Toyota HiAce: 1KD-FTV Injector Tip Erosion Causing Rough Fuelling

The 1KD-FTV common-rail injectors are susceptible to nozzle tip erosion from cavitation and particulate contamination in the fuel at high odometer readings, typically manifesting after 150,000 km in fleet service. Tip erosion produces a distorted spray pattern — from the designed narrow cone to a wide, imprecise fan — causing poor atomisation, incomplete combustion, increased smoke, and rough or misfire-like running especially at idle and low load. Fuel consumption rises noticeably. Continued operation accelerates cylinder wash-down and glazing. Diesel injection specialists can measure back-leak rate and spray pattern on a flow bench to confirm erosion before condemning injectors. Replacement injectors require coding to the ECU on post-2010 models.

• Rough or uneven idle with occasional misfires
• Increased fuel consumption without change in usage pattern
• Excessive black smoke from exhaust under load
• Hard cold-start with extended cranking
• Cylinder-specific misfire codes (P0261-P0270 range)

1. 1

   Request injector back-leak measurements — excessive return flow confirms tip or seat wear.

2. 2

   Inspect the fuel filter condition and bowl for particulate contamination that accelerates injector erosion.

3. 3

   Check for evidence of water contamination in the fuel system.

4. 4

   If a workshop inspection is possible: Connect a diesel diagnostic scanner and check per-injector contribution and fuel trim corrections.

Parts involved: Fuel injector.

$1,800 to $4,200 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Have the injectors ever been tested, serviced, or replaced, and at what km?”
• “What brand and quality of diesel fuel is routinely used?”
• “Has the fuel filter been replaced on schedule and was any contamination found?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.