Quote Originally Posted by kinyo
For the honda esi and similar engines, the major function of the computer is to control both air/fuel mixture and ignition timing.

To control air/fuel mixture, sensors like O2, throttle position, etc. serve as inputs and the computer determines the proper duty cycle for the injectors.

To control ignition timing, sensors like TDC, crank and cyl located at the distributor serve as inputs and the ECU determines proper timing. The ECU do have the capability to adjust for proper timing even if the distributor was mechanically misaligned. In some cases of sensor failure, the ECU can still make the engine run at slow speed, enough for a trip to repair shop.

Electronic tune-up is called as such because the shop uses electronic gadgets to monitor engine parameters like rpm,dwell, high-voltage waveform, etc. Technically, there are no electronic adjustments done on the system. The only significant work done is valve adjustment. Honda casas have a diagnostic tool that they could connect to the ECU to monitor various sensors but they only use it for troubleshooting difficult problems, not for routine tune-up.
[COLOR=Navy][SIZE=7]FONT=Century Gothic]mga sirs,

Please help!

any one knows good mechanic or shop that can tune-up my friend car Honda vtec '96.

problem nya di accurate ang idling. before may mechanic na gumalaw pero di rin nakuha. na adjust distributor, air and valve adustment pero ganun parin.

please advice asap.

many thanks in advance.[/FONT][/SIZE][COLOR]