF and after a moment back to ON. Your done and the SAFC should not effect your ECU

Or in your case, prior to doing the above, I'd download the SAFC manuals from online. Then I'd go to ETC.
From ETC go to Sensor Chk.
With the key just to ON and the engine not running write down the values for *In-1* and *Thrt*. Then start the engine and see if they change quite a bit. If they don't change it's possible you have a *Open* on one of the signal wires.

For the manuals, find SURESHOT on this site and you'll find he has links to the SAFC manuals.

Another thing that is simple to do is to get a meter out and see if your ECU is getting the signal from the boost sensor or NOT. Back probe the signal wire at the ECU and look at the value with the key to just ON and then with the engine idling. By doing this you should see a difference b/t the engine running and not running. A large difference.

I'd do the above with the stock ECU. It could also be that the SAFC has been installed in a halfass, wooly headed way. Which by the way is how the manuals for the SAFC were written.

 

i put the in and out on the flapper to 6, that helped abit. its still stumbling, just less. its also reading 200 rpms below what the tac reads. which is wrong???
i have it set to 4cyl, and im unsure if the throttle arrow should be on up, down, or the third option. does anyone know what the vaccum should be set to? i think its in the 700's atm. my throttle sensor also doesnt change much volts from on and off, maybe .05. im getting stumbles around 4k and then the car shakes at 6-9k as if its me going on and off the gas. could this be my alternator or my ignitors?
one more thing- it seems to be running better with just one map, instead of using a hi and low throttle map. i dont know why. doing this i set the low throttle map to under 10%. does anyone have the manual to safc or a link to it? im not sure if im supposto teach it my tps or what cause i didnt. it seems to say 40% throttle when im at 30% cruising as well. please help! russell

 

also when i put the stock ecu back in+set corrections to zero it still hesitated! im not sure what the deal is!

 

3.8K hesitation or worse?

 

yes i get 3.8 stumbles, then after 6 it violently shakes, sometimes, mostly under partial throttle or letting off. full throttle is fine, but i need to modulate the gas

 

Go to INITIALIZE. Select YES. Hit PREVIOUS. Turn the key to OFF. Turn the key to ON and drive the car. After you INITIALIZE the SAFC it should have NO effect on the preformance of the car UNLESS it is wired *** backwards crooked.

The ARROW should have been UP AND TO THE RIGHT just like the manual said.

I'd get me a digital meter and backprobe the BOOST sensors signal AT the ECU and go for a boosting session. The voltage should never go above approx 3.65 vdc. If it does, then the FCD ain't a working right and needs calibration.

 

hailers, it still hesitated with zero comp, but that could have been the wrong af meter slected. another thing is is its 200ish rpms off. is the safc wrong or my tac? how do i check out if the connections are ok?