I don't know how many billions times this has been asked, but how long/how many miles does it take (approx) for the ECU to fully rest after resetting it?

 

Do you mean adapt to your driving methods? I was never a believer in that theory, but what do I know

 

No I mean giving me back my timing after messing with knock sensor. Maybe I'm just paranoid. The only way I have to verify that is check for wheelspin at 40-45 mph in 2nd gear but even then it's hard to say. I want the car to be running at is potential for Saturday (track event).

 

Immediately. I do not believe in the "ecu adjusts to your mods (or anything else for that matter) over time" hooey.

There are two maps. The normal map and the low octane map (the ecu immediately switches to the low octane map if it detects a certain amount of knock).

 

Okay. I reset it using the 5-sec-left turn-5-sec-right-turn-5-sec-left-turn-5-sec-right-turn flathead screwdriver method. I don't want this crap again, the KS and the harness are both brand f*cking new, and I don't want to be running mid 14's with the sh*tty map Saturday, that would suck.

 

Either one of two things will happen, I can't recall which way the 4th gen does it:

The ECU will slowly advance timing from its default base timing (lets say 12 degrees BTDC) up to 15 degrees BTDC until the knock sensor registers knock. It will only do this during a closed loop operation

-or-

The ECU goes to a default base mapping (15 degrees BTDC) and will keep that base mapping until the knock sensor registers knock during closed loop operation.

SteVTEC can probably answer this question better as he has logged thousands of miles on his OBD-II scanner.

 

I've loosened the bolt holding the KS (I had previously left it VERY tight) and I'm not sure it liked that.

 

The screw is supposed to be turned to the left, counterclockwise when done checking codes.

 

Well in the Nissan Datascan and OBD Scan tech they both have a ECU option to clear the Self learn settings

 

I just realized that. I did the whole process again. What's wierd is that the light doesn't blink after the first right turn/left turn. It used to do it.

 

nah its always LEFT TO RIGHT, and back x 2

 

if it the same procedure as reading codes, and resetting the ecu. then its turn to the right till stop hold then to the left till stop hold

 

Just thought about this; maybe the bolt holding the knock sensor isn't tightened enough?

 

It's supposed to be torque'd to 25 ft/lbs or so, not too much more because then it will damage the KS.

 

But if it's too loose I think it might fool the ECU into using the crappy MAP.

 

I just drove 200 miles after I killed the battery and it cleared inspection this morning.

Neal, it actually takes about 200 miles after the ECU is reset to hit its 'full ready' state for all of the sensors.

 

Great, now I gotta drive 200 miles before Saturday.

 

When I reset the ECU then went to have the car inspected, (the day after) it failed so put some miles on that baby.

 

JClaw you dont have some sort of datalogging device? Sound's like you need one Would do you good to monitor your timing and all...

 

Yep, but having all the sensors in a full ready state is not related to power output. I've dynod 2 stock ECUs back to back to back, one that had been in the car for months, then one I never had in the car, then the same one that I'd had in the car and just removed moments before and all runs were within 1-2hp of eachother.

That's not learning over time, it's just taking the pre-programmed amount of time to bring all the sensors to whatever "full ready" parameter they are supposed to be at.

 

+1. That drive for hours crap is wrong. The ECU relearns info in a matter of minutes. If not less. Just to speed up the process i vary throttle position and load on the engine so the ECU can adjust, then a quick WOT blast for good measure.

 

I thought he was talking in general, not from the power aspect in which I do agree. It does have to "learn" and store what components of the emissions system are enabled and working properly.

I always thought the ECU picked up all of the sensors and they're state instantly upon ignition.

Jclaw, i didn't realize you were talking from a power standpoint.

 

Recommended torque which is 25 ft/lbs ( i think ) wouldnt be too loose.

 

i heard like a week

 

We all rive different distances in a week, so you're saying it's time depenadant .. or rather relative to mileage ... or are you jsut being a post ***** so you could post something useless once you get your 15th post