JCB Poor Cold Combustion / Fuel Atomization Issue

White smoke from exhaust and rough running, particularly on cold start.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low compression in one or more cylinders, Faulty injectors, Incorrect injection timing, Water in fuel

Safety: Avoid prolonged operation with misfiring cylinders; unburnt fuel can damage the exhaust system.

Fuel quality: Drain water separators and check for water in fuel. Replace filters and refill with clean diesel.
Cold start aids: If fitted, check glow plugs or intake heaters for correct operation.
Injector test: Have injectors bench‑tested and replaced if spray patterns are poor.
Compression/timing: Low compression or incorrect timing requires specialist diagnosis and repair.

Professional Required 5/5

Fuel Injector Set

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