why does my Ford Explorer make a hissing noise when I accelerate

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

591 words

Problem Statement

Learn how to diagnose and fix the hissing noise during acceleration in Ford Explorer. Step-by-step guide with diagnostic procedures 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 opening the air intake or exhaust systems.

Symptoms

•Hissing noise during acceleration
•Possible loss of power or sluggish acceleration
•Engine hesitation or rough running
•Increased fuel consumption
•Check engine light may be illuminated

Diagnostic Steps

1
Inspect the air intake system for any leaks or damage, including hoses and connections.
2
Check for vacuum leaks by listening for hissing sounds around the engine bay with the engine running.
3
Scan the vehicle's computer for any error codes using an OBD-II scanner.
4
Inspect the throttle body for carbon buildup or obstructions.
5
Examine the exhaust system for leaks, particularly at the manifold or any joints.
6
Verify the operation of the mass airflow sensor (MAF) and throttle position sensor (TPS).

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
•Screwdrivers
•Flashlight
•Smoke machine (optional)
•Multimeter
•Jack and jack stands

Parts Required

•Replacement air intake hoses
•Vacuum lines (if damaged)
•Mass airflow sensor (if faulty)
•Throttle position sensor (if faulty)

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Diagnostic Steps

1
Inspect the air intake system for any leaks or damage, including hoses and connections.
2
Check for vacuum leaks by listening for hissing sounds around the engine bay with the engine running.
3
Scan the vehicle's computer for any error codes using an OBD-II scanner.
4
Inspect the throttle body for carbon buildup or obstructions.
5
Examine the exhaust system for leaks, particularly at the manifold or any joints.
6
Verify the operation of the mass airflow sensor (MAF) and throttle position sensor (TPS).

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Repair Air Intake

Tools Required: Socket set, screwdrivers, flashlight
Sub-steps:
1. Remove the engine cover if applicable.
2. Check all intake hoses and connections for cracks or loose fittings.
3. Replace any damaged hoses with new ones (ensure they meet OEM specifications).
4. Reassemble the air intake system and secure all connections.

3. Check for Vacuum Leaks

Tools Required: Smoke machine (if available), or use carburetor cleaner
Sub-steps:
1. If using a smoke machine, introduce smoke into the intake system and observe for any escaping smoke indicating a leak.
2. Alternatively, with the engine running, spray carburetor cleaner around vacuum lines and listen for changes in engine RPM, which indicates a leak.
3. Replace any identified faulty vacuum lines.

4. Inspect Exhaust System

Tools Required: Jack and jack stands, exhaust wrench set
Sub-steps:
1. Raise the vehicle and secure it on jack stands.
2. Visually inspect the exhaust manifold, catalytic converter, and all joints for any signs of leaks or corrosion.
3. Tighten loose connections or replace any damaged components as necessary.
4. Lower the vehicle back to the ground.

5. Verify Sensor Functionality

Tools Required: Multimeter
Sub-steps:
1. Disconnect the MAF and TPS connectors.
2. Using a multimeter, check the resistance and voltage output of each sensor according to manufacturer specifications.
3. Replace any sensors that are out of specifications.