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what are some test to see why this 93 teg will not fire? i've followed the haynes manual for the car, all of its checks seem to be ok. the plugs are fine, the wires are ok. the distributor cap and rotor are fine, I checked the coil, it checks ok. power is on all the wires inside the...

sorry for sounding stupid. I've heard of vtec since it came out, and I know vtec stands for valve timing electronic control. but I want to know exactly what goes on when vtec is activated. does it really change the valve timing? how do you do that with the engine running? is it...