Hi, i have a civic vti, (b16a2) .
After the vtec opens the cars stalls, its like before vtec the cars more faster.
You cant really feel it in the first gear , but 2nd, and espicially 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.

 

bump..............

 

bump..............

 

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.

 

does it feel like it is breaking up or just feels like it hits the rev limiter? Is it worse in some gears then others? If so check the gap on your plugs are you running any sort of FI?

 

no it doesnt feel like the rev limiter, it revs on until the 8300rpm, but reving just slows down, specially from 5500 to 7000 and then speeds up a bit from 7k to 8k.
the spark plug im using is orijinal one

by the way whats FI?

 

Force Induction like turbo, nitrous anything lik that if you don't have FI do this pull the plugs see if they look good make sure they are the right plug for the app. and check the gap to make sure its correct.

 

hi i dont have any fi, my car is NA, my engine is standard apart from exhaust and filter kit.
Ive re-checked my spark plug gap, its right, its 6 ( the gap)

 

dude i am having the same problem in my 97 gsr. 2nd gear cant feel vtec at all, but 3rd on up the car is fine until hits vtec aroud 5700 or so and then around 6500 it feels like the engine bogs. Almost as if its overrevving. I just replaced the spark plugs a couple weeks ago and gapping is correct. distributor maybe???

 

check your oil pressure. mine was low which was causing the vtec not to hit

 

ok i connected a wideband, when the car slows down it over fueled, so its too rich i mean really really rich, and around 7000 the air ratio goes to arond 12. , so the problem is over fueling, but why ?
ive some parts with my friends car.
-o2 sensor
-regulator
-enjectors
-inlet temp sensor
-map sensor

anything left connected with the fueling?

Could there be a problem with the ecu? we changed the ecu's too, but they would start with different ecus.
so i still need help...

 

bump....

 

i could be wrong but..did u check ur timing?

 

dude. my boy had a similar problem. it was his dist/rotor. it was loose so when it had to speed up it would wobble making it missing/ hessitation. u might want to check that.

 

the timing is ok, dist. etc . firing is ok too, everything looks normal i just can find the problem, i had my piggyback ready, i put that and reduced the fuel from their, but im still wondering what the problem is

 

got a similar problem with an h22 it just stops pulling around 5k and wont turn past 7k checked everything i can think of