How To Clean Your Ford Mustang’s Engine

By Nick Marchenko, PhD

Updated: July 27, 2023

The engine of the Ford Mustang is the mechanical beast that controls acceleration, speed, and overall driving pleasure. To ensure this machine keeps roaring down the track, proper engine care is a must.

Over time, the engine collects a fair share of dirt and grime. Dust, oil slicks, and other undesirable stuff can settle on its surface.

This layer of grime not only dulls the engine's shine but can also affect its performance. So, it's not just about keeping the engine looking sharp, but more about maintaining its horsepower. 

For instance, an engine buried under a heap of dirt can struggle with overheating, as the heat transfer process gets compromised. Also, spotting early signs of potential issues, like a fresh oil leak or fracture becomes a challenge when the engine is dirty.

So, look after your Ford Mustang, both inside and out. Pay attention to the exterior, interior, and most importantly, under the hood.

Make it a rule to clean your Mustang's engine every couple of years. But if you live in a dust-bowl or somewhere sandy, then you might want to do it more frequently.

NOTE TO THE WISE:

Cleaning your Ford Mustang's engine isn't as easy as it sounds. You gotta know what you're doing. Get it wrong, and you could be looking at a dead engine or a hefty repair bill.

To avoid turning a simple clean-up into a full-blown disaster, we've got you covered with a detailed guide. However, remember, even the best guides can't prevent user error.

If you're unsure or if this seems too complicated, best to leave it to the pros. They'll get your engine spick and span without breaking a sweat or, more importantly, without breaking anything else.

Why Should You Clean the Engine of Your Ford Mustang?

Many Ford Mustang owners, especially the rookies, often wonder about the necessity of engine cleaning. Opinions on this topic are as varied as the drivers themselves.

The accumulation of grime and stubborn dust can hinder the engine's performance, leading to the following issues:

• Deterioration of heat transfer;
• Loss of horsepower;
• Increase in fuel consumption;
• Higher risk of spontaneous combustion.

When you consider all these risks, it becomes pretty clear why your Mustang's engine needs a good scrub. However, there's no one-size-fits-all schedule for this chore.

It all boils down to how hard you drive your pony and its unique design features. You only need to roll up your sleeves and get the job done in specific situations:

• Extreme engine contamination due to faulty pipes, seals, or other similar parts;
• Identifying the source of fluid leaks;
• Prepping the car for an overhaul or sale.

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

Cleaning an engine isn't a walk in the park. It requires responsibility, patience, and a keen eye. Also, make sure you have all the necessary gear at hand:

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

How to Clean Your Ford Mustang's Engine?

Plan your engine cleaning for a warm, calm day, ideally with no rain or wind. The end of winter is a perfect time since a lot of gunk accumulates on and beneath the engine during those colder months.

Prep Your Engine

A gentle warm-up before you start cleaning will make the dirt and grime easier to tackle.

Heads Up: Don't get cleaning while the engine's running hot, like at its working temperature of 100 degrees. Splash cold water on a hot engine, and you could damage it or its parts.

Avoid cleaning the engine if you've just returned from a long drive in your Mustang. Let it cool off for around 90 minutes.

Your best bet is to start the cleaning process when the engine is "cold," warm it up to around 60-65 degrees, shut it off, and let it sit for about 15 minutes. Doing so will bring your Mustang's engine to the ideal temperature for cleaning.

Disconnect the Negative Battery Terminal

Step one, you gotta remove the negative terminal from your Mustang's battery. This de-energizes the entire electrical system, which is good news if water splashes on any electrical bits. It saves you from a short circuit catastrophe.

Even better, try to remove the whole battery from the car once you've disconnected both terminals. 

If you're driving one of those new models where disconnecting the negative terminal isn't as straightforward, don't sweat it. Your first job is always to disconnect that negative terminal.

Clear Out the Big Junk from the Engine Bay

Let's face it, stuff builds up under the hood – you know, leaves, grass, last month's fast-food wrappers. Before you start the real cleanup, you gotta remove these bulky intruders. They hide in small crevices in the engine bay or closer to the car's interior. So roll up your sleeves and get to work, inspect every nook and cranny, and eliminate the dirt.

Shield all Electronic Contacts

Your electronic gear, sensors, and wires are like sugar in the rain when it comes to water. Even with the system de-energized, water can still wreak havoc.

Without proper care, the contacts can oxidize, and your electrical equipment can conk out. The sneakiest part is that oxidation might not happen instantly, but after some time. One day, your car refuses to start, and you're left scratching your head.

So, before you start hosing down the engine, protect every electrical contact that could get wet under the hood. Pay particular attention to:

• Sensors;
• Wires;
• Headlight contacts;
• The fuse box under the hood;
• Any other electronic contacts you can spot under the hood.

