Honda K24 (K-series, 2.3 and 2.4)

2.4 L · inline-4 · petrol · 2001–2016

Also known as: k24a, k24z, k24w, k24y, 2.4 i-vtec, k series, k24a2, k24z7, k24v7, k24w1, k24a1, k24a4, k24a8, k24z2, k23a1, k23a

The 2.4-litre member of Honda's K-series — dual overhead camshafts, roller rockers to cut friction, coil-on-plug ignition with no distributor, and i-VTEC combining variable valve timing with Honda's variable lift. It is the engine under most Accords and CR-Vs of its era and has a strong reliability record.

The diagnostic subtlety is VTEC itself. Lift switching is hydraulic and depends on oil pressure and clean oil reaching the spool valve; a clogged VTEC solenoid screen produces a car that simply does not make power above the crossover, often with a stored code that names the system rather than the cause. Service history is the diagnosis more often than any component test on this engine.

Later direct-injected K24W variants add high-pressure fuel-system faults the older port-injected engines do not have, so the sub-designation matters. Exhaust cam-lobe and rocker wear on some variants is the other pattern worth knowing about, and it announces itself as a tick that follows engine speed.

Cars fitted with this engine

11 generations, across 2 makes. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.

Acura

Honda

Information, not instruction

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