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5B
Chapter 5 Part B:
Ignition system
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
Distributor (breakerless ignition systems) - removal and refitting . . . 4
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ignition amplifier (breakerless ignition systems) - removal and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Ignition HT coil - removal, testing and refitting . . . . . . . . . . . . . . . . . 3
Ignition module (static distributorless ignition systems) - removal and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Ignition system - testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ignition system check . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Ignition timing - checking and adjustment . . . . . . . . . . . . . . . . . . . . 8
Spark plug renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
TDC sensor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Timing plate (breakerless ignition systems) - adjustment . . . . . . . . . 7
5B•1
Specifications
Contents
Easy, suitable for
novice with little
experience
Fairly easy, suitable
for beginner with
some experience
Fairly difficult,
suitable for competent
DIY mechanic
Difficult, suitable for
experienced DIY
mechanic
Very difficult,
suitable for expert DIY
or professional
Degrees of difficulty
5
4
3
2
1