Ive searched this before but really couldnt find what i was looking for. Can anyone tell me all the things that come into play when it comes to vtec kicking in. I know it has to do with the proper oil level/pressure and temperature... but what else is involved? when i first bought my ex, the speedo didn't work, so naturally the vtec didnt work. Well when i fixed the speedo, the vtec still isn't kicking in. I have enough oil and the car is running at the proper temp. I even switched out the vtec solenoid with one that I knew was functioning... any thoughts?