Power Fc Losing Memory? Anybody Had This Before?

[RORZ_JZA70]

Hi,

I have an apexi power fc. My car ran fine before fitting the pfc but i wanted to be able to tune so on it went. The tuner tuned everything on the dyno and i picked up the car. It ran perfectly when I picked it up but it's tune slowly decreased over time until the point where it would barely idle and was running really rough. It has been back to the tuner several times to be re-tuned but just does the same thing. Last time the tune started to go bad the hand controller went to the startup screen (instead of the 8 channel monitoring screen i had it set to) started running worse and worse. Then the hand controller screen went blank and altho the car would drive it wouldnt idle at all. I had to keep the revs up whenever I clutched it just to get it back to the tuner. He then loaded the maps back onto it with datalogit and the screen lit up again and everything worked fine but an hour later, losing tune again!

My cousin also has a PFC tuned at the same workshop and he has none of the problems.

Anybody had this before?

Any help would be appreciated.

[paulr33]

covered in the powerfc FAQ ->

See:

http://members.dodo.com.au/paul/docs/power...powerfc-faq.htm

Technical Issues

53. When I turn my car off I loose any changes on the PowerFC! Help!!

[Thunderbolt]

Re. The hand controller going to startup screen or blank. This can be caused by a loose connection, often between the hand controller and PFC. If this connection is loose, it won't cause above problems, however it could mean that another connection is slightly loose.

[paulr33]

the hand controller going to the startup screen is a side affect of the original problem. as it cant save any changes each time you power the car off it defaults back to factory settings which is, it loads to the MONITOR, SETTING, ETC menu. usually when you are viewing a particular screen and power the car off the PFC saves where you are at and resumes when you start it up again. this info is stored in nvram on the FC.

if it cant write to this nvram then it just defaults to the main start screen each time. The PowerFC FAQ covers this problem and the likely causes

[RORZ_JZA70]

the hand controller going to the startup screen is a side affect of the original problem. as it cant save any changes each time you power the car off it defaults back to factory settings which is, it loads to the MONITOR, SETTING, ETC menu. usually when you are viewing a particular screen and power the car off the PFC saves where you are at and resumes when you start it up again. this info is stored in nvram on the FC.

if it cant write to this nvram then it just defaults to the main start screen each time. The PowerFC FAQ covers this problem and the likely causes

the thing is that it isnt doing it when the car is switched off. It will start and run great, then slowly over 30 mins of driving lose tune. Sometimes if you switch the car off after it has lost tune, it gets better again when you restart it (if its had time to cool down). Then over 30 mins or so it'll start to run like shit again and idle like a pig.

[paulr33]

interesting so you can drive it and it progressively gets worse?

what battery voltage like when this is going on?

what does sensor SW reveal when you see problems? (anything in black)

[RORZ_JZA70]

yep, drives well at first. Light throttle, mid throttle accel and full power all nice and smooth. The it slowly gets worse until it's running like a busted arse and wont idle.

battery voltage around 13-14V

no sensors highlighted in black. ive tried turning the O2 sensor off. Didnt help.