How To Clean Your Ford Fusion’s Engine

By Nick Marchenko, PhD

Updated: July 25, 2023

The engine of the Ford Fusion is the mechanical core that governs acceleration, speed, and driving experience. Timely engine maintenance is the key to its long-lasting performance and to prevent potential troubles.

In the course of regular use, the engine slowly accumulates dirt; dust adheres to it, and there may be traces of spilled lubricant, coolant, or other pollutants in different areas.

Such filthiness doesn't only hamper the engine's aesthetics, turning it off-putting due to an excessive amount of mixed grime and contaminants, but it could also dent its efficacy. 

For instance, an engine burdened with a large amount of dirt can be prone to overheating as it disrupts the heat transfer process. Furthermore, when the engine is grimy, identifying external symptoms of malfunctions, like a fresh oil leak or a crack, becomes more challenging.

Therefore, it's crucial to take comprehensive care of your Ford Fusion: exterior (car's body), interior (cabin, engine bay, etc.).

It's recommended to clean your Ford Fusion's engine at least once every few years. Nevertheless, the frequency of engine cleaning should be increased if you reside in an environment constantly exposed to dust, dirt, and sand.

DISCLAIMER / CAUTION:

Cleaning the engine of your Ford Fusion is a nuanced process demanding attention to numerous aspects. Any missteps during the cleaning procedure can result in total engine failure or an expensive repair job.

Hence, to avoid mishaps—we provide an in-depth guide on how to carry out the task, but human error cannot be completely ruled out.

If you need further clarification or are uncertain about handling the engine cleaning on your own, it's recommended to delegate this task to professionals who can perform it swiftly and safely.

Should You Clean the Ford Fusion's Engine?

New Ford Fusion owners frequently ponder over the need for engine cleaning. The auto community is divided over this issue.

The accumulation of dirt and clinging dust can detrimentally impact the engine's performance, leading to issues such as:

• deteriorated heat transfer;
• loss of power;
• elevated fuel consumption;
• the threat of spontaneous combustion.

Upon evaluating these risks, the importance of cleaning the engine becomes evident. There is no fixed schedule for this procedure.

The frequency depends on factors like usage intensity, how you handle your vehicle, and its specific design characteristics. Cleaning the power unit becomes necessary under certain circumstances:

• extreme engine contamination due to faults in pipes, seals, and similar parts;
• detecting the source of fluid leaks;
• prepping the car for major repairs or resale.

What Do You Need to Clean Your Ford Fusion's Engine?

Before embarking on engine cleaning, keep in mind that it demands responsibility, patience, and meticulous attention. Also, ensure you've gathered all the essential tools beforehand, which include:

• Electrical contact cleaner;
• Brush;
• Cloth(s);
• WD-40;
• Hose or pressure washer;
• Car shampoo or degreaser;
• Plastic bags;
• Duct tape;
• Hose for air compressor.

How to Clean Your Ford Fusion Engine?

It's best to clean your engine under favorable weather conditions. It should be warm but not excessively hot, and free from rain or wind. The ideal time for engine cleaning is post-winter. During this period, a significant amount of dirt tends to accumulate on and under the engine, necessitating a good scrub.

Warm Up Your Engine

A gentle warm-up of the engine before cleaning can make the dirt removal process smoother.

Important: Avoid washing the engine when it's at its working temperature - 100 degrees - that's excessive. The sudden contact of cold water with a hot surface could potentially damage the engine or its components.

Refrain from cleaning the engine if you've recently returned from a long drive in your Fusion. Allow it to cool down for about an hour and a half.

The optimal strategy is to start the engine when it's "cold", let it warm up to around 60-65 degrees, then switch it off and wait for 15 minutes. This way, your Ford Fusion's engine will reach the ideal temperature for cleaning.

Disconnect the Negative Battery Terminal

Your first move should be to detach the negative terminal from your Fusion's battery. Doing so de-energizes the entire car's electrical system, and if any water splashes onto the electrical components, you won't have to worry about short-circuiting.

It's an even better idea to take the battery out of the car altogether after you've unhooked both terminals. 

Now, if you find that disconnecting the negative terminal isn't an easy task because of how newer models are designed, don't fret. The key move is still to disconnect that negative terminal.

Manually Remove Large Debris from the Engine Compartment

Under your hood, you'd be surprised how much dirt and debris like leaves, grass, or even stray wrappers can gather. Before you dive into the deep clean, you gotta get these nuisances out of the way. They tend to collect in tiny crevices in the engine bay or even nestle closer to the interior. Take the time to inspect every nook and cranny, and clear out all the dirt. Your engine will thank you for it.

Shield all Electronic Contacts

The most vulnerable parts of your vehicle to water are the electronic equipment, sensors, and wires. Even with the system de-energized during the wash, water can still wreak some havoc.

Without the right protection, contacts can get oxidized, and your electrical equipment could go on the fritz. And here's the kicker, oxidation can creep up on you over time, meaning your car could refuse to start out of the blue, and you'd be none the wiser about why.

So, before you start that engine bath, make sure you've secured every electrical contact under the hood that could potentially get wet. You want to pay extra attention to:

• Sensors;
• Wires;
• Headlight contacts;
• Fuse block under the hood;
• Any other electronic contacts you find under the hood.

