Mitsubishi Mirage: 3A92 Timing Chain Guide Wear — Cold-Start Rattle

The 1.2 L 3A92 three-cylinder uses a plastic-composite timing chain guide and tensioner rail on the wet side of the engine. In production years 2012–2017 the guide material is insufficiently robust for the short oil-film build-up time at cold start, leading to accelerated wear. The worn guide allows the chain to whip against the aluminium cover, producing a characteristic metallic rattle for the first 5–30 seconds after a cold start. If left unaddressed the guide can fragment, depositing plastic into the oil sump; in severe cases the chain skips timing and causes bent valves. Mitsubishi issued a revised guide kit (part prefix MD-series) as a running production change from approximately 2018.

• Metallic rattling noise at cold start that clears within 30 seconds
• Rattle is louder in cold ambient temperatures (below 10°C)
• Engine oil inspection reveals fine plastic or metallic particles
• Check Engine light with camshaft/crankshaft correlation code (P0016/P0017) in advanced cases
• Visible blue or white smoke on start-up if guide debris has contaminated piston rings

1. 1

   Cold-start the engine after it has been off overnight.

2. 2

   Listen from the passenger-side front wheel arch area for a metallic chain rattle that disappears within 30 seconds.

3. 3

   Check the oil filler cap for sludge.

4. 4

   Pull the engine oil dipstick and look for grit or metallic debris in the oil.

5. 5

   Ask to see service records confirming regular oil changes at 7,500 km or less.

Parts involved: Timing chain.

$650 to $2,200 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.

• “Does the engine make a rattling noise when first started in the morning?”
• “Has the timing chain or any engine internal components ever been inspected or replaced?”
• “Can you show me oil change service records for the life of the car?”

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.