Your Ford F-150 can sound like a diesel for low oil levels and low engine oil temperature. Other factors also can be responsible for this issue. Those factors are
- Low octane fuel
- Carbon-contaminated combustion chamber
- Damaged catalytic converter
- Loose heat shield
- Faulty timing chain tensioner
- Worn or damaged timing chain
- Faulty cam phaser
- Loose or damaged drive shaft
- Worn or damaged main and rod bearings
- Loose VCT gear
Here are only a few reasons why your F150 sounds like a diesel. For a comprehensive solution of these reasons go through the following sections.
Does Your Ford F150 Actually Sound Like Diesel?
The diesel noise in a Ford F150 is a loud rattling sound that resembles a diesel engine. It can be heard when increasing the RPM, during cold starts in extremely cold weather. When the engine is idling at operating temperature, this sound can also be heard.
To differentiate it from other noises, listen for the distinct rattling sound and check for additional signs like a knocking noise. Diesel noise will come from the engine compartment.
Consider other possible causes of the diesel-like noise, such as rattling noise coming from the wheel bearings that are actually not diesel noise. You must be confirmed that your truck is making a diesel noise before going to the further solution part. This is because the solution for the diesel noise and other noises are not the same.
12 Reasons Why F150 Sounds Like A Diesel
Your Ford F-150 may sound like diesel for several reasons. Refer to the table below for a quick overview of those problems and their solutions.
| Reasons for F150 Making Diesel Noise | Diagnosis | Solutions |
| Low oil level | Check the oil level | Add oil to the appropriate level |
| Low-temperature engine oil | Check the oil temperature | Refill engine oil |
| Low octane fuel | Examine the octane rating of the fuel | Use high-octane fuel |
| Carbon-contaminated combustion chamber | Check by the symptoms | Clean the carbon contamination with the fuel system cleaner |
| Damaged catalytic converter | Test the converter with a pressure gauge | Replace the catalytic converter |
| Loose heat shield | Inspect the heat shield | Tighten or replace the heat shield |
| Faulty timing chain tensioner | Visually inspect the timing chain tensioner pulley | Replace the timing chain tensioner pulley |
| Worn or damaged timing chain | Visually inspect the timing chain | Replace the timing chain |
| Faulty cam phaser | Inspect the cam phaser by pressing the gas pedal | Replace the cam phaser |
| Loose or damaged drive shaft | Check the drive shaft | Replace/ repair the drive shaft |
| Worn or damaged main and rod bearings | Check the main rod or bearings with an expert | Replace the main rod bearings |
| Loose VCT gear | Inspect the gear with an OBD | Seek expert assistance |
Now, let’s briefly discuss these issues in the subsequent sections.
Reason 1: Low Oil Level
A low oil level in a Ford F150 can create a sound similar to a diesel engine. When oil is low, it fails to lubricate the engine properly. This lack of lubrication causes metal components to rub against each other, leading to increased friction and noise. The sound is often described as a rumbling or knocking noise coming from the engine. To prevent damage, it is crucial to regularly check and maintain the oil level in your Ford F150.
Diagnosis: Check the Engine Oil Level
To check the engine oil level in your Ford F-150 follow the steps below.
Tools needed:
- A piece of dry cloth
Step 1: Locate the Dipstick
The Ford F-150 dipstick is usually located under the hood on the right side of the vehicle. There will be a different color highlighted plastic holder at the top of the dipstick. Pull the holder to take out the dipstick.
Step 2: Check the oil level
Ensure that you thoroughly clean and dry the dipstick utilizing a clean, dry cloth. Subsequently, reinsert the dipstick into its original position within the oil reservoir. Proceed to remove the dipstick and observe the oil mark present on it. If you find the mark at the low of the stick indicates the low engine oil level.
Solution: Refill Engine Oil
Use a funnel and refill the engine oil level gradually until it comes to the max on the dipstick.
Reason 2: Low Engine Oil Temperature
If your Ford F150 sounds like a diesel engine, it could be due to low-temperature engine oil. When the oil is cold, it becomes thick and doesn’t lubricate the engine properly, resulting in engine noise. But this sound should vanish a few minutes after starting the engine.
