Hi everybody!!!! I´just bougth a civic-ex 1992 with ´97 engine it say d16y8, the problem is i cant locate th iac valve....can you tell me where is it??? and the speed sensor to.....could you help me with this??? cuz i long as i know the vtec dont came on until you get some rpm´s, some speed, and, if i dont get the speed in my dash, or the ecu, i will never going to fell the vtec....it´s that truth??? thanks in advance!!!!

 

vtec is controlled by rpms.

 

i dont think youl feel vtec much on a SOHC, i have same motor and i can hardly feel anything if at all... just noise... lol. youl hear it tho its supposed to be smooth transition, but ive heard from a friends type r teg he can feel it, its a DOHC, and yes its controlled by a few things like the rpms as flatliner said, oil pressure and engine temp...

 

Thanks guy´s!!! its really helpfull, a by the way...I already know where is the iac valve, its below the intake....Thanks again!!!

 

Three criteria need to be met, over a certain speed, like 15 mph, water temperature above a certain amount, just short of operating temp, and engine rpm over whatever the engagement point is, anywhere from somewhere betweer 5000-5800 depending on the engine.

 

Temp sensor
speed sensor
Knock sensor
and one more

if those things to not register to the ecu you will not get VTEC.

There are like 1 or 2 more but can't remember.