You really don't even have to look at the code. Just look at the engine cover. A F23A1 will have "VTEC" on it, and a F23A4 will have "ULEV-VTEC" on it. The F23A4 is 2 hp/tq less than the F23A1. For what reason, I don't know. All I know is that I got stuck with one of them.
Thanks for the feedback. No thanks to you on the attitude. I am trying to gather information on a car that is 400 miles away. Excuse me for asking a question on a public forum. Oh yea, I did search...for about 20min. and wasn't able to come up with much.
Again, thanks for the detailed info.
Curt B. Shumaker
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