Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Chart 20
2010 Ford Fusion SEL, 2.5 ASECTION Chart 20
- Engine Noise (under hood)
NOTE:
Attempt to identify the source of the noise. If the noise is from a source other than those listed below, refer to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX (for noise such as spark knock) or the appropriate article
to continue diagnosis.
ENGINE NOISE (UNDER HOOD) SYMPTOM CHART
| SYSTEM/COMPONENT | REFERENCE (article 5 Pinpoint Test unless noted) |
|---|---|
| Secondary Ignition System Snap noise that may be due to secondary ignition arcing. |
For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC
. For all others, CHECK the condition of the spark plug boots. |
| Turbocharger System | REFER to the appropriate Fuel Charging and Controls - Turbocharger article to diagnose the turbocharger noise. |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.