you can hear a deeper note with my ej8 once it kicks in wouldnt say its a huge difference... tell him to get a new engine like i am haha only way to truly appreciate it ..
I'd hook up a light just to be sure. There's a DIY about it in the DIY section. If there was a loose cable the engine light would come on when it tries to engage vtec and realises it cant or even when he just turned the car on. One of the wires to my vtec solonoid came loose one day and triggered a code 22. I checked the wiring and found the problem pretty easily. Could be an oil pressure problem or something too
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