Quote Originally Posted by G-Body View Post
Do you have a fuel level sending unit hooked to the PCM and in the tank? I know the 9405 OS requires the fuel level to work with the flex fuel sensor. IIRC it does read the sensor, however, it does not use the reading from the sensor to update the ethanol percentage unless the PCM sees the engine shut down, the fuel level increase, then the engine restart. I put a couple of resistors and a time delay relay in so that every time the car starts the PCM sees about 3/4 of a tank, then after a minute or so of the ignition being on it drops to 1/4 tank. Once I did that it would update the flex fuel percentage on every start. I`m not sure if the 2918 OS does that as well.
I do not have the level sensor wired through it. I will check with my buddy and see if he happens to. His truck is a 95 but he built an OBD2 24x harness for it.