System type
All engines except XU5M2/Z, XU5M3/Z, XU5M3/L and TU1M/L . . . . . . Electronic breakerless ignition system XU5M2/Z, XU5M3/Z, XU5M3/L and TU1M/L engines . . . . . . . . . . . . . . Static distributorless ignition system Distributor
Rotor arm rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-clockwise Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 3 - 4 - 2 (No 1 cylinder at flywheel end of engine)
Ignition timing (vacuum hose disconnected) XV8 and XW7 engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6° BTDC at 650 rpm XY7 engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8°BTDC at 650 rpm XY8 engines:
Early models with M152E advance curve . . . . . . . . . . . . . . . . . . . . . . 0° BTDC at 950 rpm
Later models with M159E advance curve . . . . . . . . . . . . . . . . . . . . . . 8° BTDC at 850 to 950 rpm XU5J engines (up to VIN 5520364) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30° BTDC at 3500 rpm or 6° BTDC at 700 rpm XU5J engines (from VIN 5520364) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10° BTDC at 850 ± 50 rpm XU5JA and XU5JA/K engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10° BTDC at 900 rpm XU51C and XU51C/K engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10° BTDC at 750 rpm XU5M2/Z, XU5M3/Z and XU5M3/L engines . . . . . . . . . . . . . . . . . . . . . Not adjustable, controlled by MMFD Mono-point G5/6 engine management system
XU9JA and XU9JA/K engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5° BTDC at 700 rpm XU9JA/Z and XU9JA/L engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Not adjustable, controlled by Motronic M1.3 engine management system
XU9J1/Z and XU9J1/L engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10° BTDC at 900 rpm TU series engines (except TU1M/L) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8° BTDC at idling speed (see Chapter 4) TU1M/L engines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Not adjustable, controlled by MMFD Mono-point G6 engine management system
Ignition coil
Ignition HT coil resistances:* Electronic breakerless ignition systems: Primary windings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 ohms
Secondary windings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 K ohms
Static distributorless ignition systems: Primary windings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 to 0.8 ohms Secondary windings - Bosch coil . . . . . . . . . . . . . . . . . . . . . . . . . . 14.6 K ohms
Secondary windings - Valeo coil . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.6 K ohms
*The above results are approximate values and are accurate only when the coil is at 20°C. See text for further information Spark plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Chapter 1 Specifications