I received an email from a fellow who dropped a JDM H22 engine into his ’94 Prelude Si 4WS. He mentioned having engine performance issues when he used the JDM H22 ecu (P13)  –  ie. ignition issues, car revs up slow – vehicle feels sluggish – and backfires. He also mentioned that he retained his Si (H23) engine wire harness, ignition (distributor), and injectors. It dawned on me, and I vaguely remembered, that JDM H22′s have a slightly different ignition system vs. US H22 engines and that this may be the reason for his ignition issues – using a JDM P13 ECU  with a U.S. prelude ignition system.

All JDM Preludes run an internal coil (inside the distributor simliar to civic/integra distributors).

All U.S. 92-01 Preludes run an external coil, as well as all US 90-97 Accords.

Because he was using a JDM P13 with an external coil ignition system, the ECU is throwing a fit because it’s looking for an internal coil that is not there.

Upon Googling to refresh my memory, I found this thread on preludeonline.com:

http://www.preludeonline.com/3015632-post5.html

Popularity: 11% [?]