I am having some issues with my car after a h22 swap. I am still running the stock ecu because the people I ordered the motor and tranny from have yet to ship me the ecu and I need the car to travel back and forth to work. Here's the problem. The car runa fine until it gets to operating temperature and then it starts to miss fire and the it throws a cel 43 do you guys thinks its do to the h23 non vtec ecu? Or is it possibly another problem? I wanna have everything ready so when the ecu gets here I can just plug it in and enjoy my vtec. Thanks in advance guys!

 

was the prelude automatique before?

 

need a little more info on the car....year, original engine....you say "stock ecu" do you just mean the h23 compared to h22? cuz both are "stock" just for different engines

 

code 43 is knock sensor... it takes about 5 minutes for the CEL to come on for this.. check your sensor and check the connector.

 

code 23 is knock sensor

43 should be fuel suply

to the OP let us know exactly what ecu is in the car please...also there is a list of codes in my DIY thread https://honda-tech.com/forums/honda-prelude-4/diy-diagnose-check-engine-lights-4th-gen-prelude-2495089/

 

o yeah my bad i got confused... sorry about the bad help bro.

 

i wouldnt doubt that using the wrong PCM is the problem. Youre just gonna have to live with it until the H22 PCM arrives.