Ok, my idle is way too low. Its about 500-600. I checked the FSM and it said to check the BAC. We followed the steps... when 12v voltage was applied it clicked. The ohms were at 12.9 though and the range is 10.7-12.3. Is this what my problem is? Do i need to replace the BAC valve? Anything else that could be causing my idle...

thanks
matt

I HAVE A 1990 TII... i just recently installed an s-afc and 720cc secondary injectors, i havent got it dyno tuned yet. I did however do the basic settings but could this low idle be because of not getting it tuned yet?

 

Well, at least you know the coil's not open, lol...

My best guess is that the BAC should be working, but may present an abnormal load to the driver circuit in the ECU. This is assuming that you're using a calibrated meter...

Having said that, electrically, there's not much difference between 12.3 and 12.9 ohms, especially on a 12v circuit. Also keep in mind that the tolerances of most home-bought meters are such that there is effectively NO difference between 12.3 and 12.9 ohms. There is also the possibility that the internal battery in the meter is not fully charged (this battery is the "driver" to produce the current that the meter uses to display those resistance readings).

Long story short, I don't think the BAC is your problem...

The duty cycle CAN be checked out at the ECU with the engine running, BTW, to verify operation. Use voltage readings for this....

 

fair enuf, wayne can u read my edit plz

 

Uhh, yeah...That's the answer to your "edited" question

 

ok this may sound stupid but, i thought that secondary injectors dont kick in until like 3000rpm or so... so if i didnt touch the primarys wouldnt it not matter?

haha just curious about this.

 

But you DID install an AFC, right? And the funky idle started right after that install, right?