Diagnosis: Check The Oil Temperature
To check the engine oil temperature in a Ford F150, you can follow this step:
Look for the oil temperature gauge on the dashboard. Some Ford F150 models have an oil temperature gauge that displays the temperature of the engine oil in real time.
The oil temperature is always 10 to 20 degrees more than that of the engine current running temperature. So it is in the range of 195 F to 250 F. Anything less than this is considered low oil temperature.
There are multiple reasons that can cause low engine oil temperature, such as:
- Faulty thermostat
- Cold weather
- Wrong engine oil type
If the thermostat is faulty it can cause a low oil temperature. This is because if the thermostat is stuck open, it can’t keep the oil’s recommended temperature. You can use an OBD scanner tool to know if the thermostat is bad. The Ford F150 faulty thermostat code in the OBD is P0128. For the instruction on how to read code with an OBD scanner follow steps 1 and 2 of the faulty VCT gear inspection section. If you find the thermostat is faulty you need to replace it.
Solution: Replace the Thermostat
Replacing the Ford F-150 thermostat is a critical procedure. To do it it’s better to consult an automotive expert. However, if you want to do it on your own refer to the video below for a visual guide.
Reason 3: Low-Octane Fuel
Low-octane fuel can make a sound like diesel in a Ford F150. It happens because of pre-ignition or detonation. Pre-ignition means the fuel ignites before the spark plug fires, causing knocking or pinging.
Pre-ignition is when the fuel ignites too quickly, creating high pressure and knocking or pinging sounds. This occurs when low-octane fuel is used in an engine needing higher-octane fuel. A higher octane rating means better resistance to pre-ignition and detonation.
Diagnosis: Examine the Octane Rating of Fuel
Testing the octane rating of fuel at home is prohibited for safety issues. Consult with an automobile mechanic for this. However, in case of urgency, you may do it on your own by taking the proper safety precaution. For this, you’ll need a fuel octane testing kit.
The octane rating is usually prominently displayed in large black numbers on a yellow background on gasoline pumps. Ford now gives the F-150 power ratings based on 87 octane fuel level. However, 91 octanes are recommended for the best performance.
Solution: Use High-Octane Fuel
Use high-octane fuel in your Ford F-150 to prevent diesel noise. As the 91 octanes are recommended, you can use that in place of lower octane fuel. If the existing fuel has an 87-octane rating, you probably don’t need to change it.
However, during the octane rating testing, you should take consultancy regarding this problem. If the octane rating is not the fact, other issues are responsible for the sound like diesel.
Reason 4: Carbon-Contaminated Combustion Chamber
A carbon-contaminated combustion chamber in a Ford F150 can make a sound like a diesel. This happens because the carbon buildup affects the combustion process. When fuel and air mix inside the chamber, the carbon deposits disrupt the ideal conditions for combustion. As a result, the fuel doesn’t burn efficiently, causing incomplete combustion and a sound similar to a diesel engine.
Diagnosis: Check By The Symptoms
Here are some symptoms except diesel noise that indicate the carbon contamination in the Ford F-150 combustion chamber.
- Lack of power or poor acceleration
- Rough running
- Cold stalling
- Engine misfires
- Reduced fuel efficiency
- Engine judder at idle speed
If you find the combustion chamber is contaminated, you need to clean it using a fuel system cleaner.
Solution: Clean The Combustion Chamber With Fuel System Cleaner
To use a fuel system cleaner in the Ford F150, you will need the following tools:
- Fuel system cleaner (specifically designed for gasoline treatment)
- A full tank of gas (up to 22 gallons)
Here is a step-by-step guide on how to use the fuel system cleaner:
Step 1: Pour fuel system cleaner
Add the fuel system cleaner to the fuel tank along with the gas. Be careful not to spill any of the cleaners. It is recommended to use one bottle of Techron for every 20 gallons of fuel.
