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What is the spark plug gap on 2004 mercmoumtaineer with 4.0 engine?

I cannot give you the exact spark plug gap for your 2004 Mercury Mountaineer with a 4.0L engine. Here's why:

* Engine Variations: Even within the same model year, there might be slight variations in the engine depending on options or manufacturing changes. The recommended spark plug gap can change between these variations.

* Spark Plug Type: The recommended gap can vary depending on the type of spark plug you're using (brand, material, etc.).

How to Find the Correct Spark Plug Gap:

1. Consult your Owner's Manual: The most reliable source for this information is your vehicle's owner's manual. Look for a section on engine specifications or spark plug replacement.

2. Check the Spark Plug Packaging: If you're replacing your spark plugs, the packaging of the new ones will usually have the recommended gap printed on it.

3. Consult a Reputable Mechanic: If you can't find the information yourself, a trusted mechanic can help you determine the correct spark plug gap for your specific vehicle.

Important Note: Using the wrong spark plug gap can negatively affect engine performance, fuel efficiency, and even cause damage. Always use the gap specified by the manufacturer.