Alright, I'm starting to get annoyed...
How can there be a million joes with Honda/acuras and only one of them has had the same problem as me??? WTF?

I got a misfire under boost, and the tach jumps wildly...
Just had one guy say it was DEFinitely the coil, saying the stock honds coils will break down when they get hot, yet another guy who said he had an MSD blaster external coil and it was misfiring/jumping tach and he fixed it by REMOVING the MSD coil and using the original, stock Honda coil???
Doesn't anyone else have/had this problem??
I find it hard to believe that I have 2 civics (93's) one boosted b16 and another all stock, and I have had the same problem in both, yet noone else seems to have this problem?? I'm starting to get
I was going to get an MSD coil, but now I don't know what to do...
I just spent $100+ on battery, new cap, new rotor, new battery wires and still have the same problem, I don't wanna keep dumping money on stuff that isn't the cause of the problem...

ANYONE ELSE HAVE THIS PROBLEM???

 

I had that problem before on a Si I owned and turned out to be a bad spark plug wire. Problem is, when it is electrical, it is hard to track down exactly what it is. I don't want to tell you that is what it is, because I can't say for sure.

 

check the spark plugs and wires. look carefully around the wires while the car is on to see if any wires have a hole in them. You'll hear a slight clicking as electricity reaches from the wire and hits something else. I had this happen to me once, but I dunno if this is what your deal is. The CE light would be on if the wires or plugs were becoming a relevant problem.

 

Yeah,
I changed the spark plug wires to a practically new set of Nology Hot wires, and I even tried a set of crappy bosch plugs (for a saab) to see if it was the plugs, same problem...
I'm thinking it has something to do with the coil becoming hot and it's resistance increasing, giving a smaller spark, cause it only happens when the engine is hot (Normal operating temp). I guess I gotta get a new one and see
Thanks for the input, keep the responses coming...

 

OK, thanks for the help, I got an update
I got a brand new Honda ignition coil, and replaced it last night, and guess what??
I stil have the misfire problem :mad :mad

Now, I don't know what it could be, although it might be my fuel pump.
My main question is, if the fuel pump is old, and "tired" could it not be flowing enough fuel to keep the fuel rail pressurized?
Because the fuel pump has not primed when turned on, for a couple of times lately, then it will finally work after like 10 key turns...
Would not enough fuel cause the tach to wildly fly toward redline?
This is my only other idea??
I have my NGK wires on now, I had them for like 5 years, I did change the wires to a set of Nology hot wires, but they didn't help the problem, so I took em off ( I don't like them much)
I mean it COULD be the wires, but I already replaced and troubleshooted them so I'm clueless...
Any help???

 

ICM/Ignitor
Fuel pump/main relay

If your fuel pump hasn't primed a few times when the key is turned to the "ON" position, check your main relay or the fuel pump itself.

 

Ok,
This is what I was able to get done this weekend...
I replaced the coil with a new Honda piece, and it still misfired...
So, I did the following
-replaced ignitor/ICM with one from my 93 EX stocker, still same problem
-replaced main relay with new one from EX stocker (we got a new one like 3 months ago) still same problem
-checked, and resoldered all wires in engine bay, still same problem
-while engine was running pulled, twisted and moved wires (engine bay, at ecu) to see if there was a bad connection, no bad connection, still misfires
-burned like 5 different base maps with both Crome and Uberdata, and this is where it gets funny...
-with my original uberdata tune (from guy that tuned it), the tach will jump only at like part-full throttle, or when in boost. If I keep it floored to redline, it sometimes rips, and other times, it feels as though it's not getting enough fuel, or maybe the timing is being retarded, again the tach will jump if it does this...
-With my Crome base map tune, it seems to make the tach jump even more, say it's idling, then I rev it up a little, the tach will jump like 1000rpms then go back down... Also with this tune, even at like part throttle or just cruising, it seems to make the tach jump alot more, but it doesn't noticably effect the engine....
With both tunes, tach NEVER jumps around on off-throttle...
So, if the tune affects the tach jumping, could it really be that it's not getting enough fuel?

I am running DSM 450's with an old accord resistor box, the connections seem good, I moved them around and no misfire, but on *onda-tech.com, someone had a misfire problem that they figured out had to do with something with the resistor box, guy apparently ran a wire from injector grounds to the ?nomex plug? (where is nomex plug exactly?) to the ECU or something and it fixed his problem... Anyone ever hear dof this?
Also, some guy on Honda-tech said he had same problem, it was fuel filter, was clogged, put in a new filter, and it fixed his miss with jumping tach...

But the funny thing is it really doesn't start to happen until it's hot, so how would the fuel pump or filter "know" when the car is hot, in order to start misfiring...

P.S. I checked my wires too, no visible cracking or arcing, and the resistance checks ok, max of 6k ohms for the longest wire, spec max is 25k ohms, so I know the wires are good, besides I tried the nology's, and same problem.
Help Me!!

 

That's odd. The fuel filter definitely could be the culprit. It could also be an ECU problem.

 

Well I'm totally stumped, my bro just replaced my fuel filter and guess what??
It still has the same problem

So, let's see I've now replaced
-spark plugs
-wires
-battery
-cap
-rotor
-ingition coil
-Ignition control module
-fuel filter
-battery cables
-re-wired my gauges
-checked all vacuum hoses and connections
-used fuel treatment
-rechecked and resoldered wires in engine bay and @ ECU
-and even burned different rom maps

All of this SH*& and I still can't figure it out

Thanks for all of the help guys...
anyone think of something else?

 

I'd swap in a known good ECU and see if the problem persists.