Flatspot 04my STi+Prodrive.
 

My quite standard car has recently developed a flatspot at around 5750 when booting hard (ie all the time!), it leaves at about 6/6100, but this os obviously not right.
Returned to dealer who says there are no faults, fitted new standard air filter, no change, tried Texaco Super, Optimax, no difference.
Car has done 17k, only me as the driver, so I know no bad things have happened to it.
Any clues?
Please help.
Thanks.
Rob.:confused:

Did your dealer reset the ECU for you?

Had the same prob with my my03 sti ppp. No apparent faults etc. 2 weeks later took it in for a service and the problem seemed to dissappear.

You'll find that the ECU has picked up some detonation around 6000rpm, probably due to fuel surge. As you can't hold it in that load site for long enough it's difficult for it to relearn at that site and put the timing back in now there's no det there. The easiest and quickest way is to reset the ECU and the timing will go back in.

Mike

Any "user" reset available? Or is it a dealer job?

Thanks for your help.
Rob.

just been reading this myself
hope it helps
http://www.subaru-impreza.org/subaru...pic.php?t=5813
damn just tryed it you will have to reg sorry

Mike,
Can a new age ECU (MY03 sti for example) be reset by removing the battery overnight, or does it require the dealer ECU diag tool.

Cheers
Dipster

Dipster

Removing the 12V supply for a period of time will do it. Remember that you'll lose the radio codes etc if you disconnect the battery, may be better to disconnect the ECU itself.

Mike

Thanks.

Dipster

so can i disconnect the battery and leave it over night??