Chart 20

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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 applicable Service Information to continue diagnosis.

SYSTEM/COMPONENT	REFERENCE (Pinpoint Test unless noted)
Secondary Ignition System	CHECK for a snap noise that may be due to secondary ignition arcing. For Fiesta 1.6L TIVCT, GO to PINPOINT TEST JC . For all others, CHECK the condition of the spark plug boots.
Turbocharger System	REFER to the Fuel Charging And Controls - Turbocharger article to diagnose the turbocharger noise.