Why do intake valves get carbon buildup? 🤔 On older engines, fuel sprayed over the valves and kept them clean. But on modern direct-injection BMWs, fuel goes straight into the cylinder. That means: ✅ No fuel washing the valves ✅ Oil vapors from the PCV system stick to them ✅ Heat bakes it all into hard carbon The result? Sluggish throttle, misfires, and lost power. That’s why walnut blasting is the go-to fix, it restores smooth airflow and brings your engine back to life 💨 | RPM Tuning
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