I think the easiest way would be to make a pulse stretcher.. Rewire all the injectors to the inputs, and make the injectors stay on longer. I think that would let you avoid tapping the CPS and Ign wire. You'll still need some way to determine how much longer to stay on, but that should be more trivial than reinventing the whole injection sys. Just my .02 andrew -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist