Hi, i have a civic vti, (b16a2) .
After the vtec opens the cars slows down, its like before vtec the cars more faster.
You cant really feel it in the first gear , but 2nd, and e****ially 3rd, the head just goes down when the vtec opens.
so after 5500 its really bad, but at 7000 and after is a bit more better.

Any suggestions what the problem could be.

 

one more thing, i had my knock sensor missing, so there was the engine check light on, but when i inserted the knock sensor, the engine check light went off, but would i still need to reset the ecu.

 

I would recet the ecu, cant hurt. As far as vtec, when did you strat having this prob, just know or always?

 

well i bought the car , and i had this problem, as it was even worst, there was the engine check light, so i realized that the knock sensor wasnt there, so i bought one, and put it in, the engine check light went off.
But i stiil have to problem.

 

dirty fuel injectors maybe?

 

I dont think this would have much to do with it, but what kind of oil do you use, or did the previous owner use? Was it the right weight?

 

i use 10-40 mobil oil,
dont what the previous owner used.

why do you think it could be because of the oil?

 

well, isnt it supposed to be more like 10w-30 and not 40? Oil pressure is what oppens the vtec so to speak. I suppose if the oil weight isnt right the vtec wouldn't engage properly, but I dont think this is the problem in your case.

 

i would say first thing, reset the ecu, then check the timing.

 

ive reset the ecu, and re-checked the timing but still have to same problem