Why is my 2021 Ford Explorer losing power during acceleration?

Ford Explorer Sixth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

718 words

Problem Statement

Learn how to diagnose and fix power loss during acceleration in a 2021 Ford Explorer with step-by-step instructions and required tools.

Affected Component

engine, throttle, fuel system, exhaust system, ignition system, transmission

Symptoms

•The engine hesitates or stutters during acceleration.
•The vehicle struggles to maintain speed or does not accelerate as expected.
•Possible warning lights on the dashboard (e.g., check engine light).
•Unusual noises from the engine or exhaust.

Diagnostic Steps

1
Check for Diagnostic Trouble Codes (DTCs)
2
Inspect the Throttle Body
3
Check the Air Intake System
4
Inspect Fuel System
5
Check for Exhaust Restrictions
6
Inspect Spark Plugs and Ignition System
7
Evaluate Transmission Performance

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
•Screwdriver set
•Cleaning supplies (throttle body cleaner)
•Flashlight
•Vacuum gauge
•Fuel pressure gauge
•Wrench set
•Exhaust backpressure gauge (optional)
•Spark plug socket
•Torque wrench
•Multimeter
•Transmission fluid dipstick (if applicable)

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Solution

Diagnosis of Power Loss During Acceleration in a 2021 Ford Explorer

Symptoms:

The engine hesitates or stutters during acceleration.
The vehicle struggles to maintain speed or does not accelerate as expected.
Possible warning lights on the dashboard (e.g., check engine light).
Unusual noises from the engine or exhaust.

Diagnostic Steps:

Check for Diagnostic Trouble Codes (DTCs):
- Tools Required: OBD-II scanner
- Instructions:
  - Connect the OBD-II scanner to the vehicle’s diagnostic port (usually located under the dashboard).
  - Turn on the ignition (without starting the engine) and read the codes.
  - Note any codes that appear, especially those related to the engine, throttle, or transmission.
Inspect the Throttle Body:
- Tools Required: Screwdriver set, cleaning supplies (throttle body cleaner), flashlight
- Instructions:
  - Locate the throttle body (attached to the intake manifold).
  - Inspect for carbon buildup or obstructions.
  - If dirty, clean the throttle body using throttle body cleaner.
  - Reassemble and test drive the vehicle.
Check the Air Intake System:
- Tools Required: Screwdriver set, vacuum gauge, flashlight
- Instructions:
  - Inspect the air filter for clogs or excessive dirt. Replace if necessary.
  - Check the intake hoses for cracks or leaks, which could lead to unmetered air entering the engine.
  - Use a vacuum gauge to check for proper vacuum at the manifold.
Inspect Fuel System:
- Tools Required: Fuel pressure gauge, wrench set
- Instructions:
  - Connect the fuel pressure gauge to the fuel rail.
  - Turn the ignition to the "on" position without starting the engine to check for fuel pressure.
  - Compare the reading to manufacturer specifications (typically around 50-60 psi for the Explorer).
  - If pressure is low, inspect the fuel pump, fuel filter, and fuel injectors for issues.
Check for Exhaust Restrictions:
- Tools Required: Vacuum gauge, exhaust backpressure gauge (optional)
- Instructions:
  - Use a vacuum gauge to measure the backpressure in the exhaust.
  - If backpressure is high (more than 1.5 psi at idle), inspect for clogged catalytic converters or exhaust system restrictions.
  - Perform a visual inspection of the exhaust system for damage or blockage.
Inspect Spark Plugs and Ignition System:
- Tools Required: Spark plug socket, torque wrench, multimeter
- Instructions:
  - Remove and inspect the spark plugs for wear or fouling.
  - Use a multimeter to check the ignition coils for proper resistance; replace defective coils as necessary.
  - Reinstall or replace spark plugs to manufacturer specifications (typically around 13-15 ft-lbs).
Evaluate Transmission Performance:
- Tools Required: OBD-II scanner, transmission fluid dipstick (if applicable)
- Instructions:
  - Check for transmission-related DTCs using the OBD-II scanner.
  - If equipped with a dipstick, check the transmission fluid level and condition (should be bright red and not burnt).
  - If fluid is low or burnt, a transmission service may be required.

Repair Instructions:

Throttle Body Cleaning or Replacement:
- If the throttle body cleaning resolves the issue, no further action is needed.
- If replacement is necessary:
  - Disconnect the battery.
  - Remove the intake duct and electrical connectors.
  - Unscrew the throttle body and replace it with a new unit.
  - Reinstall components and reconnect the battery.
Fuel System Repairs:
- If the fuel filter is clogged, replace it by disconnecting the fuel lines and securing them safely.
- If the fuel pump is faulty, replace it by accessing the fuel tank, removing the pump assembly, and installing a new pump.
Exhaust System Repairs:
- If a clogged catalytic converter is confirmed, replace it with a new unit following proper safety and environmental regulations.
Ignition System Repairs:
- Replace faulty ignition coils and spark plugs as needed, ensuring proper torque specifications are followed.
Transmission Repairs:
- If the transmission fluid is low or burnt, perform a fluid change and inspect for leaks. If issues persist, professional transmission service may be required.

Final Steps:

After repairs, clear any DTCs and perform a test drive to ensure the issue is resolved.
Monitor vehicle performance during acceleration to confirm that power loss no longer occurs.

Important Note: If the problem persists after following these steps, it may be advisable to consult a professional technician or visit a Ford dealership for further diagnosis, as advanced issues may require specialized equipment or expertise.