accel dfi problem

[Jim Nilsen]

Are you watching right above the correction bar and seeing it go ACTIVE when it goes to -25 and back and forth? The ecu will not correct anything in open loop when it is cold and as soon as the correction bar goes active it is closed loop.

Once you are in closed loop/active you can correct the VE table to bring it to the center. You can use your AUTO CAL button to have the computer place the value that is closer and then manually adjust it until it stays in the center or as close as it will until you work with the A/F ratio to give it what it likes. Also watch the timing and see if it is correcting itself to stay running, the computer will retart or advance timing to adjust for the idle. You can also work with IAC to smooth it out some and make it so it all stabilizes.

There is a lot to look at when you are learning and it takes a lot more than just the 3 tables to get it right, especially down at idle.

Are you running a wideband or a Hego? The wideband will tell you the actual A/F ratio even in open loop before the computer goes Active. This really helped me a lot to know how things were at start up. It does however make you have to think more about what the engine wants in the A/F tables at warm up and it all changes as soon as it goes to closed loop if they aren't all working with what the engine wants.

Hope this helps and remember that I am just learning too and am just telling you what I am doing to tune and there may be easier ways. I can say that the tune I had before I blew my engine was doing real well for me being a beginner and everyone who heard it and rode in it was impressed as to how it ran. The new engine is a different animal and is making me go back through it all again. You also have to work with the TAU table and you acceleration modifier for your drivability.

Good luck