posting for a friend of mine:


92 hatch with 93 gsr b17a swap, recently swapped in a new b18c5 longblock, using everything else from the b17a (ecu, cams, harness, intake manifold, everything), so basically everything is exactly the same as when it came out, except for the new longblock. Everything was working fine before the swap, and it was also running great after the swap. Then, the car misfired a little one day at heavy throttle at about 3000rpm and the tach needle jumped a bit. The two days following, the misfiring got progressively worse (anything over 25% throttle) almost to the point that you couldn't drive the car. The tach needle would fly around erratically during misfires or even when it wasn't missing. However, on the vafc tach function it was getting a steady reading.

I replaced the cap, rotor, ignitor and coil with all new parts, and the plugs and wires are both new. It seemed to have helped a bit, so it at least drives smoothly under 25% throttle, but it still misfires really bad over 25% throttle, and the tach is still very erratic. I haven't gotten into any fuel system stuff yet, thinking that the erratic tach points to something ignition related.

all plugs look fine (ngk-R not platinum), di-electric grease on all plug connections....
bad injector perhaps?

 

check your coil and your ignition module, my module went on me, and it did the same thing your car is doing right now, good luck

 

the ignition module (igniter) is brand new..

 

Ignitors can look new and still be no good. You sould also check the tightness of the conectors on it, we had a car once that was doing the same thing and it was just loose wires. Speaking of wires, check to make sure none are backwards, that would also cause problems.

Deetz

 

im sorry... the ignitor as well as the rest of the ignition stuff listed is *brand new, i bought it from honda. the car is acting the same as it was before. i was sure the problem was the ignitor, but after replacing everything the problem persisted. i will be replacing all of the wires in the distributor soon, but im just wondering if anyone else has any other things i could check. i tightened all of the crimp connectors and dielectric greased them as well

tia

 

You should solder the "crimp connectors"
If that doesn't work see if you can borrow a known good distributor from a friend. It could be something inside the distributor other than the coil or ignitor.