A flickering check engine light paired with a rough idle on a Toyota Land Cruiser 100 often points to ignition or vacuum issues. Here’s what to check first and whether it’s safe to drive.
Common Causes of a Flashing Check Engine Light and Rough Idle
When your Land Cruiser 100’s check engine light flickers—especially under load or at idle—and the engine feels shaky, it’s usually a sign of a misfire. The most frequent culprits are worn spark plugs, failing ignition coils, or a vacuum leak. On the 2UZ-FE V8, spark plugs should be replaced every 60,000 miles; if they’re overdue, they can cause intermittent misfires. Coil packs on these engines are known to crack or degrade over time, leading to weak or no spark at certain cylinders. A vacuum leak—often from a cracked intake hose or a leaking brake booster line—will lean out the air-fuel mixture, triggering the same symptoms.
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