Hello
I have a jdm h22a ob1 swap on a 95 accord coupe, runs great and smooth on chipped p28 ecu, recently I went back to stock jdm p13 ecu recently for fuel economy, but noticed that idle gets funny when I drive the car (engine gets warm), also the acceleration suffers after the idle problem, it gets sluggish throughout the whole power band, vtec does engage, as mentioned before these problems were not there while on the chipped p28, there are no CELS as well, any idea what I could be? Ive researched the forum and got no straight answer.. thanks

 

Do you have everything hooked up? Egr? Knock sensor? iabs?

 

yup, therefore there is no check engine light, and it does work

 

Was the P28 actually tuned? If so i would ask the tuner what was changed from a stock map.

If the CEL light does work, and you get no lights, I am sort of stumped, but I have seen an ecu where for some reason the CEL light did not work at all, so it had codes but would not show them. In particular a coolant temp sensor, so it ran like crap once warmed up.