Step 2: Start the engine
Once the cleaner is added, start the engine and allow it to run. This will help distribute the cleaner throughout the fuel system.
Step 3: Drive the truck
Drive the vehicle as you normally would, using up the treated fuel. This will ensure that the cleaner circulates through the entire fuel system, including the intake valves. It’ll then clean up the carbon buildup in the combustion chamber. You can use this cleaner multiple times to get the desired result.
In case of severe carbon buildup, the fuel system cleaner might not work. As a result, I may need to take the assistance of an automobile expert for further remedy.
Reason 5: Damaged Catalytic Converter
A damaged catalytic converter can cause a diesel-like noise in the Ford F150. When the catalytic converter gets damaged, it may develop internal blockages or fail altogether. This can disrupt the flow of exhaust gases and lead to increased pressure in the exhaust system. As a result, the engine may produce a noise similar to that of a diesel engine.
There are several Symptoms of a Bad Catalytic Converter on a Ford F150 and we have a complete article on that.
Reason 6: Loose Heat Shield
A loose heat shield in the Ford F150 can make a sound like a diesel. The heat shield is a metal plate that protects the undercarriage of the vehicle from excessive heat. When it becomes loose, it can vibrate against other parts, causing a rattling or buzzing noise. This noise can be similar to the sound of a diesel engine.
Diagnosis: Inspect the Heat Shield
Follow these steps to inspect the heat shield of your Ford F-150.
Warning: Before starting the process turn on the engine and let it be completely cool. As the heat shield is a part of the exhaust system, it can burn your hand otherwise. You can also wear gloves for the safety precautions.
Step 1: Locate the heat shield
The heat shield is typically located near the exhaust system, specifically around the catalytic converter and muffler.
Step 2: Check The Heat Shield
Push the palm of your hand against the catalytic converter, exhaust manifold, and other exhaust components. Try to get a feel for any loose elements. If nothing feels drastically lost, try knocking against them with your fist. In case of a loose shield, you’ll feel it moving with your hand.
Solution: Tighten or Replace the Heat Shield
Locate the Ford F-150 heat shield so that you can tighten or replace it. To locate the heat shield follow step 1 of the inspecting section.
Tighten the bolts: If the heat shield is loose due to a loose bolt, use a wrench or socket to tighten the bolts. Be careful not to overtighten the bolts, as this can cause damage to the heat shield or other components.
Replace the heat shield: If the heat shield is damaged or cannot be tightened, it may need to be replaced. To replace the heat shield follow these steps:
Tools needed:
- Socket wrench
- A new heat shield
Step 1: Remove the old heat shield
Use a wrench or socket to remove the bolts that secure the old heat shield to the vehicle. Carefully remove the old heat shield from the vehicle, taking care not to damage any other components.
Step 2: Install the new heat shield
If you’re replacing the heat shield, install the new heat shield in reverse order of removal. Make sure to use the appropriate bolts and torque them to the manufacturer’s specifications.
Step 3: Test the new heat shield
Once the new heat shield is installed, start the vehicle and check for any rattling or unusual noises. If everything sounds normal, the new heat shield is properly installed. If the issue persists, repeat step 2.
With this, you’re done with replacing the heat shield.
Reason 7: Faulty Timing Chain Tensioner
A faulty timing chain tensioner in a Ford F150 can cause a sound similar to a diesel engine. This happens because the tensioner fails to maintain the proper tension in the timing chain, resulting in a rattling or ticking noise. A faulty tensioner can also cause the timing chain to become loose and slap against other engine components, producing a diesel-like sound.
Diagnosis: Visually Inspect the Timing Chain Tensioner Pulley
To visually inspect the timing chain tensioner pulley gather the necessary tools:
- A flashlight
- A socket wrench set
- A pry bar
- A belt remover tool
Now follow these steps:
Step 1: Locate the serpentine belt
The serpentine belt location in a Ford F150 can be found in the front of the engine under the hood.
