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.

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HOMESERVICE MANUALSFORD2004MUSTANG BASE, 2D COUPE, 3.9 6, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE ACCELERATION CONTROL SYSTEMDIAGNOSIS AND TESTINGACCELERATION CONTROLSYMPTOM CHART

2004 Ford Mustang Base, 2D Coupe, 3.9 6, Automatic

Symptom Chart

2004 Ford Mustang Base, 2D Coupe, 3.9 6, AutomaticSECTION Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Excessive effort needed to depress accelerator pedal and shaft	Worn accelerator lever pivot bushing.	INSTALL a new accelerator pedal and shaft.
	Accelerator cable binding.	INSTALL a new accelerator cable.
	Worn or damaged throttle body.	INSTALL a new throttle body. REFER to FUEL CHARGING & CONTROLS - 3.8L & 3.9L or FUEL CHARGING & CONTROLS - 4.6L (2V) .
Accelerator pedal and shaft feels rough or raspy	Frayed or binding accelerator cable.	INSTALL a new accelerator cable.
Accelerator pedal and shaft feels rough or raspy	Worn or damaged throttle body.	INSTALL a new throttle body. REFER to FUEL CHARGING & CONTROLS - 3.8L & 3.9L or FUEL CHARGING & CONTROLS - 4.6L (2V) .
Accelerator pedal and shaft binds or sticks	Kinked accelerator cable.	INSTALL a new accelerator cable.
	Foreign object caught in accelerator pedal linkage.	CHECK the accelerator pedal linkage.
	Worn or damaged throttle body.	INSTALL a new throttle body. REFER to FUEL CHARGING & CONTROLS - 3.8L & 3.9L or FUEL CHARGING & CONTROLS - 4.6L (2V) .
High engine idle speed	Kinked accelerator cable.	INSTALL a new accelerator cable.
	Foreign object caught in accelerator pedal linkage.	CHECK the accelerator pedal linkage.
	Incorrect engine idle speed.	REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis and testing of the idle control system.

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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.