Originally Posted by umop-apisdn
Incorrect.
1. VTEC always engages at a specific RPM
2. The vehicle has to moving over a certain speed. IE you cannot engage VTEC while revving in neutral.
3. Coolant temperature must be over 60c.
4. ECU must not be in limp mode.
Mine seems to vary though. :dunno:
I am pretty sure it used to engage a little over 5000, now it engages a little below 5000, and it'll change sometimes. Is the tach signal for the ECU the same as for the gauge?