Which risk increases when using water-methanol injection without proper engine tuning in a turbocharged engine?

💡 Explanation

When water-methanol injection is used without proper tuning, lean spikes can occur because the ECU isn't optimized to compensate adding supplementary and highly volatile fuel, inducing uncontrolled pre-ignition events causing knock. Therefore knock risk increases, rather than increased EGT, turbo failure, or clogged injectors which depend on very different fuel control parameters.

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