Ford 2005 Mustang v.3 User Manual download pdf (Page 215)

Do not be concerned if your engine sometimes knocks lightly. However, if

it knocks heavily under most driving conditions while you are using fuel

with the recommended octane rating, see your authorized dealer to

prevent any engine damage.

Fuel quality

If you are experiencing starting, rough idle or hesitation driveability

problems, try a different brand of unleaded gasoline. “Premium”

unleaded gasoline is not recommended for vehicles designed to use

“Regular” unleaded gasoline because it may cause these problems to

become more pronounced. If the problems persist, see your authorized

dealer.

It should not be necessary to add any aftermarket products to your fuel

tank if you continue to use high quality fuel of the recommended octane

rating. Aftermarket products could cause damage to the fuel system.

Repairs to correct the effects of using an aftermarket product in your

fuel may not be covered by your warranty.

Many of the world’s automakers approved the World-wide Fuel Charter

that recommends gasoline specifications to provide improved

performance and emission control system protection for your vehicle.

Gasolines that meet the World-wide Fuel Charter should be used when

available. Ask your fuel supplier about gasolines that meet the

World-wide Fuel Charter.

Cleaner air

Ford endorses the use of reformulated “cleaner-burning” gasolines to

improve air quality.

Running out of fuel

Avoid running out of fuel because this situation may have an adverse

effect on powertrain components.

If you have run out of fuel:

• You may need to cycle the ignition from OFF to ON several times after

refueling, to allow the fuel system to pump the fuel from the tank to

the engine.

• Your Service engine soon indicator may come on. For more

information on the Service engine soon indicator, refer to the

Instrument Cluster chapter.

Fuel Filter

For fuel filter replacement, see your authorized dealer. Refer to

scheduled maintenance information for the appropriate intervals for

changing the fuel filter.

2005 05+ Mustang (197)

Owners Guide (post-2002-fmt)

USA (fus)

Maintenance and Specifications

215

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