[All in One] Ford 4.0 SOHC Engine Diagram+ Experts Guide!

If we go back in time, when it was around 2001, the first SOHC engine of 4 liters got introduced by FORD. And it was actually a place taker or the OHV, overhead valve engine 4.0 liter.

The engine was only for the Explorer and Ranger at first, until 2004. And then the Mustang got to use it from 2005. It soon became a staple for the lineup after dropping the 3.8-liter version.

Only when it was 2011 did the Explorer and Mustang switch to even better and more powerful engines. While the 2011 ranger was still using the 4.0-liter SOHC.

Today, we will be giving you a visual demonstration of this staple engine of Ford’s lineup. Yes, it’s going to be about the ford 4.0 SOHC engine diagram along with detail on it and not to mention some notes that are supplementary but quite necessary still.


Ford 4.0 SOHC Engine Diagram

There’s a 3.96 inches cylinder width bore as well as 3.32 inches stroke that makes a whole displacement of 245 cubic inches for the engine. Here’s the Mustang, Ranger, and explorer ford 4.0 SOHC engine diagram.

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Ford 4.0 SOHC Engine Diagram

EGR Vacuum Regulator Solenoid 

The EGR vacuum regulator solenoid is a vital part of the 4.0L SOHC engine that is basically an electromagnetic device. And its job is to control the vacuum supply done to the EGR valve.

With the help of a nut, it’s attached to the engine block while being close to the EGR valve. You should find a rubber vacuum hose from the engine block back at the EGR valve that goes towards the solenoid.

And that way it’s easier to locate. It barely takes a few minutes to replace the part in case of damage. And anyone can conduct the replacement themselves.

The EGR valve will open whenever the temperature of combustion is above 2500 degrees. And that time the vacuum will draw the exhibit in so that it can help in balancing the harmful emissions.

The entire process of the vacuum gets regulated by the valve and in the case of its manufacture, major trouble can take place.

IAC Valve 

This one is also called an idle air control valve or actuator. And this device is in charge of the RPM of an engine, or to be mirror specific the idling rotational speed in the vehicles that are fuel injected.

You can find the part on the throttle body. It works along with the ECU of the vehicle for airflow regulation towards the engine so that idling can be as smooth as possible.

Radio Noise Capacitor 

You will be able to locate this part of the left of the engine towards the top. And the shape is square which you’ll notice in the open hood.

Brake Fluid Level Warning Switch

Sensing the hydraulic braking system associated with brake fluid pressure is the main task of this switch. Any fault in the braking system will be tracked by the sensor, and it’s a pressure-style switch.

Rendering the rake will make it overall less effective. And not to mention the trouble of brake system flush as well as bleed. And this situation needs to be sidestepped.

Only a brake fluid level switch connected with the fluid reservoir of the brake shall help by illuminating the warning light whenever the level is lower than recommended.

DRL Module 

The daytime running lamp module is the full form of this part. The automatic regulation of low beam headlight operation is what the part targets to work on.

Several sensors and switches will send the input to the module. These are the parking brake switch, ignition switch, ambient light sensor, and headlight switch.

DRLs or daylight running lights are automatically on with the model working. The intensity of these lights is lesser than the headlights.

However, in case of trouble weather such as fog, rain, or snow others are able to see you clearly due to the lights. As soon as the module finds the signal it turns the DRLs on.

CKP Sensor 

Async is necessary to maintain the fuel injectors operation as well as the ignition system. The part that helps here is this CKP sensor AKA Crankshaft position sensor.

And it’s an electromagnetic sensor that helps the overall fuel injection system for the above-mentioned purpose. It basically sends a signal to the onboard controller about the crankshaft position and speed.

Airflow Sensor

It’s also known as the A mass flow sensor or AF sensor. And the job is to find the air’s mass flow rate that enters the internal combustion engine, the fuel-injected type. The ECU needs this air mass information for it to transfer the right fuel mass to the engine.

Blower Motor Resistor

Regulation of the blower motor speed is what the blower motor resistor is in charge of. There’re fan speed selections that stay attached with the resistors, one or more, and these are inside the blower resistor assembly.

The overall regulation of the current through the blower motor happens due to any alteration in resistant controls. And that controls and restricts the speed of the blower motor spinning.

Blower Motor

Blower motor powers the fan for the air conditioning system and heating. The location is inside the dash and it should be opposite the steering wheel or firewall situated engine compartments inside.

