The system 2 wherein {TAIL ~ said intake manifold temperature} is varied in discrete steps corresponding to idle, {HEAD ~ part open throttle}, and wide open throttle operation 
The system 2 wherein { TAIL ~ said intake manifold temperature } is varied in discrete steps corresponding to idle , { HEAD ~ part open throttle } , and wide open throttle operation
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH