my Ford Explorer Fifth Generation (2011-2019) won't accelerate past 30 mph, what should I check?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

592 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 engine performance issues in Ford Explorer 2011-2019. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

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 fuel system or transmission

Symptoms

•Check engine light illuminated
•Engine stalling during acceleration
•Rough idle or misfiring
•Unusual noises from the engine
•Decreased fuel efficiency
•Transmission slipping or harsh shifting

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored diagnostic trouble codes (DTCs)
2
Check the throttle position sensor (TPS) for proper operation and alignment
3
Inspect the air intake system for restrictions or leaks, including the air filter and intake hoses
4
Test the fuel pressure using a fuel pressure gauge to ensure adequate fuel delivery
5
Examine the transmission fluid level and condition, looking for signs of contamination or burning
6
Inspect for vacuum leaks in hoses or connections that could affect engine 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
•Socket set
•Multimeter
•Fuel pressure gauge
•Transmission dipstick or fluid level gauge

Parts Required

•Throttle Position Sensor (if found faulty)
•Transmission fluid (if needed)
•Fuel filter (if applicable)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored diagnostic trouble codes (DTCs)
2
Check the throttle position sensor (TPS) for proper operation and alignment
3
Inspect the air intake system for restrictions or leaks, including the air filter and intake hoses
4
Test the fuel pressure using a fuel pressure gauge to ensure adequate fuel delivery
5
Examine the transmission fluid level and condition, looking for signs of contamination or burning
6
Inspect for vacuum leaks in hoses or connections that could affect engine performance

Solution

1. Preparation

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

2. Scan for Codes

Use the OBD-II scanner to read and clear any trouble codes.
Note any codes related to the engine, transmission, or throttle control.

3. Inspect and Replace Throttle Position Sensor (if necessary)

Tools Required: Socket set, multimeter
Locate the TPS on the throttle body.
Disconnect the electrical connector from the TPS.
Use a multimeter to test the TPS for proper voltage and resistance.
If faulty, remove the TPS using a socket set, and replace it with a new one.
Reconnect the electrical connector and clear any error codes.

4. Check Fuel System

Tools Required: Fuel pressure gauge
Locate the fuel rail and connect the fuel pressure gauge.
Turn the ignition to the "On" position without starting the engine.
Check the fuel pressure reading against manufacturer specifications.
If low, inspect the fuel pump, filter, and lines for blockages or failures.

5. Inspect Transmission Fluid

Tools Required: Transmission dipstick or fluid level gauge
With the engine running, check the transmission fluid level using the dipstick.
If low, top off with the recommended transmission fluid.
If the fluid is discolored or has a burnt smell, consider a transmission fluid flush and filter replacement.

6. Test Drive and Monitor

Reconnect the battery and start the vehicle.
Take the vehicle for a test drive to check for improvements in acceleration.
Monitor for any re-illuminated check engine lights or unusual behaviors.