electronic tune-up

**paulosia** · July 10th, 2003 09:12 PM

yung distributor is for your engine timing, EFI is responsible for your air and fuel mixture. yung sa iba yung computer box.

**boknoyxtrm2001** · July 11th, 2003 09:30 AM

happy_gilmore.....

Sino dun..... kilala ko panigurado ko yon..... sabihin mo

**Sheep** · July 11th, 2003 10:07 PM

pasingit ha

boknoy anong batch ka?

**kinyo** · July 14th, 2003 02:34 AM

Originally posted by theveed
diba and EFI engine can only be tuned using a diagnostic tool? kahit anong kalikot sa distributor or whatever ibabalik lang ng ECU ang setting?

Originally posted by paulosia
yung distributor is for your engine timing, EFI is responsible for your air and fuel mixture. yung sa iba yung computer box.

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.

**theveed** · July 14th, 2003 10:21 AM

exactly what I meant kinyo... good post... I've seen a lot of attempted "tune up" of the ignition timing on EFI engines and no matter how you turn the distributor, as soon as you unplug the "short" wire in the diagnostic plug, the timing will always trot back to the ECU's settings... No amount of mechanical adjustment can correct that... I've seen the Nissan diagnostic tool work before, the tool, when plugged into the diagnostic plug of the car, can adjust timing, idling and all sorts of other settings in the engine management system instantaneously...

**boknoyxtrm2001** · July 14th, 2003 02:28 PM

sheep,

batch 94 po ako don nang highschool....... Masaya... ikaw po sheep

**Sheep** · July 15th, 2003 01:52 AM

boknoy batch 94 ka nag grad? ako batch 96 nag grad
since kinder ako dun hehehe
yes masaya

**scirocco** · July 5th, 2005 01:33 PM

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]

**kinyo** · July 5th, 2005 10:14 PM

scirocco,

there are a lot of possible causes of improper idling ... it would be best to bring your friend's car to a honda casa ... insisting on non-honda mechanic could result in even more damage to the car ... modern engines, being computer-controlled, are now too complicated to troubleshoot even for a seemingly simple idling problem ... lots of sensors and actuators that most talyer mechanics are not aware of

note that when the problem has been diagnosed properly, for idling problem, the fix may be as simple as cleaning some parts on the throttle/intake manifold assembly or injector ... when i had an idling problem few years back, the Electric Air Control Valve (EACV) was found dirty and only needed cleaning ... the EACV have a significant role in maintaining proper idling ... a loose contact at the fuel injector terminals may also cause erratic idling

so please tell your friend to go to a honda casa if he wants the problem diagnosed and fixed properly ... but be aware that even honda mechanics can err or too lazy in diagnosing a problem and may suggest replacing parts unnecessarily, in which case, you may have to find another honda casa with a more competent mechanic ... i've only twice experienced idling problem on my honda esi, not a single part was replaced

hth