Looking for bin, 350 tbi with th400.

[Fabbe]

Hello, i have swaped engine in a K2500 -88. The old engine was a 305 tbi and the new is a 350.
I am having trouble finding a bin that works with the th400 (it wont kickdown) does anyone know where to find?

Also, what does "california" mean, i see some bins that have it in their names, i guess it has something to do with emissons right?

//Fabbe

[fastacton]

I think AKWA is the one I've seen the most with a 350/TH400 setup. You can find it (and others) here:

http://www.gearhead-efi.com/Fuel-Inj...Information-4F

Yes, California is primarily for emissions. If you still can't get it to kick down, you'll probably want to go through the wiring. Most of the harnesses I've pulled from trucks with a 400 in them have bad wiring going to the kickdown. Personally, I prefer a separate kickdown switch, I've been using one for years on my Blazer.

[Fabbe]

Thanks! But will it work with a 1227747 ECU?
I know that the wiring is ok because it works with the original ecu (747) but the motor runs bad.

//Fabbe

[fastacton]

I don't know if that will work with a 7747 or not. I'm fairly sure that there are 3 speed automatic bins in the 7747 thread as well. If those don't work for you, I don't know what the problem could be. The TH400 tunes are pretty old in comparison to something like ASDU, I'd just go with that and rig a separate switch and then start tuning. Maybe someone else here has a better idea, though?

[Fabbe]

Ok, i will try it and see. And you are right, a switch is a easy workaround.
Really appreciate the help!

[Fabbe]

Ok, so $4F in a 7747 does not work. The SEL started blinking and when i burned a new chip with ASDU $42 it kept on. Think i burned my ecu, good thing it was free! ;)