hey i have a 91 civic si with a b16a swap and i have developed a miss and it seems be getting worse, also i have noticed that about 100 miles after putting new platinum 4 spark plugs it the were almost fouled already, another thing is my tach will jump like 2-3k rpms and then at high rpms it will ever go past 5.5k and it will jump to like 7k every other second but my engine still is revving im so confused, i replaced the coil, cap, rotor, control module, and wires still gettin worse HELP! PLEASE - Zach

 

have you checked timing?

 

Check the distributor rotor make sure it all the way on and the screw is on and tightened up.

 

the rotors only go on one way and only go so far till the screw lines, as for timing are u talking bout ignition timing? if so i dont know how that could be off cuz the distributor only go in one way thanks zach

 

how did this occur, tell me some history on the motor, or did you just buy the car and you are walking into the door not knowing a thing just like me. has the timing belt been changed, or has it really needed it?? if it hasnt been changed, it may have jumped a tooth, it will cause it to idle very roughly and miss when under acceleration. when i said is the timing off, i meant the belt its self sorry for the confusion. let me know.
steven

 

its probably those plugs honestly.. I've seen cel's just from those plugs

 

thanks man i will check my timing tomorrow night, yes i did buy the car with this motor in but i am good friends with the kid that had it (he got a promotion to manager at his work so he bought an rx8) and i bought his hatch. this problem occured after i bought the car, it started out as a miss i could live with, and now its horrible. i change the plugs and it goes away for about 10 mins and then it starts again????????? so yea im pretty lost, i geuss im obviously not getting good enough spark so i am gonna get a new distributor, thanks zach

 

also it only does in first gear from 2 to about 4 grand or so and then only does in other gears when i am cruising at a constant rpm/speed thanks

 

sorry for some many replies but im trying to explain it the best i can......also it only does it when it the car is warmed up, meaning when the car is cold it wont do it thanks

 

did the tach only do this jumpy thing since the miss-fire? and is it a propper vtec dash?