Originally posted by doctorsohc
As far as the fuel requirements for your EX (it would have a single cam VTEC engine), I'm pretty sure it needs 91 or better octane fuel (my D16Z6 in my 93 si needs premium according to the owners manual) When I first got the car I mistakenly put regular in it and it pinged like crazy, even though the timing was set properly. One thing I always notice in most honda motors is that they carbon up pretty heavily when I pull the heads off of them, especially when they're driven hard, or mostly in stop and go traffic.
I didn't think they put VTEC's in the 93 EXs. Maybe I'm wrong.:dunno: What year did the VTEC first come out? (obviously if he has a swap, then it's my bad)
But anyway, yes, if it does have VTEC, I would recommend >90 octane depending on where your timing is set at as well. If it's set at stock, I think >90 is just a waste of money. Other's will disagree or agree to this point. I havn't been persuaded either way as of yet.