Chart 20

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

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 the Symptom Index (for noise such as spark knock) or the applicable service information article.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TEST - GASOLINE MODELS unless noted)
Snap noise that may be due to secondary ignition arcing: Secondary Ignition System	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.