A/C Clutch Cycling Pressure Switch 

This one is a crucial element of the AC system of any modern-day vehicle. And the part stays on the low-pressure side mounted.

The main job is flowing detection of the system’s refringent through pressure measurements. The cycling switch will close as soon as the pressure goes back to normal.

Ford 4 0 SOHC Engine Specs: A Closer Look!

4.0 can produce around 210 horsepower at an rpm rate of 5300 and around 249 ft-pounds torque at an rpm rating of 3500. This is for the Ford Mustang 2005 to 2010.

In the case of the Ford Ranger, the output is the lowest. It produces around 207 horsepower at an RPM rating of 5250 while the torque is 238 ft-pounds at an RPM rating of 3000.

We saw the ford 4.0 SOHC engine diagram and now if we dig a little deeper, finding some specifications might help. Especially those who could be dealing with one of the 4.0 ford engine problems.

Starting from the internals of the 2004 ford 4.0 SOHC engine

You already know the 3.95 inches bore and 3.32 inches stroke combinedly make the whole engine displacement, which is 245 cubic inches.

For Your Information – Bore is the cylinder width and the traveling distance of pistons inside the cylinder is called a stroke.

Also Read: Ford Ranger Parking Brake Cable Diagram – Location & More!

4.0 has a 9:1 to 9.7:1 compression ratio range and it depends on the model and year one is rereferring to. There is one intake, one exhaust, and two valves in each cylinder, a total of 12 valve counts.

Moving onto the output of ford 4.0 SOHC engine performance

Depending on the vehicle that the 4.0 is used for, the output number can vary.

If we talk about Ford Explorer:

  • The engine produces 210 horsepower at rpm 5100
  • Torque 240 ft-pounds at rpm 3500.

While if we talk about Ford Ranger:

  • The engine produces 207 horsepower at RPM 5250.
  • Torque is 238 ft-pound at RPM 3000

About the fuel economy of the ford 4.0 SOHC engine

It will again depend on the overall application.

If we consider the Ford Explorer:

  • At the highway, it got 20-21 mpg.
  • In the city, it got 14-16 mpg.

While for the Ford Ranger:

  • At the highway, it got 19-21 mpg.
  • In the city, it got 15-17 mpg.

And then there’s 2005-2010 mustang showing the most efficient fuel economy:

  • At highway 26-28 mpg.
  • At city 17-19 mpg.

A Deeper Look at SOHC Engine

Let’s start from the start about it. Now, What Does SOHC Stand For? The single overhead camshaft is a setup that is the full form of SOHC.

There’s a single camshaft that has to control both inlet and outlet gasses. There are one pair of exhaust valves in the engine.

Due to a single camshaft, the control of valve timing is also seen. Whenever there’s the ignition of air and fuel mixture, the internal combustion engine comes into operation.

There are two mandatory factors for the ignition process to work right:

  • The proper removal of exhaust gasses.
  • Timing of injecting fuel.

The camshaft angle will have an impact on the gas’s intake as well as exhaust timing. With better timing, there will be more horsepower.

And so, SOHC is better fuel-efficient. Because there’s lower power consumption here. Typically located spark plugs on the middle of the cylinder is not the case here. There’s no strategic placement here, and so SOHC engine performance hindering happens.

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Also, low-end torque is better with SOHC. And this is due to the better torque-producing 16 valves. That too at a lower speed. But at high speed, the performance drops.

To regulate the intake and exit gasses, there’s just one cylindrical rod so the overall cost is less. Similarly, design-wise there are fewer complications. Manufacturing cost is also down.

The same goes for repair and maintenance expenses. However, since there’s just one set of valves controlling the outlet and inlet, the SOHC engine got some noise-producing issues.

Is SOHC a Good Engine?

For the most part, there are a great strength, performance, and reliability benefits with the engine.

So, anyone wondering is the ford 4.0 SOHC a good engine will be pleased to know, it mostly is. In fact, with proper maintenance, there are also enough ford 4.0 SOHC longevity scores.

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Wrapping Up

And now you have a bunch of information as well as the ford 4.0 SOHC engine diagram. Hopefully, you got the detail you were looking for.

We’ll be ending this guide here.

But we’ll be back very soon again with some similar ford matter that needs explanation. Till then take care and stay tuned!

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