First of all Ive done and read the missfire threads on here.
My Stagea has started to missfire between 3000 and 4500 . The amount seems to vary although its always there and sometimes quite bad
After 4500 its fine although Ive not gone near peak revs just in case. Seems electrical to me but I could be wrong.
For those that dont know it has a rb26 engine with 2860-5s, 34 tomei cams with a new 34 CAS . Runs Fcon V pro gold without AFMs . Boost controller is Profec B
Engine was rebuilt about 2000 miles agoand was built , set up and mapped by tweenierob .
This was checked by Abbey recently when they sorted the AWD system .
It was also taken for an MOT and whilst testing the fuel guage statred to drop slightly in pressure on higher revs
So the map was checked and the fuelling was fine At that time the car was running spot on and nothing was touched only checked, It was also dynod at 504 at the hubs ( no dynapac comments please SS
) so the whole map was fine then
500-1000 miles later its started to misssfire.
However I am sure its something new and not related to anything previous and its had nothing done to the car engine related recently.
I also have a 32GTR (which doesnt missfire) so have swopped
In every combination.
Have changed the plugs NGK iridium 8 s (even tried 6s and 7s) All plugs show pretty much a perfect colour even when removed just after stopping with a missfire.
Also have swopped pretty much every sensor thats possible and checked all electrical connectors . I am sure the earths are fine as it has a custom earthing kit fitted.
Changed all the small bore boost pipes and checked all the intercooler, induction pipes also have taken the boost controller and the boost gauge out of the system - no change
Also done a compression test which was fine.
My only thoughts are cas connector(checked) or suspect loom