Glow plugs on the Renault Trafic 2017 1.6 dCi are accessible from the top of the engine once the coolant bottle and oil filler are moved aside. No special tools are required — just a quarter-drive 10mm socket and extension.
This procedure is the same for the Vauxhall Vivaro and Nissan Primastar with the same engine. Replace all four as a set at around 80,000 to 100,000 miles.
When You Need This Job
- Long cranking time on cold starts
- Excessive white smoke on cold startup
- Glow plug warning light on the dashboard
- Rough running when cold that improves as the engine warms
Tools You'll Need
Step-by-Step Guide
Move the coolant bottle and oil filler aside
The coolant bottle is held by a tab — release it and turn it to the side. Remove the cap first to relieve any pressure. Undo the return line by squeezing the two tabs and pull it off. The oil filler cap is a 21mm — undo it and tuck the bottle out of the way.
Locate all four glow plugs
With the coolant bottle moved you can see down to the four glow plug tips. They are in a row along the top of the engine.
Pull off all four electrical connectors
Grab each plastic connector extension and pull it off the glow plug. Use long-nose pliers if they are tight — do not pull by the wire.
Unscrew each plug with the 10mm socket
Feed the quarter-drive 10mm socket down onto the plug head on its extension. Use the quarter-drive ratchet to crack it loose then unscrew by hand. Pull each plug out with fingers or long-nose pliers.
Inspect the old plugs
Corroded bodies and burnt tips confirm they were due for replacement. Plugs 3 and 4 may be harder to access due to wiring — work the socket around the wiring carefully.
Apply anti-seize and fit new plugs
Put a small smear of copper slip or installation grease on the threads of each new plug. Start each one by hand — never use power tools. Tighten firmly with the quarter-drive ratchet.
Refit the electrical connectors
Push each connector down onto its plug until you feel and hear a click confirming it is seated. Use long-nose pliers to push them fully home if needed.
Refit coolant bottle and test
Reconnect the coolant return line, refit the bottle into its holder and replace the oil filler cap. Start the engine — it should start notably quicker than before.
This engine is shared between the Trafic, Vivaro and Primastar. The glow plug procedure is identical on all three.
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