Toyota Isis: 1ZZ-FE Timing Chain Tensioner Cold-Start Rattle

The 1ZZ-FE 1.8-litre engine in the ANZ11 Isis uses a single-row timing chain with a hydraulic tensioner. The tensioner relies on oil pressure to maintain chain tension; at cold start, oil takes several seconds to fully pressurize the tensioner piston. On worn tensioners or engines with infrequent oil changes, the chain slackens during this low-pressure window and rattles against the timing chain guide and cover. The rattle is a loud metallic chattering sound lasting 2-10 seconds from cold, then disappearing once oil pressure builds. Prolonged operation with a failing tensioner can cause accelerated chain stretch, guide rail wear, and ultimately timing chain skip, which risks valve-to-piston contact. Toyota issued a TSB for 1ZZ-FE tensioner replacement and specified 5W-30 oil to aid faster cold pressurisation.

• Loud metallic rattling from timing cover for 2-10 seconds on cold start
• Rattle absent once engine reaches operating temperature
• Possible stored code P0016 camshaft-crankshaft correlation if chain has stretched
• Increased rattle duration as fault progresses

1. 1

   Perform a cold start with the bonnet open and listen for timing chain rattle from the front-right of the engine near the timing cover.

2. 2

   Confirm rattle disappears within 10 seconds.

3. 3

   Check for P0016 or P0017 fault codes indicating chain stretch.

4. 4

   Inspect oil condition and service history — neglected oil changes accelerate tensioner wear.

5. 5

   If a workshop inspection is possible: A used oil analysis can reveal chain metal debris.

Parts involved: Timing chain.

$550 to $1,400 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 for a few seconds when started cold?”
• “Has the timing chain tensioner been inspected or replaced?”
• “What oil viscosity is used and how often is it changed?”

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.