I have a p28ecu with Hondata 2b. Vtec is not working properly. It will randomly work when I start the car sometimes, then it will just stop kicking in.

Sometimes it works, and sometimes it doesnt. It is weird.

I have checked:

Oil level is perfect
Normal operating tempature
Vtec valve works when 12V are sent to it

So what else can I check for? It works very speratically. I am stumped. Any Ideas are greatly appreciated.

 

Try resetting the Hondata. To do this hold the button in and turn the key to the on position and hold it for a few seconds, then turn it back off. See if that resets the interface box. Did you have to run any additional wires for VTEC in this car?

 

Which button do I hold? Is it on the blue box? Because I have no other buttons for hondata.