Alright, I have a b18c fully built bottem end with a b16a head, and a t3/4E turbo. I'm running the orginial Integra LS wiring harness modified to work with a vtec motor. Also using a the Skunk2 OBD2 to 1 covertion harness all of which leads to a OBD 1 ECU with stage 2 hondata. But the car is missing in Vtec, It makes good power to up the vtec change over but then not longer makes good power gains after that. I have already replaced the MSD coil, control box, spark plugs, spark plug wires, and a full distributor. The full air mix and the ecu program are perfect and the ecu runs in other cars. Any ideas?
Miss firing in Vtec
- Thread starter TurboIntegra
- Start date
or scratch the motor, email me, ill give you mah addy, and you can send me the motor, nothing beats starting over lol
i wonder if your cams are okay............ which ones are you using and what condition are they in?
misfiring only in vtec would suggest that your tuning is off........ maybe the program advances your timing too far, or your fuel curve is f**ked somewhere.........
misfiring only in vtec would suggest that your tuning is off........ maybe the program advances your timing too far, or your fuel curve is f**ked somewhere.........
I was thinking the same thing. If it's only doing it in vtec, I was thinking about your cam lobes, or the fuel mixture the comp is sending. Timing would be another issue because of the compression ratio and nature of the LS/VTEC. they can be very finiky cuz they werent really designed to be stuck together.
Using the stock B16A cams, but the compression ratio was dropped to 9 to 1 with the rebuild of the GSR block. Sorry forgot to put that part in the original post. But we looked over the past dyno runs before the motor was rebuild and it was missing then also, just didn't noticed it.
if its not your a/f ratio, its the timing, you probably have it advanced too far. kick it back a few degrees, and it should reduce the problem. the reason its making such good power before it begins to miss is the advanced timing.