What Causes Severe Idle Vibration in Neutral Gear for Ford Focus?

[LeAllie]

Here are the reasons for severe idle vibration in neutral gear for Ford Focus: 1. Excessive spark plug gap or erosion causing misfire and vibration. 2. Dirty throttle body or excessive carbon buildup in intake manifold requiring throttle cleaning, carbon removal and proper calibration. 3. Loose transmission mount requiring engine inspection to check mount condition. Here’s an introduction to this Focus model: 1. Configuration-wise, the EcoBoost180 Trend edition adds keyless entry, one-touch start, TPMS tire pressure monitoring, etc. The 1.5L automatic Trend edition adds panoramic sunroof, one-touch start, TPMS, parking radar and leather steering wheel. 2. Powertrain-wise, the 1.5L EcoBoost turbocharged dual-injection engine integrates over 20 cutting-edge technologies including PFDI dual-injection system and low-inertia mixed-flow turbocharger, delivering 174hp rated power and 243N·m/1750-4500rpm peak torque, paired with 8-speed automatic transmission for both dynamic performance and fuel efficiency. The 1.5L Ti-VCT twin-independent variable camshaft timing engine matches 6-speed manual/automatic transmission, achieving as low as 5.4L/100km combined fuel consumption.

[DelPaige]

Having repaired cars for decades, I've seen many Focus models shaking like that in neutral, most commonly due to ignition system issues. Spark plugs fouled from prolonged use failing to ignite properly, or a faulty ignition coil causing a cylinder to misfire, can make the engine surge and shake erratically. I'd recommend first checking the spark plugs—unscrew them to inspect for oil contamination or carbon buildup blocking them; replacing them is inexpensive. Also, don't overlook a dirty air filter restricting airflow and disrupting combustion balance—try installing a new one. Worn or cracked engine mounts are another major culprit; when those rubber components fail, vibrations transfer directly to the chassis—just feel for looseness to diagnose. Carbon buildup in the idle control valve frequently causes such symptoms too, but a simple cleaning usually fixes it. Left unaddressed, this not only increases fuel consumption but risks damaging other components. A quick inspection can ensure worry-free driving.

[McLila]

My brand-new Focus started violently shaking in neutral after just two years of driving. Later, it was diagnosed as a fuel system issue. Partially clogged fuel injectors caused poor fuel flow, making the engine sputter due to fuel starvation, or possibly an unstable fuel pump supply. Replacing the fuel filter is a cost-effective solution, but fuel quality matters too – low-grade gas easily clogs injectors. Carbon buildup is another culprit; excessive deposits in combustion chambers lead to incomplete burning and unstable idle. You can DIY clean the throttle body or opt for professional decarbonization. If engine mounts are cracked, vibrations become more pronounced – check rubber components' condition. Faulty sensors like O2 sensors can cause ECU miscalibrations and shaking – an OBD scanner quickly reveals the truth. Don't delay repairs; addressing vibrations early ensures smoother driving and saves money long-term.

[AriannaFitz]

Engine shaking is often caused by unstable idling, with a focus on checking for aging or broken engine mounts leading to buffer failure. The ignition system's spark plugs should be replaced when they reach the end of their lifespan to avoid misfires. Cleaning carbon deposits from the intake valves and combustion chambers can improve combustion efficiency. Simple maintenance can resolve most issues and prevent more significant faults.