Diesel Engine Diagnostics

Expert Fault-Finding and Repair Solutions for All Diesel Vehicles

At Diesel & Turbocharger Services (DTS), we specialise in diesel diagnostics – identifying and resolving engine performance issues, fuel system faults, and hard-to-trace problems in diesel-powered vehicles. Based in New Plymouth, we service all makes and models, from utes and 4WDs to vans and light commercial vehicles. Our team combines extensive mechanical expertise with advanced diagnostic equipment to provide accurate, efficient fault detection. Whether your diesel vehicle is smoking, struggling to start, losing power, or just not running as it should — we’ll find the issue and fix it right.

What Our Diesel Diagnostics Service Includes

Our technicians work methodically and transparently — explaining each fault, your options, and estimated costs before proceeding with any repairs. Our standard diesel diagnostics service includes:

Computerised fault code scanning.

      Injector testing and evaluation.

Glow plug and solenoid testing.

Turbocharger pressure and performance tests.

Injection pump inspection and timing analysis.

Fuel line pressure and return flow testing.

Filter checks and fuel quality assessment.

Why Diesel Diagnostics Matter

Diesel engines rely on high-precision fuel delivery and tight tolerances to operate efficiently. Even minor issues can result in poor fuel economy, high emissions, and long-term engine damage. That’s why early and accurate diagnosis is essential. Our diesel diagnostics service helps identify faults in:

  • Fuel injection systems
  • Glow plug systems
  • Turbochargers
  • Solenoids and sensors
  • Pump timing and fuel delivery
  • Starting and idling performance

Whether your check engine light is on or you’re noticing subtle changes in how your vehicle drives, it pays to have your diesel system tested by professionals.

Diesel Diagnostics FAQ

  • How do I know if my diesel engine needs diagnostics?

    Common warning signs include smoke from the exhaust, hard starting, rough idling, loss of power, or the check engine light illuminating. If your vehicle isn’t running as smoothly as usual, a diagnostics test can identify the issue early — saving you money and preventing further damage.

  • Can you diagnose turbo problems?

    Yes. Turbocharger issues can affect engine performance, boost levels, and fuel economy. We check for pressure loss, wear, or internal leaks using specialised tools and road testing. We also assess related systems like air filters, boost sensors, and vacuum lines.

  • How long does a diesel diagnostic take?

    A full diagnostic generally takes between 1 and 2 hours, depending on the complexity of the fault. We aim to provide same-day answers, with transparent reporting and repair recommendations.

  • Do you test fuel injectors and pumps?

    Absolutely. We can bench test injectors, evaluate spray patterns, and check opening pressure. We also inspect and calibrate injection pumps, including timing, pressure control, and housing integrity.

  • What should I do if my diesel smokes at startup?

    White smoke that clears after warm-up is often related to glow plug faults, timing, or air in fuel. It’s not normal and should be inspected. Ongoing smoke can cause increased emissions and engine deposits.

  • Is it safe to drive with diesel engine problems?

    While the car might run, ignoring diesel faults can result in higher repair costs, reduced performance, and engine damage. If you're experiencing any symptoms, it's best to have a full diagnostic done as soon as possible.

Book Your Diesel Diagnostics Today

Whether your diesel vehicle is showing signs of trouble or you just want peace of mind, Diesel & Turbocharger Services is here to help. Contact us today to book expert diesel diagnostics in New Plymouth and surrounding areas.