ECU reset

[Timdog1650]

This is how you effectively reset your ECU, after a major power mod or some sort of boost or fueling change/increase i.e. an EBC or AFC:

-Unplug the negative terminal from your battery
-Get in car and pump brake pedal a few times, or until no electrical functions work (tail lights, dashlights, etc)
-let car sit for 45 minutes
-reconnect the negative terminal and take the car for a "spirited" drive, coming as close as possible to redline in each gear (BE SAFE!!!)
-do a cool down drive and make sure you use good gas from then on

[eulerfx]

I've also heard that the first time you start it up after you unplug the battery, you have to wait until it reaches operating temperature or the fan comes on. Then turn it off. Then on again and go for some spirited driving. It should take effect after ~2 tanks of good gas.

[EvilCerealBoX]

-reconnect the negative terminal and take the car for a "spirited" drive, coming as close as possible to redline in each gear (BE SAFE!!!)

uhh, don't let it warm up?

[Timdog1650]

Of course you let it warm up. Let me rephrase:

Reconnect the battery terminal, drive out of your drive way, let the temperature needle rise to about normal temperature readings, then drive spiritedly.

Come on guys, this is simple...it should go without saying you let your car warm up.

[Chance]

Can I ask what the "letting the car sit for 45 mins" is actually doing for the car? Why would you need to let it sit?

[Trainrex]

Originally posted by Chance
Can I ask what the "letting the car sit for 45 mins" is actually doing for the car? Why would you need to let it sit?

I agree. Hitting the brakes and/or turning on any elec. devices should drain any "stored" energy in the system.

[Timdog1650]

I relayed this information more on heresay rather than experience...we needed a stickied ECU reset thread in tutorial, so I made one up based on what I've read over the last 2 years and the search I did before I wrote it. Everyone says let it sit 45 mins. IF you can do it differently and get desired results, by all means....

[Trainrex]

Originally posted by Timdog1650
I relayed this information more on heresay rather than experience...we needed a stickied ECU reset thread in tutorial, so I made one up based on what I've read over the last 2 years and the search I did before I wrote it. Everyone says let it sit 45 mins. IF you can do it differently and get desired results, by all means....

Definately good sticky info

[Belial]

Will letting it sit for 45 minutes maybe cycle the battery or some of the computer components in the car?

That would make sense, usually with a computer it's not as long but maybe 45 minutes is being safe.

Just a guess.

[YBNormal07]

l have successfully reset the ECU using this method after waiting only 15 minutes. Confirmation by experience.

[Mr70StAnG302]

will re setting the ECU do anything if your ECU is reflashed?

[bboynems]

im tring this now due to the fact i never did it and installed new header and up pipe along with a cat back hope it works well

[rr1911]

the new ap does it for you

[YBNormal07]

To clarify, since this is a pretty old thread:

An ECU reset does not require a time period to wait after the battery is disconnected. Just disconnect it, tap the brake pedal, and reconnect it. You are done.

For maximum affect, after resetting, get on a open surface with no traffic, place the car in 3rd gear, increase throttle, and slowly let up on the clutch while brake torquing the car (don't let it move). The object is to increase boost for a time frame of around 5 seconds. This will maximise your ECU settings such that you will immediately gain a good 20 HP over the "worn" stock ECU settings. The background is much more complex than this, but this does work.

[rr1911]

To clarify, since this is a pretty old thread:

An ECU reset does not require a time period to wait after the battery is disconnected. Just disconnect it, tap the brake pedal, and reconnect it. You are done.

For maximum affect, after resetting, get on a open surface with no traffic, place the car in 3rd gear, increase throttle, and slowly let up on the clutch while brake torquing the car (don't let it move). The object is to increase boost for a time frame of around 5 seconds. This will maximise your ECU settings such that you will immediately gain a good 20 HP over the "worn" stock ECU settings. The background is much more complex than this, but this does work.

thanks for the info... i will have to try this now