Parts for your 2008 Ford Transit-Spark plugs

2008 Ford Transit spark plugs

Based on technical references including the Ford Transit Owner’s Manual (2006–2013 series), Ford workshop manual (Duratorq TDCi, Section 303-00), and 2008 Ford Australia/NZ model specifications, the 2008 Ford Transit sold in Australia and New Zealand is almost exclusively fitted with Duratorq TDCi diesel engines (2.2 or 2.4). Diesel engines use compression ignition and do not run spark plugs. Instead, they use glow plugs to aid cold starting and efficient combustion when the engine is cold.

That’s why spark plugs aren’t relevant for most 2008 Transit servicing in this region. A diesel fires the fuel–air mix by squeezing it until it gets hot enough to ignite on its own, so there’s no need for an external spark. The Owner’s Manual covers a glow plug indicator on the dash and provides no spark plug maintenance schedule for diesel variants, which squares with Ford’s workshop procedures for these engines.

There were petrol Transits in some markets around this generation (commonly a 2.3 Duratec), and those do use spark plugs. However, they were rare in AU/NZ. If a 2008 Transit here is a petrol conversion or an imported petrol model, then standard spark plug maintenance applies.

• How to tell what it has under the bonnet:
  • Fuel type on the filler cap and compliance plate: diesel = no spark plugs.
  • Under-bonnet look: a diesel shows a glow plug rail and injectors, a petrol shows coil-on-plug units or plug leads.
  • Documentation: the Owner’s Manual service section lists spark plugs only for petrol, diesel sections reference glow plugs.

For diesel 2008 Transits, a good service routine focuses on items that influence starting and combustion quality: healthy glow plugs, clean fuel and air filters, strong battery/charging system, and injector diagnostics if cold-start or smoke issues crop up. Glow plugs aren’t a fixed-interval item in Ford schedules, they’re tested and replaced when performance drops (hard starting, rough idle when cold, warning light). Many last well past high kilometre figures if the electrical and fuel systems are in good nick.

If a rare petrol 2008 Transit is in play, spark plugs are a must-do service item. Fit the plug type specified by Ford, check the gap if applicable, and torque them correctly on a cool engine. Heat-range and plug design (iridium/platinum) should match the handbook or workshop manual. Misfires, poor economy, or hard starting are typical signs it’s time to replace them.

Popular questions

Does a 2008 Ford Transit have spark plugs?
For AU/NZ models, typically no. Most 2008 Transits here are Duratorq TDCi diesels, which use glow plugs rather than spark plugs. Only rare petrol or special-order/imported variants from that era will have spark plugs.

How can an owner check if their 2008 Transit uses spark plugs or glow plugs?
Check the fuel label and compliance plate for diesel or petrol. A quick look under the bonnet helps too: a diesel shows a glow plug rail and high-pressure injectors, a petrol shows coils or plug leads on the cam cover. The Owner’s Manual service schedule will also list spark plugs only for petrol engines.

What should be serviced instead of spark plugs on a diesel 2008 Transit?
Focus on glow plug condition, battery health, fuel and air filters, and injector performance. Keeping these spot-on improves cold starts, reduces smoke, and keeps economy sharp—exactly where a diesel benefits most.