Step 2: Remove the Serpentine Belt
Using the belt removal tool or a socket wrench, relieve tension on the serpentine belt by rotating the tensioner pulley counterclockwise. Slide the belt off the pulleys and set it aside. And then remove the accessory pulleys that are on the timing chain cover by using a socket and wrench.
Step 3: Remove the Timing Chain Cover
Remove the bolts that secure the timing chain cover to the engine block by using a socket.
Step 4: Locate the Tensioner Pulley
Once the timing chain cover is removed, locate the tensioner pulley. It is typically positioned near the front of the engine, connected to the timing chain or timing belt system.
Step 5: Inspect for Visible Damage
Visually examine the tensioner pulley for any visible signs of damage or wear, such as cracks, chips, or excessive play. Ensure that the pulley spins freely and without resistance.
Step 6: Check for Rust or Corrosion
Using the flashlight, inspect the tensioner pulley for any signs of rust or corrosion that could affect its performance.
Step 7: Apply Pressure with the Pry Bar
Use the pry bar to apply gentle pressure on the tensioner arm while observing its movement.
Step 8: Inspect Tensioner Arm Movement
While maintaining pressure with the pry bar, visually inspect the movement of the tensioner arm for smoothness and absence of resistance. Ensure there are no jerking motions or irregularities.
Step 9: Observe Tensioner Arm Retraction
Release the pressure on the tensioner arm and observe how it returns to its original position. It should retract smoothly and evenly. If not, the tensioner pulley is faulty and you need to replace it.
Solution: Replace the Timing Chain Tensioner Pulley
To replace the Ford F-150 timing chain tensioner pulley, follow these steps.
Tools needed:
- Tools mentioned above
- A new timing chain tensioner pulley
Step 1: Locate the timing chain tensioner pulley
To locate the timing chain tensioner pulley follow steps 1 to 4 of the inspection section.
Step 2: Remove the timing chain tensioner pulley
Use a socket wrench and rotate the bolt counter-clockwise on the tensioner pulley that holds it in place. After removing the bolt, you’ll be able to remove the pulley with your hand.
Step 3: Install the new tensioner pulley
Follow the reverse order to install the new tensioner pulley as it was.
Step 4: Cross-check the chain alignment
Check the alignment of the chain as during the replacement process it could lose its alignment. A properly aligned chain will look like the following image.
Step 5: Adjust the timing chain tension
Rotate the timing chain tensioner pulley clockwise to tighten it. And keep the tension at an optimum level (not too tight or not too loose). You can check the tension by pressing your thumb on the biggest part of the chain. A properly tensioned chain should not bend more than half to one inch.
Before reinstalling the timing all the components check if the timing chain is okay or not.
Step 6: Reinstall all the components
Make sure all components, including the chain cover and accessory pulleys, are reinstalled.
This concludes the timing chain tensioner pulley replacement.
Reason 8: Worn Or Damaged Timing Chain
A worn or damaged timing chain in a Ford F150 can cause a noise similar to a diesel engine. The timing chain is responsible for synchronizing the rotation of the engine’s camshaft and crankshaft. When it wears out or gets damaged, it may produce a rattling or grinding noise.
This noise occurs because the chain can’t properly control the movement of the engine’s valves and pistons. As a result, it causes them to collide and create a diesel-like sound.
Diagnosis: Visually Inspect the Timing Chain
Follow these steps to visually inspect the timing chain of your Ford F-150.
Tools needed
- All the tools mentioned in the tensioner inspection segment
Step 1: Locate the timing chain
The timing chain can be located by following steps 1 to 4 of the inspection section.
Step 2: Visually inspect the timing chain
Some visual signs indicate the timing chain is worn or damaged. Check these signs:
- Stretched timing chain: Over time, the timing chain will stretch due to wear. This can be visually inspected by checking the slack in the chain. If the chain is loose, it may need to be replaced.
- Broken timing chain: Inspect the broken timing chain. By carefully inspecting you’ll find out if it’s broken.
In case of a worn or damaged timing chain, you need to replace it.
Solution: Replace the Timing Chian
To replace the timing chain follow the step-by-step guide below.
