Toyota 4 Cylinder Engines Schematics

Toyota 4 Cylinder Engines Schematics - Changing any one of these (VR polarity, ignition input capture edge) changes the actual trigger point, so the timing should be 're-calibrated'.. If you are not familiar with tuning EFI systems, you might want to review the material in the Principles of Tuning page before reading this web page. Tuning Theory. Tuning involves setting all the parameters that your MicroSquirt® controller uses to be optimal for your non-pollution controlled engine, injection components, and driving style.These include things like cold start pulse widths.