Back on track
Join Date: Sep 2009
Location: United Kingdom
County: Greater Manchester
Strictly speaking, you shouldn't need an ECU reset after changing the MAF, but it would do no harm. Come to think of it, it would do no harm to do it before changing the MAF. I haven't tried one myself yet, but there are plenty of people on here that claim it's worked wonders on their cars. Even owners who didn't even know they had a problem. There are plenty of threads on here explaining it, but here it is again:
To reset the throttle and ECU.
Disconnect battery negative lead for minimum of 45 minutes (that is a MINIMUM, there is no maximum).
Reconnect battery negative lead.
Turn ignition key to MAR position but do not start engine.
Leave switched to MAR position for 90 seconds
Turn key to off position but DO NOT remove the key. Leave it in the off position for 90 seconds.
Start the engine and leave idling for 15 minutes. Do NOT touch the accelerator pedal during this time. If you do, the engine will not rev freely afterwards and you will have to start again.
After 15 minutes of idling, turn off the engine and leave for 10 minutes.
When the 10 minutes is up, start her up and take her for a spin. Try different types of roads and speeds. I believe this is to allow the ECU to reset itself to vasrying types of driving.
Hope this helps.