I searched but couldnt find a definitive answer. Maybe i read too much where I was getting conflicting opinions.

Basically, when I kick on the AC, the car bounced idle. I know I need to set the PFC to relearn, but I dont know how. As such, I've come up w/ 2 questions & 1 request.

Questions:
1) Where can I find out how to force my PFC to relearn the idle process
2) Can I do this without losing my map (as i have no datalogit).

Request:
A nicely detailed How-To process would be great.

Thanks from a n00b!

Steve

 

Disconnecting the battery, restarting the engine until it warms up with no loads, then running with only electrical load (no A/C), then A/C for a few minutes should relearn.


If still bounces, adjust the Throttle Body Air Adjusting Screw (out-more air, in-less air) until the bounce goes away.

But then maybe your idle set points are wrong.

 

To Reset the PFC, you have to use the hand commander, you should find it in the third section. Reset it. Cut off teh battery, push the brake and then reinstall everything and start the car. let it idle for approx. 10 minutes, turn on the rear window defroster and let it sit for 10 min. again., after this, turn on the A/C and again the same procedure. rough idle even after this should be fixed, assaid, via the idle adjustment screw. it sits under the intake elbow and should be opened 1/2 to 3/8 counterclockwise.

 

metalCORE, I dont want to reset the PFC b/c then I'll lose my maps.

I want it to relearn WITHOUT losing my maps.

Steve

 

I'm having a similar problem to revsteve. My car idles great with no-load and load, but hunts with AC. I've tried adjusting the Throttle Body Air Adjusting, both increasing and decreasing air. All I seem to accomplish is change the idle speed but the bounce doesn't disappear. I have searched, but haven't found much more than "adjust the throttle body air" or "search". In fact, searching finds more posts that just suggest searching than anything else.

Any suggestions?

 

If changing air does not work, have you tried changing fuel?
Is the O2 FB switched on, is the air pump on and working, and has the fuel correction been re-calced? There are many thing that can affect idle.

 

Disconnecting the battery will not erase your map! Here's the way to make the car "relearn."

Step 1 - Disconnect the battery and let it sit for 10 mins. After that 10 min period get into the car (battery still disconnected) and "flash" the highbeams, "honk" the horn, and step on the brake pedal for 10 seconds.

Step 2 - Connect the battery.

Step 3 - Use dataloggit or commander to set "desired" idle at each setting (I recommend 750).

Step 4 - Go underneath the throttle body and close the air adjustment screw COMPLETELY CLOSED.

Step 5 - Start the engine.

Step 6 - Turn on the radio, rear defroster, and hazard lights. Now let the car sit for 5-10 minutes.

Step 7 - Turn on the AC. Let the car sit for 5-10 minutes.

Step 8 - Turn off car and restart.

Step 9 - If idle is not crisp adjust air adjustment screw on the bottom of the throttle body SLOWLY until the throttle is crisp.

If you did make an adjustment to the air adjustment screw (completely normal) I would let it sit for 5 more minutes. I've done this order on my car and several others and have it works flawless.

This also may be a time to calibrate your tps sensor. If you want the specifications for that let me know and I'll post the procedure for doing so. Good luck

 

i dont think any of the above answers are correct?

the apexi documentation clearly states the only way to relearn the self idle is to perform a DATA INIT (youll loose the map data) and then restart the car. this is the only known way officiailly to start the self idle learn procedure.

i have NEVER heard of other magical ways such as flashing headlights and disconnecting the battery. the tune data and idle is stored in nvram so loss of power achieves nothing.
even disconnecting the battery and using up elec charge in the system will not reset the self idle tune data.

to the flashing lights guy - where is your source for this procedure?
does this only apply to RX7 PFC or all PFC's ?

 

I beleive flashing lights, stepping on brakes, etc - is just way to ensure that you got all capacitors discharged (after battery disconnected) so PFC will think that electricity was disconnected

 

my power fc idle hunts everytime i make a complete stop but when ever i turn on the a/c it idle's nice and smooth.

 

I agree with PaulR33 on this one. He is very knowledgeable on this ECU. Unfortunatly there is no way to relearn your PFC without a hard reset. Think of it this way. If you disconnect your ECU and sell it to someone else, all your settings are saved period. Hook it up to a different car, it will not go through the relearn process. That would be the same thing as disconnecting the battery, to a further extent. You could almost prove this by looking at your injector screen, there is a duty cycle and another number to the right of that. Usually defaults to 255. You cannot change this number, it is something that your ECU learns over time and corrects itself. If you were able to "relearn" through one of these above procedures then this number should also default back to 255.

 

just remove the PFC from the idle process, literally to me 5 mins to set it so it idles perfect now.

not the proper fix but as long as it works