There are two tried-and-true methods to protect these contacts:

• Spritz on a special spray that keeps the contacts from getting wet;
• Wrap contacts with plastic bags or cling film, and seal 'em up with duct tape to stop water from splashing onto them.

I'd say go ahead and use both methods. First, use the special spray to create a protective layer that "preserves the contact" from water. Then, wrap these contacts in plastic bags and cinch them tight. You can use electrical tape to ensure the package stays put.
 

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Take a plastic bag and some duct tape to wrap up the fuse block. Make sure all contacts are secure. If you need a little guidance, refer to your Ford Fusion's wiring diagram.

Remember, you gotta protect other vehicle components from water too. Check for any openings in the air supply system where water might get through.

If your ride comes with a carburetor, give it the same plastic bag treatment to keep water out - trust me, you don't want water messing with your power system and causing engine troubles.

Spray the Degreaser or Car Shampoo onto Your Ford Fusion's Engine Surface

Lather up your engine surface with your chosen washing agent. Be generous but not wasteful. You want to get every nook and cranny covered in cleaning shampoo or degreaser.

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Give the Cleaners Some Time to Work

Once the cleaners are on, let them mingle with the grime and dirt. Give 'em about 3-6 minutes to do their magic.

Get Down to Manual Engine Cleaning

Alright, after you've let the cleaners do their thing, it's time to roll up your sleeves and get your hands dirty. Depending on the state of your Fusion's engine, grab a brush or rag and start scrubbing away.

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Stay alert and tread carefully, you don't want to accidentally break anything or cause unwanted damage. Also, keep in mind the exhaust manifold could still be hot, so be mindful not to singe yourself.

If you come across any stubborn grime, don't fret. Just reach for some good ol' WD-40. It's a handy tool for cleaning off rust and ingrained dirt. Just spray some WD-40 on the trouble spot, let it work its magic for a bit, and then start scrubbing.

Rinse Your Ford Fusion's Engine

Once you've given the engine a good scrub, it's time to rinse it down with water. This is the home stretch.

When you're rinsing, make sure to keep the water pressure low (especially if you're using a high-pressure washer) so as not to damage the engine bay. Wash carefully and thoroughly to get all the cleaning chemicals off. Don't let any cleaner residue remain on the engine surface - it could leave stains.

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Blow Out All Electrical Contacts with Compressed Air

Even with the best protective measures, no system is entirely waterproof.

To keep your contacts from corroding and to save yourself from future headaches, make sure to blow them with compressed air once you've unwrapped them from their protective packaging. This way, any water droplets that might've snuck their way onto the contacts get blown away.

Dry the Engine and Its Components Thoroughly

Once the washing part is done, it's time to dry off your motor. Grab some paper towels or dry rags for this.

Make sure you dry off every part of the engine compartment. And if any water managed to get onto the electrical contacts, make sure you dry those off too.

Now, remove the plastic bag and duct tape protection. Inspect every corner of the engine bay to make sure it's dry and clean.

After you've reconnected the battery terminals, fire up your Ford Fusion. Make sure everything's running smoothly.

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Can I clean the Ford Fusion engine at a car wash?

Let's face it, the thought of taking your precious Ford Fusion for an engine wash at a car wash can raise a few eyebrows. You know, the powerful jet streams, the chemicals... they work wonders on the body and parts where there's no risk of dislodging contacts or clogging up vital gaps. But when it comes to under the hood, things can get a little dicey.

The crux of the problem here is reaching those tricky spots without causing short circuits, soaking the air filter, or displacing sensors and nozzles. It ain't easy, that's for sure.

And let's be honest, trying to wash your Ford Fusion engine at a self-service car wash can be a real test of patience, especially when you've got only one tool to do it with.

Now, you've got professional detailing centers that offer specific services for engine cleaning, be it thorough or superficial. But again, things aren't as simple as they seem. The effectiveness of the wash will depend on the techniques used, the equipment, and the chemicals.

What are your options for washing a Ford Fusion's engine at a car wash?

Alright, let's take a look at the kind of engine washing services you can find at a car wash. Keep in mind, these descriptions might not match what's on the service menu at your local car wash, but the end result should be the same:

Surface wash. With this method, they treat your engine just like the rest of your car. Pop the hood, douse everything in a foam solution, and rinse it down according to their protocol. It'll look clean, but that's about it.

Thorough wash. Now, this one takes a bit more time and effort, but the quality of cleaning you get is top-notch. The service could set you back quite a bit though, sometimes even more than a body wash.

The whole engine area gets a thorough cleaning, with every surface and every nook and cranny getting the attention they deserve. They'll even use their hands to clean some parts, armed with sponges, rags, and brushes.

Any parts that might get in the way are taken care of beforehand. And once they're done, your engine will look as clean as the day it left the factory.

To Wrap It Up

Engine washing might not seem like a big deal, but it's actually quite crucial. Getting rid of dirt, dust, grease, and all the other gunk from your engine surface and components is a key part of maintaining your Ford Fusion.

Before you start any washing procedure, always make sure to protect the vulnerable parts, like the wiring, contacts, and the fuse box, so they don't get any water or chemicals on them.

With the right procedures and a bit of care, engine washing can do wonders for your car. It improves cooling, prevents corrosion, and ensures everything under the hood is clean and working smoothly, thereby boosting the life and performance of your Ford Fusion.