Maybe someone here can help me out with this one.
I have had the B16a swapped in for about 8 months now and it has been acting up for the last month or so. When I am accelerating under light throttle, the car seems to have a lack of power but when I give it a little more throttle, it runs ok.
When the car is hesitating, my Autometer A/F guage goes into the stoich range but is still in the green (during acceleration). I have all of the orange and all of the green lit up at the same time.
At WOT, the meter reads full rich(just the last green LED is lit up) and life is great. So, at first, I thought I had a bad distributor cap..changed it. Did a MSD 6AL, cap, rotor, plugs, wires..still there.
Changed the fuel filter..still there.
Also, I have noticed that if I am keeping a constant speed, then give it a little bit of gas, my A/F guage quickly goes to lean before it jumps to rich...
The only things I haven't changed or checked yet are the injectors, pump, regulator...
I will be keeping a close eye on this post so please if you have any questions on what I have changed or checked feel free to ask...just please help me figure this one out!
Thanks
Jay

 

this mostly cause by fouled 02 sensor (or two in a EF).....

check your 02 sensor, take it off and clean it up with a brush (metal) and burn off the rest with a torch, till its red.....or get a new one....

 

I too thought it was the o2 sensor, so I swapped it out for a new NTK 4-wire sensor (I did not use the heater, just the signal wire and the ground).
The problem was still there.
I thought maybe the o2 sensor wasn't getting enough ground through my DC header which was giving a false reading.

 

I may be way off here, but I've heard a spun distributor bearing can cause the car to hesitate, miss, fart etc. like that. The fact that Honda distributor bearings aren't lubricated and they're located so close to the block, they heat up and break down easily.

 

Well the problem is gone for now.
I removed the NTK four wire sensor and replaced it with a stock Honda one wire sensor and the problem is gone.
However, I will definately get a new o2 sensor bung installed on my header and run two seperate sensors to the two inputs on the ECU.
If you guys didn't see Hondata's post check it out in CRX /Civic EF section under this same topic.
Thanks for the help everyone
I will keep you posted on the results
Jay