300Tdi Discovery
V8i
5
FAULT DIAGNOSIS
Engine backfires into inlet system
1. Is the Distributor, HT connections and routing
correct?
NO -
See ELECTRICAL, Repair, Distributor
- V8i
YES - Continue.
2. Is air fuel ratio correct?
NO -
Check multiport fuel injection.
See
Electrical Trouble Shooting Manual.
Check brake vacuum connections.
See
BRAKES, Description and operation, Brake
Servo Unit
Check heater/ventilation unit vacuum
connections.
See HEATING AND
VENTILATION, Description and operation,
Heating and Ventilation Unit
Check the crank case and fuel tank ventilation
system.
See EMISSION CONTROL,
Description and operation, Emission Control
YES - Continue.
3. Are cylinder compressions satisfactory?
NO -
Carry out compression test to check for
leaking gaskets valves etc.
See
Cylinder Compression - Test
For repair
See Repair, Cylinder Heads -
Renew
If problem is not diagnosed: repeat tests starting
at 1.
