Rough Idle & Flickering Check Engine Light on Nissan Murano III: What to Check First

Why Does the Check Engine Light Flicker While the Idle Is Rough?

When you see the check engine light flicker rather than stay steady, that's the engine computer's way of telling you it's detecting a serious misfire that comes and goes. On the Nissan Murano III, this almost always goes hand-in-hand with a rough, chugging idle. The most common culprits are worn ignition coils, fouled spark plugs, or a small vacuum leak that throws off the air/fuel mixture. A less common but still possible cause is a dirty or failing mass airflow sensor, which makes the engine run lean and stumble at idle.

Which Sensors and Parts to Inspect First

Before throwing parts at it, grab an OBD-II scanner and read the codes. If you see a P0300 or a specific cylinder misfire code like P0301, start here:

• Ignition coils – The Murano III's coil-on-plug design is a frequent trouble spot. A failing coil may only misfire when warm, causing that flickering light.
• Spark plugs – Worn or carbon-fouled plugs can't fire consistently, especially at idle. Check the gap and electrode condition.
• Vacuum lines – A cracked or loose hose after the MAF sensor can cause unmetered air to enter, leading to rough idle and intermittent misfire codes.
• Mass airflow sensor – If it's dirty, it can misreport incoming air, causing a lean condition. A quick spray with MAF cleaner can sometimes work wonders.

Is It Safe to Keep Driving?

If the check engine light is flickering, that's a warning that unburned fuel is being dumped into the exhaust, which can overheat and ruin the catalytic converter. You can drive a short distance to a nearby shop if you keep the RPMs low and avoid heavy throttle, but honestly, it's safer to have the car towed or to address the issue at home if you're comfortable. An intermittent misfire won't leave you stranded, but ignoring it can turn a $200 coil repair into a $1,200 catalytic converter replacement. Play it smart, get the codes read, and fix it sooner rather than later.

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