Reset ECU after spark plug change? [Archive]

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BADFISH6

11-10-2009, 06:27 PM

Is it a good idea to reset your ecu after switching to one step colder plugs?

FORZDA 1

11-11-2009, 04:28 PM

Is it a good idea to reset your ecu after switching to one step colder plugs?

Well, new plugs aren't going to affect the ECU/fuel trims unless the old plugs were fouled out and missfiring. However, it won't hurt anything to reset the ECU either, Whatever makes you happy...

BADFISH6

11-11-2009, 04:52 PM

Thanks, also is it 20 miles to let the ecu relearn your car or 100? Ive read both, but dont know which is correct.

FORZDA 1

11-11-2009, 06:17 PM

Thanks, also is it 20 miles to let the ecu relearn your car or 100? Ive read both, but dont know which is correct.

The miles isn't the key to the ECU learning, it is a complete drive cycle which in volves two cold start-ups. However, the ECU is pretty much done with fuel trims after 20 or so miles of stop/go in-town type driving with at least one WOT trip up the tach.