Hi all, I have a 94 accord lx w/ an f23 swap. Im running the f22b1 wiring harness and f22b2 ECU. The engine has maybe 60k miles on it and only 40k when I swaped it in. Ive slowly had some backfiring issues that have gotten worse over the course of 3 weeks or so. When it hits VTEC its backfiring, sometimes its a lot sometimes not. I was thinking it was a VTEC valve promblem but everything seams fine when I check it. I was wondering if anyone had any idea to what it might be. Much appreciated.

 

Firing in the intake? Hmm. Have you checked ignition timing? Plug wires in correct firing order? Ive seen ignition rotors melt and twist inside the dizzy. Check the valve adjustment too. Good luck.

 

Did you ever figure your issue out? If not, swap your ECU for the f22b1. There is no way you are hitting VTEC with a non VTEC ECU.

 

How the hell are you hitting VTEC with a Non-VTEC ecu? LOL! thats great.

Regarding your "VTEC Valve Problem," I think you need to research how VTEC works instead of guessing. VTEC is a second set of aggressive profiled lobes on your camshaft that can be activated when the the ECU tells the VTEC solenoid to activate. When this happens a mechanism lifts which makes the more aggressively profiled lobes control the valves. When VTEC is deactivated, the mechanism goes back down and the low performance lobes on the camshaft are utilized to save gas. Therefore, there are no seperate set of valves for VTEC.


Anyway, with that said..

this "backfiring" noise.. does it sound like loud popping and the RPMs not being able to go farther?

If so, your ecu finally decided to operate in closed loop mode because it decided that something isnt right on your motor.. It could very well be that you are using the wrong ecu but I am not sure. You should take a video next time it happens.

 

I resolved the issue, bad dizzy cap. And for the ECU, the f22b1 IS the VTEC version of this engine, the f22b2 is not