hi guys, my mate bought a 3 door cosworth a few weeks back with a new engine waiting to be fitted.engine spec(low comp 7.5 to 1, ported head,bd 14 cams,t4 turbo greys)i got in in and running with no problems but when you start to lift the revs towards 2k-3k it appears to have a flat spot and the engine starts to misfire.
so far i have changed plugs,leads,rotor arm,dizzy cap,water temp sensor,air temp sensor,crank sensor,phase sensor x2,ecu and fuel pressure regulator.
i got it running on a standard map sensor and level 6 ecu with a stage 2 chip on yellow injectors(fleshy cleaned).my mate is now on the verge of slitting his wrists and i dont think i can cope with a suicide on my hands
any ideas chaps?


john

 

stage 2 chip is surely for light green injectors?what boost u running?

 

the stage 2 chip is of another mates cars running yellows.
not running any boost yet,cant get the car to rev cleanly to drive the thing out the garage.

 

have u got the phase sensor and crankshaft sensor connectors the wrong way round?pretty sure these fit each other?although think this would cos a non-start problem but might be worth a check?sure someone else will confirm this

 

starts fine,ticks over okay,soon as you try to lift the revs it goes into a flatspot and then starts to miss,keep lifting the throttle and it will clear

 

no air leaks anywhere no splits etc on any of the vacuum hoses?timing all ok ?dizzy shaft ok no play in it etc??

 

timing spot on,dizzy 99% spot on(used worse before)air leaks next check on the list,borrowing another map sensor today.
thanks for the input,i will keep you updated.
john

 

the car is now running sweet,but cannot run the car with the idle valve connected.