Quote:
Originally Posted by alan.chalkley
Mine was running fine until the local subaru dealer did the 18 month 30 000km free service . When i drove it home it kept stalling on idle.
I took it back and they reset the ecu back to learn mode.
Now i have to drive it hard for the next 100km to get the throttle response back.
I suspect this happens when they start the engine with something unplugged (maf sensor).
Or maybe used too much throttle body cleaner and fuel additive.
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The ECU is always in "learn mode" it constantly learns fuel trims and knock correction adjustments . Reseting it just sets it back to default and it will get back to same state with or without a reset. A reset will just clear stored CEL codes.
Driving it hard to make it learn also seems incorrect. The ECU learns fuel trims only in Closed loop fueling mode, when your driving sedately with slow or no throttle movements. during aggressive driving its in Open loop mode and does not learn fuel trim corrections, just applies what it learnet in Closed loop mode.
My guess if it was stalling at idle the dealer left something unplugged or dislodged something during service likely an intake tube/hose/sensor, and they made up the "learning" rubbish to cover their mistake.