I did a motor swap in my 97 Prelude and now it won't start. I had Hydrolock in my last motor and now I bought a 99 SH motor. I changed the wire harness and I had to get a new key switch, but now it not starting. What could be the problem?

 

Check your grounds.

 

tranny or valve cover grougs may be loose, or your key may not have the immobilizer (if they even came with them).

Good luck,