Engine shuts off cyl 1. Can only talk to engine on obd. There is only limited info. Have not got access to a wiring diagram or any other values such as injection duration, air mass etc. Have replaced sparkplugs for the correct iridium plugs & 1 new coil pack. Have noticed that the engine runs noticeably better with the airmass disconnected. have back probed all the pins at the air mass & none of them are sending a signal voltage of anything like 0.8- 1.0volts as I would expect to see. At idle we are getting 6.7 g/s? Would like to scope injectors but injectors are not accesible unless manifold is removed. Could back probe connector but don't have an idea of the colour codes for injector wires for cyl 1. Any help with data or wiring diagram or tips will be a great help. Thank you.