Powerfc Doesnt Learn To Idle (gtr V-spec)

[Fredde]

Tried to search but didnt find any good answeres..

Installed my Power fc today and started the car, got a good idle after a while and 10 min later i turned on the aircon.

The idle bounces between 400 and 1200 rpm and dosent stop.. somtimes it idles fine for a while but starts bouncing again, oftenly at the same time as the ac turns off.

had the car running for 1,5h but it doesnt get better.

Does anyone have a solution?

Car is R33 GTR V-spec with basic mods, filters, exhaust, larger ic.

/Fredrik

Edited May 17, 2007 by Fredde

[GTR1993]

I had the same probem in some of my cars with a power fc. I found the learn doesnt really do much. You need to tune the load cells where it is bouncing. I found that adding some fuel to the cell where the revs dop can stop the idel dropping. You can fiddel with it or bring it to a tuner should be fairly easy to fix.

[paulr33]

how strange. do you see anything wierd in sensor sw check when the revs are going wonky?

whats battery voltage like when u are doing it? have u done DATA INIT and tried it again?

is the engine warm when u try it ? what if i try it again and skip air con test and just let it do its self learn idle

[Fredde]

how strange. do you see anything wierd in sensor sw check when the revs are going wonky?

whats battery voltage like when u are doing it? have u done DATA INIT and tried it again?

is the engine warm when u try it ? what if i try it again and skip air con test and just let it do its self learn idle

Not what i can remember, the only activity in the sw check is the ac switching of, then the rev drops and starts bouncing.

didn´t check the battery voltage, the batt is quite new so i doubt that it would cause the problems, can check it again though.

I also tried to reset and start all over again a few times without any changes.

The engine was warm when i did the self learn, will try without switching the aircon on.

Is there any sign from the pfc when the self learn is finnished or that the self learn have started/is processing?

I also saw some people having problems when they had a a-lsd, could it be related to my problems since i have a v-spec?

But that was more about the a-lsd light, mine doesnt show anything strange

Regards

Fredrik

[paulr33]

the self idle learn takes 30 minutes approx

there is no signal or notice of when its finished, u just have to let it idle unforuntately

try doing it again but skip the aircon part and just let it idle. then once done power it off, back on ensure idle is stable.

then try and turn on the aircon see how that goes

the a-lsd issues with the PFC only appies to the GTST with the active lsd fitted factory

as the gtst PFC does not relay the TPS signal to the a-lsd puter in the boot, you wont have this issue on your GTR

[Fredde]

Ok, will try without the aircon later today (it´s still early in the morning here in Sweden).

Oh, forgot to ask in the last post..

Should i see any changes at the idle point in the ign/inj maps after the idle is set or where does it store the "self-learned-idle-stuff"

Thanks for the help

/Fredrik

[paulr33]

the self learn idle stuff is somewhere in the nvram

you cant see it on the hand controller unfortunately

[STATUS]

a quick tune will have it sorted, it is quite common. No need to stress.

[Fredde]

Problem solved!

Did try to redo the idle setup but had the same problem, even without anything on..

Added some fuel to the idle cell got rid of the rev-bounce so i did a complete reset and added fuel to the idle cell before i started the car.

After that everything worked perfectly.

Thaks to everyone who answered

/Fredrik