Timing chain rattle on cold start (1KR/K3)

Symptoms

Brief rattle at cold start

Likely cause

Tensioner/guide wear, poor oil service

Fix

Chain kit if persistent

Applies to

KGC10/KGC15/QNC10; Boon M300S/M301S/M310S (same platform)

Related fault codes

P1346/75 possible if timing drifts

Confidence

low (same publisher; kicktyres Sirion page has generation errors)

Sources

• kicktyres.com/inspections/toyota/passo
• kicktyres.com/inspections/daihatsu/sirion/m300

Related problems on this car

• No power to fuel pump (KGC10 1KR)
• 1KR oil consumption
• Chirping/whistle from belt area (1KR)
• Stalling at idle with A/C + brake, hard start

Similar problems on other cars

• Timing chain jumps after long oil changes · Toyota Vitz (1st gen)
• Timing chain rattle at idle · Toyota Vitz (1st gen)
• Ticking noise on a cold start (1.3) · Toyota Corolla (11th gen, E170)

Where the parts are · Warning lights · Fault codes · Maintenance

Guidance only – confirm with a mechanic before repairs. All common problems