Reset ECU after adding a CAI?

[tlej@live.com]

Is this a good idea? Someone at Advance Auto Parts told me if I bought a cold air intake; I should reset the ECU by disconnecting the battery..

[uglygc2]

to be completely honest to get a real performance gain from a cai you would need to dyno tune. if your car has never been tuned to altitude the cai might not make much of a gain. resetting your ecu wont help much if at all, but according to parts manufacturers you should replace your coolant for some reason i never really grasped.

[tlej@live.com]

Yeah I really don't see any gains from a CAI besides 2hp or so.. I don't see how some companies claim up to 28hp ... Ridiculous.. I just wanted the extra sound.

[1990exr]

I bought a CAI and I use it as a SRI because I like the sound, CAI doesn't sound as nice

[deevergote]

You don't need a tune for a CAI. That's absurd.
Yes, reset the ECU. You should reset the ECU after performing any engine work, so it can recalibrate. Pull the radio/backup fuse for a few minutes, and/or disconnect your battery.

[tutsuo]

You don't need a tune for a CAI. That's absurd.
Yes, reset the ECU. You should reset the ECU after performing any engine work, so it can recalibrate. Pull the radio/backup fuse for a few minutes, and/or disconnect your battery.

And allow to idle for 15 min.

[1337EJ1]

You can made a re-learn

ECU Reset just remove the Defaut Code

ECU Relearn make a relearn of the long o2 trim

[Quashish]

[GhostAccord]

ECU reset also zeros the long term fuel trim. That is exactly what you want to do when altering anything on the engine induction, fuel and exhaust systems. It learns from scratch.....

[deevergote]

Re-read what he said. He's from France, so his English is a little broken... but what he said makes perfect sense.

[Quashish]

So whats the difference between reset and relearn? And how do you do a relearn? When is this necessary as opposed to just a reset?

[deevergote]

Same thing. When you reset the ECU, it relearns.

[GhostAccord]

The relearn is what happens after an ECU reset......

You start the car without any accessories running and without touching the throttle or the brake. Run it until the engine is at operating temp and the fans have cycled twice. At least that's how I have always done it.

[Quashish]

Ok thanks that one post got me confused even after reading it several times

[1337EJ1]

Sorry for this.

I just explain the "term"

And yes, if you make a reset it make a relearn but the two are different