Tools needed:
- All the tools mentioned above
- A new timing chain
- A ratchet
Step 1: Locate the timing chain
You can locate the timing chain by following steps 1 to 4 of the inspection section.
Step 2: Remove the timing chain
Remove the timing chain by loosening its tension by rotating the tensioner pulley counter-clockwise. Rotate the tensioner with the ratchet until the become enough loose to take it out. After that, take it out of the sprocket.
Step 3: Install the new timing chain
By following the reverse order, install the new timing belt on the sprocket. After that, fix the alignment and tension of the timing chain. To do this follow steps 4 and 5 of the timing tensioner pulley replacement.
Step 4: Reinstall all the components
By following the reverse order, install the pulleys and components you removed before.
With this, you’re done with replacing the timing chain.
Reason 9: Loose Or Damaged Drive Shaft
A damaged drive shaft can cause a sound like a diesel engine in a Ford F150. The driveshaft connects the transmission to the rear axle. When it’s loose or damaged, it can create a loud noise. The damaged driveshaft may cause vibrations and rattling sounds as it rotates, producing a diesel-like rumble. This noise is due to the misalignment or imbalance caused by the damaged driveshaft components.
Diagnosis: Open and Check the Driveshaft
You’ll find the complete diagnosis process and solution regarding the driveshaft issue in the Ford F150 rear differential problems.
Reason 10: Worn Or Damaged Main Rod Bearings
Ford F-150s can make a sound similar to a diesel engine if their main rod bearings are damaged or worn out. As these bearings wear out or become damaged, they create excessive space between the crankshaft and the connecting rods. This leads to metal-to-metal contact, resulting in a knocking or rumbling noise. The sound is often more noticeable during acceleration or at higher engine speeds.
Diagnosis: Check The Main Rod Bearings By An Expert
The best way to identify worn or damaged main rod bearings is to listen for a distinct diesel-like noise while the engine is running. If you hear this noise, it’s recommended to have the engine checked by a skilled mechanic. Because for further diagnosis, you need to disassemble the full engine compartment.
Disassembling the engine is a complex process that requires specialized tools and expertise. Without specific equipment like a bore gauge or micrometer, visual inspection of the bearings can be difficult even when the engine is disassembled. Therefore, relying on the expertise of a qualified mechanic is crucial for an accurate diagnosis.
Solution: Replace the Main or Bearings
Replacing the Ford F-150 main rod and bearings is a complicated and lengthy process. It needs a high level of expertise and advanced equipment. So it’s better to consult with an automobile expert.
Rod bearings for a Ford F150 can cost under $50 depending on the application and engine.
Reason 11: Faulty Cam Phaser
When the cam phasers in a Ford F150’s engine go bad, they can cause diesel-like noise. This noise is usually a ticking or clicking sound coming from the front of the engine. The lack of lubrication or buildup of debris in the cam phaser is usually the reason behind this noise, and it is caused by faulty oil control solenoids.
Diagnosis: Inspect The Cam Phaser By Pressing the Gas Pedal
To check if the cam phaser is faulty in the Ford F150, you can follow these steps.
Step 1: First, make sure that the truck has been standing for a few hours or overnight, or this is the first start of the day.
Step 2: Next, get in the driver’s seat and depress the gas pedal fully to the floor.
Step 3: While holding down the gas pedal, turn the key in the ignition for about 6 seconds. You should hear the engine cranking, but it should not start.
Step 4: By depressing the gas pedal, you are telling the engine to enter the “clear flood mode,” which stops fuel from being injected into the cylinders. At the same time, turning the key will activate the starter, which will turn the engine over. It will allow the engine to create enough oil pressure.
Step 5: After about 6 seconds, release the gas pedal and turn the key again. This time if you don’t hear any startup rattle then it’s surely the cam phaser issue.
In case of a faulty cam phaser, you need to replace it.
