Vauxhall Signum Z19DTH Injectors

Vauxhall Signum Z19DTH Overview

The Vauxhall Signum with the Z19DTH Fiat / Opel 1.9 JTD / CDTi 150hp engine was produced between 2004 and 2008. This vehicle uses Bosch common rail diesel injectors (primary part number 0445110391) operating at fuel pressures up to 2000 bar. The Z19DTH engine in the Vauxhall Signum produces and of torque. When replacing injectors on the Vauxhall Signum Z19DTH, always use new copper sealing washers and torque to manufacturer specifications. Each injector should be coded to the ECU after fitting.

Compatible Injectors

Common Injector Problems in Vauxhall Signum

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  Rough idle and engine vibration — Worn injector nozzles cause uneven fuel spray, leading to rough idle at low RPM. Most noticeable when the engine is cold.
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  Excessive exhaust smoke — Black or blue-grey smoke on acceleration indicates poor fuel atomisation. This is often caused by carbon buildup on the injector nozzle tip.
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  Poor fuel economy — A worn or leaking injector delivers incorrect fuel quantities, reducing efficiency by 10–20% in severe cases.
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  Engine misfire under load — Intermittent misfires during acceleration suggest one or more injectors are failing to deliver the correct fuel pressure.
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  Difficult cold starting — Degraded injector nozzles struggle to atomise fuel at lower cranking pressures, causing extended crank times in cold weather.

Other Engine Codes for Vauxhall Signum

Other Z19DTH Vehicles

Related Pages

Bosch Fiat / Opel 1.9 JTD / CDTi 150hp — browse compatible engines, vehicles, and injectors