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Fox Body Engine Bay Diagram (1986-1993)
Created by Taylor Ward
Last Updated 9/7/2021
LMR breaks down each part in your Fox Body's engine bay with this easy to use infographic. Find out which parts you may be missing and pick up the direct replacement parts you need.
Upper Intake Plenum - The upper intake plenum on your Fox Body Mustang is usually the first thing that someone sees in your engine bay. The factory plenum looks great, but most opt for a performance intake that allows your engine to make more horsepower while dressing up your engine bay.
Distributor - The distributor in your Mustang’s engine passes electrical current from the coil to each spark plug in a rotational manner. The distributor drive gear is driven by the camshaft which determines the speed that the electricity is distributed.
Mass Air Flow Sensor - Your Mustang’s mass air flow sensor is a sensor mounted in the intake tubing used to measure the mass flow rate of the air entering into your engine. It relays this information to the ECU to disperse the correct fuel for optimal performance.
Air Filter Housing - If your Fox Body is still relatively stock, you most likely still have the factory air filter housing installed. It will be a black box located in the bottom left hand of your engine bay and connects to your air intake tubing. It houses an air filter to filter incoming air of any contaminants.
Alternator - The alternator in your Mustang helps to charge the battery when your car is running. While the engine is operating, the serpentine belt is spinning which turns a pulley on the alternator. This generates power that is sent to the battery to keep it fully charged.
Belt Tensioner - Speaking of the serpentine belt, the reason why the belt stays pressed firmly against the pulleys is the utilization of a belt tensioner. The belt tensioner mounts to your engine and is equipped with an arm and free spinning pulley that creates tension on the belt to keep it from becoming loose and slipping.
Overflow Tank - The overflow tank is a plastic tank that collects any coolant that has expanded in the radiator and recycles it back into the coolant system after it has lost enough heat.
Radiator Cap - While it may seem like just a metal cap, the radiator cap has a special purpose. The radiator cap creates pressure to keep your cooling system at a higher PSI which increases your coolant’s boiling point. This helps your coolant absorb more heat from your engine.
Battery - The battery is one of the single most important parts of your engine bay. A car battery provides power to your motor that enables the motor to function. With a dead battery, you will not be able to start your car nor use any of it’s electrical functions.
Power Steering Pump - The power steering pump works in conjunction with your steering rack to make turning your wheels as easy as possible. The pump uses fluid to create pressure to help move the wheels with ease.
Brake Master Cylinder & Booster - The heart of your brake system, the brake master cylinder and booster, it the reason your brakes operate so easily. The booster and master cylinder work in conjunction using vacuum and a system of brake lines to distribute brake fluid to each caliber/drum.
Windshield Wiper Motor - At the back of your engine bay, mounted on the firewall, is the windshield wiper motor. This motor powers your windshield wipers. From the factory, this is neatly covered with a plastic cover, but these are usually lost or broken over time. Luckily LMR has a replacement Fox Body windshield wiper motor cover to make the fix.
Hood Ground Strap - The ground strap that connects from your hood to the chassis helps to ground your underhood light. This strap is near the back of your engine bay on the passenger side.
10 Pin Connector - Commonly referred to as the Fox Body salt and pepper shakers, these connectors serve as the main engine to body wiring harness junctions. These commonly become corroded or the bracket breaks. Luckily, LMR has you covered with a new Fox Body 10 pin connector mounting bracket.
EGR Spacer - Your Fox Body's EGR spacer is a vital part to your 5.0 exhaust gas recirculation system. It also provides a mounting point for your throttle cable.
EGR Vacuum Regulator Solenoid - Another important part of your EGR system is the vacuum control solenoid. This part is operated by the PCM and allows vacuum to the EGR valve.
Idle Air Control Motor - This IAC is a solenoid that bolts to the throttle body and controls idle changes caused by engine loads. When your IAC is going out, you may experience surges or poor idle quality.
Air Inlet Hose - The air inlet hose is your factory intake tubing that delivers air from the air box to your engine and throttle body.
Oil Filler Cap - The oil filler cap is the cap to the oil filler neck where the oil is filled on your engine.
Mass Air Flow Meter - The mass air flow meter is a meter that sits in your intake tubing and reads the amount of air coming into your engine to adjust for the correct fuel.
Radiator - Your Fox Body radiator is the main component of your cooling system. A radiator cools hot coolant after it has traveled through your engine using air coming through the front bumper.
Spout Check Connector - The purpose of the spout connector is to complete the circuit to the distributor to allow the PCM to have timing control. You remove the spout connector to disable PCM timing control so you can accurately set your base timing by twisting the distributor and using a timing light.
Engine Coolant Temperature Sensor - A fundamental part of regulating air/fuel ratio, ignition timing, and EGR flow. A malfunctioning Mustang coolant temperature sensor can provide false information to your Mustang's computer that could cause anything from erratic idle to catastrophic engine failure on your Mustang Engine!
Fuel Injectors - Fuel injectors are one of the main reasons your fuel gets to your engine correctly. They disperse fuel in a fine mist in a specific volume to deliver just the right amount of fuel for your engine to operate at it's best potential.
Water Pump, Fan & Fan Clutch - The water pump, fan, and fan clutch are parts of your coolant system that help cool and move coolant throughout your engine.
Center Line Crash Sensor - The center line crash sensor is located at the front of your Fox Body to detect front end collisions for air bag equipped cars.
Power Steering Fluid Resevoir - The power steering fluid reservoir holds the fluid that powers the steering system in your Fox Body.
Ignition Coil - Your ignition coil on your Fox Body supplies voltage to your distributor which transfers the electricity to your spark plugs. It is easy to find by tracing the single spark plug wire from the distributor.
Starter Relay - Commonly known as a starter solenoid, the start relay switches a large electrical current to the starter to start your engine.
Engine Oil Dipstick - Providing you an easy way to check your oil levels, the engine oil dipstick has markings on the very bottom to show you exactly how much oil you have in your motor.