Ive just disconnected the Battery and will leave off for 1 hour. When I reconnect Ive heard the ECU goes into Self Learning mode, what does this do? Should I drive normally while it does this, or do I thrash it? Does it really matter.

 

 

Thanks in advance.

 

 

Barry.

The ecu is always adjusting the fuel mixture its not something that only happens after disconnecting the battery. Just disconnecting the battery resets it to the default factory new setting and it then learns its way from there back to the optimum for that particular engine and tolerances for lowest emissions. So in that sense you might suddenly feel a difference - more likely richer mixture since with mileage on the clock comes some wear in injectors etc so that more fuel is injected per unit time. The self learning will sense its now running richer than it should and compensate it back to where it was after some miles of experience. For a short while you might find it more responsive meanwhile its not quite as clean on emissions as it should be.

 

I think.