Flickering Check Engine Light and Rough Idle on Your Infiniti QX60 III

What that flickering light is really telling you

On the Infiniti QX60 III, a check engine light that flickers or blinks while the idle stumbles is usually the engine computer reporting a misfire — sometimes a random misfire that comes and goes. That flicker matters more than a steady light because raw fuel can be washing into the catalytic converter. If the light is blinking continuously, treat it as a stop-driving warning; if it only flickers now and then with a rough idle, you still want to diagnose it promptly before a small ignition or intake fault turns into a costly converter repair.

Most likely causes on the QX60 III

Start with the basics that fit this platform: coil-on-plug ignition, direct-injection fuel delivery, and a lot of plastic intake plumbing. A single failing ignition coil or worn spark plug is the classic cause of a rough idle and intermittent misfire code. Beyond that, check for:

• Ignition coils and spark plugs — especially if mileage is over 60,000 or one cylinder’s misfire counter is climbing.
• Vacuum and intake leaks — cracked hoses, loose clamps, or a leaking PCV hose can make idle quality terrible and set lean codes.
• Mass airflow (MAF) sensor and throttle body — carbon buildup or a dirty MAF element skews fuel trim at idle.
• Fuel injectors and fuel pressure — direct-injection engines can suffer carbon-fouled injectors; low pressure causes lean misfires.
• Camshaft/crankshaft position sensors or variable valve timing — less common, but scan data will show erratic timing or sync errors.

What to check first — and can you keep driving?

Before replacing parts, pull the codes with a scan tool that reads live misfire counters and fuel trims. Check misfire counts per cylinder, then inspect the plugs and coils on the affected bank; swap a coil to see if the misfire moves. Smoke-test the intake for vacuum leaks, clean the MAF and throttle body only with the correct spray, and verify fuel pressure if the misfire is random across cylinders. On the road: a steady check engine light with a mild rough idle usually allows a short, gentle trip to a shop, but a flashing light means pull over and stop — you risk catalytic converter damage and raw fuel in the exhaust. Keep the RPMs low, avoid hard acceleration, and don’t clear the codes until the repair is confirmed.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.