1997 Jaguar Vanden Plas no start

IGNITION SYSTEM
Ignition timing and spark distribution are controlled by ECM according to sensor inputs. Ignition timing is controlled primarily as a function of engine load and speed. Engine load is sensed by Mass Airflow (MAF) sensor. Engine speed is sensed by a Crankshaft Position (CKP) sensor. The ECM processes inputs from the sensors and accesses ignition timing from the ignition timing strategy. Individual ignition coils are located above each spark plug. ECM incorporates the primary circuit for each coil and provides switching for each primary circuit. The correct firing sequence and timing of the ignition coils is determined by ECM from cylinder synchronization input provided by the Camshaft Position (CMP) sensor.

Check/clean or replace CMP and CKP