Backfiring
Backfiring on a non-modified Rb30 can be caused by the following factors:
A faulty Exhaust Gas Recirculation (EGR) system.
Incorrect Timing.
Thermostatic air cleaner system.
Vacuum leak.
Split, holed or faulty vacuum advance diaphragm.
Damaged valve spring or sticking valve.
Intake air leak.
Carby float level incorrect.
Cracked distributor cap.
Faulty distributor rotor.
Tracking between contacts in the distributor cap.
Faulty high tension leads.
Faulty spark plugs.
Leaking exhaust manifold gasket or manifold to engine pipe gasket.
Dirt caught in the needle and seat.
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