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DPF & Diesel

Injector Diagnostics & Injector-Related Repairs

Injector faults imitate a lot of other problems. Testing the injector data before replacing anything avoids fitting expensive parts the engine did not need.

Rough running or smoking?

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Symptoms associated with injector faults

  • Diesel knock or a distinct ticking from one cylinder
  • Misfire, rough idle or vibration
  • Poor starting, particularly when hot
  • Black, white or blue smoke
  • Loss of power and increased fuel consumption
  • Fuel smell or leaks around the injector
  • Repeated DPF loading caused by poor combustion

What we check

  • Injector correction and balance values in live data
  • Fuel rail pressure and regulation
  • Leak-off and return testing where applicable
  • Cylinder contribution and compression
  • Wiring, connectors and driver circuits

Repair work

Depending on the diagnosis this can mean injector removal and replacement, seal and washer renewal, correcting a fuel supply fault or addressing seized injectors. Where an injector has been in place a long time, removal can be involved — we will tell you that up front rather than after the event.

Frequently asked questions

Diesel running badly?

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Our work

Recent jobs from our workshop

Photographs taken during work carried out at our Iver workshop.

  • Inlet port in a cylinder head heavily coated in carbon

    Carbon-choked inlet port found during diagnosis

Symptoms

Symptoms that often lead to this repair

Look up what your car is doing and read what it commonly means.

Glow plug (coil) light flashing on a dieselOn many diesels the coil symbol doubles as an engine fault warning. A flashing light usually means a stored fault, not necessarily a glow plug.Read more White smoke from the exhaustColour, smell and whether the smoke clears once warm are what separate normal condensation from a coolant or fuelling problem.Read more Black smoke from a diesel exhaustBlack smoke is unburnt fuel. On a modern diesel with a DPF it usually also means extra soot heading into the filter.Read more Car hard to start when coldCold starting depends on battery condition, fuel pressure, compression and, on diesels, glow plug operation. Cold weather exposes weakness in any of them.Read more Engine misfire: symptoms and common causesA misfire means a cylinder is not contributing properly. It is either fuel, spark or compression on that cylinder — and identifying which comes before parts.Read more Smell of petrol in or around the carFuel vapour is a fire risk, so a petrol smell is one of the few symptoms worth acting on the same day.Read more Car jerking when acceleratingJerking under load usually means the engine is briefly not getting the fuel, air or spark it needs — live data while driving is the quickest route to the cause.Read more

Related

You may also need

Diesel DiagnosticsModern diesels combine high-pressure fuelling, turbocharging, exhaust gas recirculation and after-treatment. When one part of that system drifts, the symptoms usually show up somewhere else.Read more DPF DiagnosticsA DPF warning is the end of a chain of events, not the start. Finding out why the filter is loading up is the part that saves money.Read more EGR Valve Repair & ReplacementThe EGR system recirculates a measured amount of exhaust gas back into the engine. When it sticks, everything downstream suffers — including the DPF.Read more Engine DiagnosticsEngine faults are usually a chain of events rather than a single broken part. We test fuelling, ignition, air, compression and control signals to find where the chain breaks.Read more

Talk to us about injector diagnostics & injector-related repairs

Based in Iver, covering West London, Berkshire and South Buckinghamshire. Send your registration and we will quote for your vehicle.

Call 07440 140340WhatsApp us