Solution: Replace the Cam Phaser
Replacing the Ford F-150 cam phaser is a difficult task. It needs to disassemble almost the whole engine compartment. So, it’s better to have it fixed by a professional mechanic. Ford F150 cam phaser replacement cost is around $850 if you take your vehicle to a mechanic or a dealership
Reason 12: Loose VCT Gear
When the VCT gear is loose in the Ford F150, it can create a sound similar to that of a diesel engine. The VCT gear controls the timing of the engine valves. When it becomes loose, it can cause the valves to open and close at the wrong time.
This disrupts the engine’s combustion process, leading to a noise resembling a diesel engine. It’s important to address this issue promptly to prevent further damage and maintain optimal engine performance.
Diagnosis: Inspect the VCT Gear With An OBD
To diagnose VCT gear issues in a Ford F150 using an OBD scanner, follow these steps:
Step 1: Locate the OBD-II port in your Ford F150
The OBD scanner port is usually located under the dashboard on the driver’s side.
Step 2: Plug the OBD scanner into the OBD-II port
Ensure that the ignition is off before connecting the scanner. Then insert the scanner cord into the port. After that, turn the ignition key to the “On” position without starting the engine. This will power up the OBD scanner.
Step 3: Read the codes for VCT issues
Follow the instructions provided by the scanner’s manufacturer to navigate through the menu and select “Scan” or “Read Codes.” This will initiate the scanning process.
The OBD scanner will communicate with the vehicle’s onboard computer and retrieve any stored diagnostic trouble codes (DTCs). These codes will help identify specific issues.
- P0010: “A” Camshaft Position Actuator Circuit (Bank 1)
- P0011: “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)
- P0012: “A” Camshaft Position – Timing Over-Retarded (Bank 1)
- P0020: “A” Camshaft Position Actuator Circuit (Bank 2)
- P0021: “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)
- P0022: “A” Camshaft Position – Timing Over-Retarded (Bank 2)
In the case of these codes, you need to further diagnose the VCT system with the help of an automotive expert.
Solution: Seek For Expert Assistance
The VCT (Variable Cam Timing) system is intricate, requiring specialized tools and equipment for diagnosis and repair. If you suspect loose or malfunctioning VCT gear, it’s advisable to seek a mechanic’s expertise for a thorough diagnosis and appropriate repairs.
Here are some other reasons that may also cause a sound like diesel:
- Damaged Valve Lifter
- Faulty Spark Plugs
- Leaky Exhaust System
- Contaminated injectors
For the solution to these issues, you can refer to the “why does My F150 make a ticking noise”.
How Can I Make My Ford F150 Engine Quieter?
To make your Ford F150 engine quieter, you can try these tips:
- Use synthetic oil: It has better lubrication properties than conventional oil, reducing engine noise
- Use high-quality motor oil: High-quality motor oil ensure the smooth rotation of the motor and keep the engine quiet
- Regularly check for engine issues: Regular inspection can prevent engine issues that make noise
- Check the idle speed: Adjust the idle speed if it’s too high or too low
FAQs
Why Is My Car Engine So Loud When Idling?
Your car may be loud when idling due to cylinder compression issues. When compression is compromised, the fuel-air ratio becomes uneven, leading to unusual combustion. This results in higher pressure inside the cylinder and a noisy idling sound.
Why Does My Car Sound Like An Airplane?
Your car may sound like an airplane because the wheel bearing has likely been damaged or broken. The wheel bearings come sealed from the factory. Water, debris, and other elements are protected from high-temperature grease by the seals. When the seal is compromised, the bearing fails and makes a noise. Some people have compared this sound to airplanes, rumble strips, and helicopter propellers.
Is Diesel Noisier Than Petrol?
Yes, diesel is noisier because the combustion process in a diesel engine is more vigorous, resulting in stronger vibrations. These vibrations contribute to the overall noise produced by the engine, making diesel cars generally louder than their petrol counterparts.
Final Words
Well, we’re at the end of the discussion on why my Ford F-150 sounds like a diesel. Hopefully, this will assist you to get rid of this issue if you follow these correctly. It’s noteworthy that diesel noise is not always a problem. So, be sure whether the noise is actually a problem.
Thanks for your perseverance!
