why does my Ford F-150 13th Generation (2015-2020) engine rev high but not accelerate

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

549 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix high engine revs without acceleration in Ford F-150 2015-2020. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before inspecting the transmission or cleaning the throttle body.

Symptoms

•Engine revs increase significantly without vehicle speed increase
•Possible slipping of the transmission
•Unusual engine noise during high revs
•Check engine light may illuminate
•Poor fuel economy
•Delayed or harsh shifting when accelerating

Diagnostic Steps

1
Scan the vehicle for OBD-II error codes using a scanner to identify any related faults.
2
Inspect the transmission fluid level and condition; check for contamination or burnt smell.
3
Check throttle body operation by manually opening it and monitoring response.
4
Inspect the transmission for any visible leaks or damage.
5
Test the accelerator pedal position sensor for proper voltage output.
6
Verify the operation of the vacuum lines connected to the intake manifold and throttle body.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Throttle body cleaner
•Soft cloth
•Transmission fluid pump
•Pliers

Parts Required

•Transmission filter and gasket
•New transmission fluid (specific type per manual)
•Accelerator pedal position sensor (if needed)
•Vacuum lines (if damaged)

Related Faults

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Diagnostic Steps

1
Scan the vehicle for OBD-II error codes using a scanner to identify any related faults.
2
Inspect the transmission fluid level and condition; check for contamination or burnt smell.
3
Check throttle body operation by manually opening it and monitoring response.
4
Inspect the transmission for any visible leaks or damage.
5
Test the accelerator pedal position sensor for proper voltage output.
6
Verify the operation of the vacuum lines connected to the intake manifold and throttle body.

Solution

1. Preparation

Gather tools and necessary parts.
Ensure the vehicle is on a flat surface and engage the parking brake.
Disconnect the battery to prevent electrical shorts during repairs.

2. Inspect and Replace Transmission Fluid

Sub-steps:
1. Place a drain pan under the transmission pan.
2. Remove the transmission pan bolts and carefully lower the pan.
3. Inspect the old fluid for discoloration or burning smell; replace if necessary.
4. Install a new filter and gasket.
5. Refill with new transmission fluid per manufacturer specifications.
Tools Required: Socket set, transmission fluid pump, drain pan.

3. Clean and Inspect Throttle Body

Sub-steps:
1. Remove the air intake duct connected to the throttle body.
2. Use throttle body cleaner and a soft cloth to clean the inside of the throttle body.
3. Reinstall the air intake duct securely.
Tools Required: Throttle body cleaner, soft cloth, screwdriver set.

4. Replace Accelerator Pedal Position Sensor (if faulty)

Sub-steps:
1. Locate the accelerator pedal position sensor under the dashboard.
2. Disconnect the electrical connector from the sensor.
3. Remove the sensor from the pedal assembly.
4. Install the new sensor and reconnect the electrical connector.
Tools Required: Socket set, pliers.

5. Check Vacuum Lines

Sub-steps:
1. Inspect all vacuum lines connected to the throttle body and intake manifold for cracks or disconnections.
2. Replace any damaged vacuum lines as needed.
Tools Required: Vacuum line replacement, cutting tool.