i have a 92 ex sedan, w/ msd, intake, high flow cat, and 2.5" exhaust. when my vtec engages around 5000 rpm, by car sputters, and back fires real bad, and the tach bounces real fast from like 3-6k, its really starting to scare me so i dont even rev above 4500, any suggestions??? could this possibly be a bad vtec solenoid?

 

does it rev slower after you hit your vtec engagement point?
what motor is this on?

 

um ya i guess it revs slower, but the backfiring really scares me so i dont really know, on a d16z6

 

my z6 use to backfire all the time. scared me til my friends did the same so i just thought it was normal

 

my sol did the same thing with msd 6al. do you still have the stock coil?? if so close the gaps up on the plugs a little, made my pop'n go away.

 

you could an air leak in one of the injector. just a thought.

 

no stock ignition compents anymore, on gap in the plug do you mean the sparkplug???

 

yea i meant thepark plugs, helped mine alot, but i still got my stock coil

 

what are the pros /cons of stock vs msd coil?? whats the diff???

 

the stock coil seems to not keep up with the demands the 6al makes. i'm planing on upgrade'n next week, don't want to take the chance of the stock coil just giving up and leave'n me on the side of the road.

 

i jes researched a lot and i think my spark plug gap is too big, like .40 if i remember right, now i think thats my prob

 

when i had nitrous on my car, i had to run .35, but with boost i had to go back to .30

 

got MSD 6AL with blaster 2 coil, msd wires, and ngk plugs gapped at .030. sometimes i still get backfire as well. seems like an air/fuel problem in my case. maybe yours too.