So I bought an EJ1 with a B16B running on a chipped P28 and I tried to run my VAFC on it. I am not a ecu smart guy or even a tuner at all, but I have the jumper harness that plugs right in. I plugged it in and basically I lost my VTEC all together and got a check engine light for my speed sensor. I replaced the speed sensor and tried again with the same result. I don't know exactly what the chip is running but why would the speed sensor fail horribly while not allowing the VAFC to monitor any data? Any help would be appreciated

 

Why are you even attempting to use the VAFC? Ditch it and get the car tuned properly since you already have the chipped ECU. Save yourself some time and money.

 

okay I understand to get the car tuned and I have already decided that....I guess you over analyzed the question. Why would the ecu reject the VAFC and make my speed sensor fail?

Disclaimer: I AM NOT GOING TO PLUG THE VAFC INTO MY CAR ANYMORE,AND I AM GOING TO GET RID OF IT, I AM JUST TRYING TO FIND OUT WHY MY ECU WOULD REJECT THE VAFC.

 

I'd only be able to venture a guess, but I'd say wiring. The VAFC is probably screwing with the signal and popping the code.

 

right so here is my dilemma....I figured it could be the wiring myself so I pulled the harness off immediately when i got the check engine light and swapped out my speed sensor once I got back to the shop. With no harness and no VAFC, just ecu running I made good power and got my crossover back.... So my tuner tried it again and again no VTEC but the speed sensor did not go out this time. We thought maybe because the crossover point was set differently that would be the disconnect, so we set it at 5600 rpm to match the regular crossover and still no crossover. Well I don't know that is why I am asking...