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Old 23 Jun 2004, 07:32 PM   #2 (permalink)
Nelson
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Join Date: Apr 2004
Location: South West
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Daz - well you can reset the ECU as often as you like but doing it too often would not be a good idea. The reason I say this is that once you have reset the ECU's parameters everything is wiped. The ECU now relearns knock correction amongst many other things Now if the ECU retards your ignition timing say for example because the car is running slightly lean or something then the ECU will make the necessary adjustments to allow for this......the car will generally feel slightly lethargic etc to cater for the knock correction and thus maintain engine safety. However if you reset the ECU too often then the car may well not being allowed to sort out its SAFE parameters before you reset them all again (hope this makes sense ?) If you are in this scenario then the car has a problem which needs to be sorted (a remap for example) not continuous Resets. Another thing to bear in mind is the early Impreza ECU takes a long time to reset its parameters if for example the ignition has been retarded having had a dodgy batch of fuel. The later ECU's 1998 onwards I believe relearn a lot quicker and can literally restore full power (after such an ignition retard) after a tank of good fuel....with the older ECU's it takes mulitple tanks to get it back to what it should be, this is another good time to reset the ECU

I hope this helps ?
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