Reset Computer for Better Gas Mileage?

4'running'26

4'running'26

New member
Hey, all.

I just searched for over half an hour looking for an old thread which referred to bettering one's gas mileage after a noticeable drop. In that thread there was someone (for some reason I am thinking the username was one belonging to a woman but I may be mistaken) posted about how they reset their ECU by disconnecting the battery, letting it sit overnight, depressing the brake pedal the next day, etc, etc. There was a specific list of thing and I don't remember the all!

My mileage just took a big hit from one tank to another and as far as I can tell everything else remains constant. Last time I used the prescribed method by the aforementioned poster it worked like a charm! Just wondering if anyone knows the method I am referring to or could point me towards the exact thread.

Thank you to all!

JT
 
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by removing the ecu fuse from the fuse box you can reset the ecu and not lose saved radio stations or trip mileage., or just remove the negative terminal from the battery.
 
As I understand it ....

The computer that controls the fuel air ratio, what you are referring to, is an adaptive learning algorithm that learns slowly for every x miles driven.

When you completely reset it, yes it does start from new and in theory any changes like new exhaust / intake etc will be adapted for right away.

On the other hand since it is an adaptive algorithm if you drive it around for a few days it will adapt fully and have the same end result. Meaning you do not necessarily need to reset it and do not necessarily receive any actual long term benefit from reseting it.

That is what I know but I'm repeating what I heard/read. I don't have the links.
 
BrianSD_42 said:
As I understand it ....

The computer that controls the fuel air ratio, what you are referring to, is an adaptive learning algorithm that learns slowly for every x miles driven.

When you completely reset it, yes it does start from new and in theory any changes like new exhaust / intake etc will be adapted for right away.

On the other hand since it is an adaptive algorithm if you drive it around for a few days it will adapt fully and have the same end result. Meaning you do not necessarily need to reset it and do not necessarily receive any actual long term benefit from reseting it.

That is what I know but I'm repeating what I heard/read. I don't have the links.
Click to expand...

The good thing about resetting the ecu is if the fuel trims somehow get maxed out from lets say adding intake exhaust, they wont cycle and you will lose gas mileage. Sometimes that fuel trim will get stuck at 130% and the motor now can no longer adjust for the air coming in. At least thats how its worked on a lot of the 4 bangers I would tune. Wish I had a little palm device for my truck that would datalog everything for me like I had in my mitsubishi's.
 
TheFatGuy said:
by removing the ecu fuse from the fuse box you can reset the ecu and not lose saved radio stations or trip mileage., or just remove the negative terminal from the battery.
Click to expand...

its not the "ecu" fuse your looking for, rather the "efi" fuse, pull it for 15min and your good to go.
 
JimG said:
Because if you accidentally hit something you could ground your wrench too while working on the positive terminal, nothing is going to spark if the negative is already disconnected.
Click to expand...

...and, if your hand is on the wrench while doing the positive first and you touch a conductive part of the vehicle with another part of your body, you become a direct short. Nothing happens if you do this if you remove the negative first, on either terminal.
 
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