Now, you've got two reliable ways to safeguard these contacts:

• Spray them with a special waterproofing solution;
• Wrap them with plastic bags or film and seal them up with duct tape to keep water out.

My advice? Use both methods. Start with the waterproofing spray to form a protective layer and then wrap the contacts in plastic and secure them tight. Insulation tape works great to ensure the plastic stays put.
 

Shop From Amazon

Use a plastic bag and duct tape to wrap the fuse box. Double-check that all contacts are secured. If you need a refresher, pull out your Mustang's wiring diagram.

Also, make sure to cover other parts of your car to keep water out. See if there are any holes in the air intake system that water could get into.

If your Mustang's got a carburetor, wrap that baby up too. Last thing you want is water getting into the power system and causing engine trouble.

Slather the Degreaser or Car Shampoo on your Mustang's Engine

Next, you want to get that cleaning agent all over the engine. Be thorough, but no need to drown it. Every nook and cranny should be covered in that cleaning shampoo or degreaser.

Shop From Amazon

Give the Cleaners Some Time to Work

Once you've got the cleaners applied, let them sit for a bit to tackle the grime and dirt. Three to six minutes should do the trick.

Time for Some Elbow Grease

After letting the cleaner sit, it's time to roll up your sleeves and do some manual scrubbing. Depending on how much and what kind of dirt you're dealing with, grab a brush or a rag and get to work on your Mustang's engine.

Shop From Amazon

Be gentle, though, you don't want to cause any damage. And watch out for that exhaust manifold – it could still be hot.

If you run into some stubborn dirt, give WD-40 a try. This stuff's great for getting rid of rust and ingrained grime. Just spray it on, let it do its magic, and then scrub away.

Time to Rinse Your Mustang's Engine

After you've done the hard scrubbing, it's time for the final wash. Now you can rinse off the engine with water.

When doing this, make sure to use the lowest possible water pressure if you're using a high-pressure washer. You don't want to damage the engine bay.

Rinse thoroughly but gently to remove all the cleaning agents from every spot. If any cleaner is left on the engine, it could lead to stains.

Shop From Amazon

Use Compressed Air to Dry All Electrical Contacts

Even with the best waterproofing, nothing's foolproof. There's always a chance some water might have snuck in.

To safeguard against any corrosion, once you've removed the protective coverings, give your electrical components a good blast with some compressed air. This'll ensure any stray water droplets are blown away.

Dry the Engine and All Its Components

Finally, once everything's washed, make sure to dry the engine thoroughly. Use paper towels or dry rags to soak up any remaining moisture.

Wipe down every part of the engine compartment. If there's any water on the electrical contacts, dry them off.

Now, remove the plastic bags and duct tape you used for protection. Inspect every part of the engine bay to make sure it's dry and clean.

Once you've hooked up the battery terminals again, fire up your Mustang and make sure everything's running smooth.

Shop From Amazon

Is it Safe to Clean the Mustang Engine at a Car Wash?

For many Mustang owners, particularly those new to the game, washing at a car wash can be a bit daunting. The powerful blast of water and chemicals might be great for the exterior and parts that don't risk disconnecting contacts or blocking technical gaps, but under the hood? It's a different story.

There's a need to hit those hard-to-reach spots without causing short circuits, drenching the air filter, or shifting sensors and nozzles.

Truth be told, it can be quite challenging to give your Mustang engine a proper clean at a self-service car wash when you've only got one tool at your disposal.

Professional detailing centers, on the other hand, offer specialized services aimed at both deep and superficial cleaning of the engine bay. But even there, it's not simple. The quality of cleaning depends on the tech, equipment, and cleaning solutions used.

Your Options for Washing Your Mustang Engine at a Car Wash

The options we're about to outline for washing your engine at a car wash might vary from place to place, but the outcomes are typically the same:

Surface wash. This is similar to your standard car wash. The mechanic pops the hood, sprays the area with a foam solution, and then rinses it according to their procedure. This will leave your engine looking clean on the surface.

Deep cleaning. This option requires more prep time but delivers higher quality cleaning. The cost of this service can be on par with, if not more than, a body wash.

Every surface is thoroughly scrubbed; grime is removed from even the most hard-to-reach spots, sometimes manually with sponges, rags, and brushes.

Parts that might get in the way are taken out beforehand. Once done, your engine bay is left looking as clean as when it first left the factory.

Wrapping It Up

Engine cleaning might seem like a minor detail, but it's far from it. Removing and washing out all the dirt, dust, grease, and debris from your engine and its components is an essential part of maintaining your Mustang.

Before you get to washing, make sure any sensitive parts like wiring, contacts, and the fuse box are protected to prevent water and chemicals from causing any damage. 

By properly and carefully washing your engine bay, you'll ensure better cooling, prevent component corrosion, and keep everything under the hood in tip-top shape, helping your Mustang perform optimally and last longer.