VIII patch to reset fuel trims?
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
I am using the 96940011 (05 evo rom) and yes I am still interested! You are gonna have to break stuff down for me Barney style though cause I don't know jack about dissassembly...
Last edited by Fast_Freddie; Aug 12, 2009 at 04:09 AM.
Evolved Member
Joined: Mar 2008
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From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
Untested with no warranty, try it on your own risk, you have been warned 
Here is prepatched stock 96940011, it is WinRAR archive due to limitation of 100kB upload.
So copy all your tunes to this one. If you use some other things like KnockCEL e.t.c
you will loose them, but this ROM is full of code so I doubt it.
To reset fuel trims one has to send CA custom request from EvoScan, MUTMonitor.
Here is prepatched stock 96940011, it is WinRAR archive due to limitation of 100kB upload.
So copy all your tunes to this one. If you use some other things like KnockCEL e.t.c
you will loose them, but this ROM is full of code so I doubt it.
To reset fuel trims one has to send CA custom request from EvoScan, MUTMonitor.
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
okay just tried this out (without resetting fuel trims via battery) opened evoscan and began logging, sent custom request CA thru evoscan and got a response, deleted CA from the box, and let the car idle for 15 minutes... no change in fuel trims...
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
Here is a screen shot so you can see the reply... The log is too big and I can't break it up to zip it either... basically I let it idle for 10 minutes then entered the CA request, then let it idle for another 15 minutes and no change in the fuel trims...
You could just reflash, and let idle for 16 minutes... I have an 04 and have done the MAF scaling and that adjust the idle etc. Let it idlef or 16 minutes, the injectors will go through their cycle, and the fuel trims will adjust...to the new map settings that is.
Evolved Member
Joined: Mar 2008
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From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
Ok I will give it another shot, the command was not executed at all when looking at the reply.
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
Thread Starter
Joined: Jun 2007
Posts: 2,706
Likes: 15
From: Lexington Park, MD
The VIIIs don't reset the fuel trims upon flash, you have to disconnect the negative battery terminal... as in going back to "0" and letting the trims readjust
Thats why hes letting it sit there for the 16 mins....at idle after that time thats roughly 4 cycles and the trims should have already started to adjust.