2012 — 2026
2.5L I4 (QR25DE)
Petrol
Listen for a distinct rattling or metallic clatter on cold startup and under load. | Description: The QR25DE engine is prone to timing chain stretch; if heard, replacement is urgent to avoid catastrophic engine failure.
Check the smoothness of the automatic transmission shifts during low-speed acceleration. | Description: Early hesitation or 'hunting' for gears often indicates old ATF fluid or solenoid wear, which are common in heavy-use commercial vans.
Operate the sliding doors repeatedly and check for grinding noises or resistance. | Description: The Isuzu Como's sliding door rollers often fail due to dust and debris, requiring expensive rail and roller assembly replacements.
Inspect the coolant reservoir for oily residue and the exhaust for white smoke upon hard acceleration. | Description: The QR25DE engine can suffer from head gasket issues if the cooling system has been neglected, leading to expensive top-end rebuilds.
Routine oil and filter change using high-quality 5W-30 synthetic, and inspection of the air filter which clogs easily in dusty NZ conditions.
Replacement of platinum/iridium spark plugs and a full transmission fluid flush. Inspect brake pads as these heavy vans consume friction material rapidly.
Major service including water pump replacement, cooling system flush, and a comprehensive inspection of the timing chain tensioner and guide wear.
Engine oil and filter change every 10,000km (do not exceed due to timing chain sensitivity).
Clean and lubricate sliding door tracks and rollers every 6 months.
Inspect serpentine belt for cracking and ensure the tensioner is not vibrating excessively.
Monitor coolant levels and radiator cap seal integrity to prevent overheating.
Check rear leaf spring bushings and shock absorbers for leaks or perishing.
Estimated repair costs if issues arise
Preventative or corrective maintenance for high-mileage units showing signs of stretch.
Common mechanical failure on used imports used for commercial courier work.
The QR25DE pre-cat can disintegrate; replacement is necessary to prevent engine ingestion of ceramic dust.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer