got the car going and every now and again it drops to run on 1 rota there is power at both ternimals on the coils but no spark on both leads just on the rear rota it has new plugs and leads in it that are only a few hours old from starting it up and burning clean

checked every thing no errors comming up but when i did have the pink wire on the leading coil (hec 715) of the rear rota and it did it it would say rpm error and then it would clear its self for some reason and be fine

thought it was the injector at first but they are new and all working

 

Check the earth on your x4 box.
Its either not on your block or its loose or its a **** connection.

Or the ground in the car is crap. Or you have faulty spark plugs.

 

yep put some old plugs in it from the bat and it started mint and reved clean think ill get some 10 egv and take some more fuel out

cheers rx72c

 

wouldnt be the first time ive seen dud plugs.