Acura TSX CU2

The 2.4-liter i-VTEC is regarded as one of the toughest four-cylinders of its era and easily surpasses 300,000 km with regular oil changes. Its weak spot is the oil-fed timing chain and VTC actuator: neglect the oil and the chain stretches while the actuator wears, showing up as a cold-start rattle. From around 150,000 km some model years develop elevated oil consumption from piston-ring wear. Oil changes every 8,000 km with approved oil are mandatory, as is periodic valve-clearance inspection since the valvetrain has no hydraulic lash adjustment.

• !! Timing chain stretch and tensioner wear from 180,000 km

  With neglected oil changes the timing chain stretches past its wear limit and the hydraulic tensioner can no longer compensate. If the tensioner rod protrudes over 13.5 mm the chain is due. Result is a P0341 code.

  Symptoms: Persistent rattle from the timing drive (not just on cold start), check-engine light with P0341, and in extreme cases chain skip and engine failure.
  600–2,000 $
  Ad timing chain kit K24 14510-PRB-A01chain tensioner Honda 2.4timing chain K24A2
• !! VTC actuator rattle on cold start from 160,000 km

  Worn lock-pin spring in the VTC actuator: until oil pressure builds, the engine rattles or grinds briefly on cold start. Honda issued TSB 09-010 for this. Harmless at first but can damage chain guides over time.

  Symptoms: Brief rattle/grind for 1-2 seconds on cold start that clears once oil pressure builds. With advanced wear, rough idle and a check-engine light (P0341) can appear.
  400–2,600 $
  Ad VTC actuator 14310-R5A-305cam phaser K24VTC actuator Honda 2.4
• !! Elevated oil consumption from piston-ring wear from 150,000 km

  Especially 2008-2013 model years tend to consume oil as piston rings wear and oil enters the combustion chamber. Honda acknowledged this via TSB 13-077 (replace pistons/rings). It led to a US class-action settlement.

  Symptoms: Dropping oil level with no visible leaks (up to 1 quart per 4,000-5,000 km), blue smoke under acceleration, and eventually P0420 from a fouled catalytic converter.
  300–3,500 $
  Ad piston ring set K24ZPCV valve Honda 2.4pistons K24Z3

+ 2 more engine weaknesses + vehicle weaknesses