Mangia bene, vivi
AO Silver Member
Join Date: Jan 2011
Location: United Kingdom
I got this somewhere on this forum..
A techno wizard on sportsalfa.com has done a lot of work on this. Here is an extract on resetting from page 3 of the link below:
What I have since learned is that doing an ECU reset helps enormously after fitting a replacement. I have seen significant improvements in my trials over not doing any reset.
The best reset procedure (and reasons why) seems to be the following:
BEFORE STARTING: ENSURE THE IGNITION IS OFF AND KEYS REMOVED. ALSO, IF THE RADIO IS CODED MAKE SURE YOU HAVE THE NUMBER.
1. Disconnect the -Ve terminal of the battery for 45 min to let the ECU's 'working' memory clear. The ECU also has a non-volatile memory area where things such as the master keycode, faults and mileage etc. are stored that will not be cleared.
2. Reconnect the -Ve terminal after 45 minutes.
3. Put key into ignition and turn to MAR (don't start the car) for 10 seconds then turn to stop position. During this time DO NOT press the accelerator pedal. This step apparantly lets the ECU read the rest values of the pedal.
4. Start the car but again DO NOT USE OR PRESS the accelerator pedal. Let the car idle for 10 minutes without pressing anything. This step allows the ECU to calibrate the motorised throttle, idle and any other required warmup values.
5. Finally, after 10 minutes drive the car to your nearest favourite 'test track' and as the saying goes "Drive it like you stole it" for a while. This give the ECU a decent baseline for it's trim values matched to the engine and ancilliary components condition (such as a new MAF).
I've gleaned that little lot from various Alfa boards to find not only the most consistant instructions, but also the ones that actually were sensible and not "make sure the windows are down and you have odd socks on".
Good luck, I ve yet got to do my reset
Drive it like you stole it...