my Ford Explorer has a hard time starting when it's cold what should I check

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

601 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 cold start issues in Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems
•Allow engine to cool before working on coolant systems

Symptoms

•Check engine light illuminated
•Engine cranks slowly or not at all
•Rough or unstable idle after starting
•Increased exhaust smoke upon starting
•Extended cranking time before the engine starts
•Battery warning light illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any diagnostic trouble codes (DTCs)
2
Measure battery voltage and load test the battery to ensure it’s providing adequate power
3
Inspect battery terminals and cables for corrosion or loose connections
4
Check the starter motor operation by testing voltage at the starter during cranking
5
Verify fuel pressure using a fuel pressure gauge to ensure the fuel pump is functioning properly
6
Inspect the engine coolant temperature sensor for malfunction, as it can affect cold start 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
•Multimeter
•Fuel pressure gauge
•Socket set
•Torque wrench
•Wire brush

Parts Required

•Battery (if faulty)
•Starter motor (if faulty)
•Fuel filter (if clogged)
•Coolant temperature sensor (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any diagnostic trouble codes (DTCs)
2
Measure battery voltage and load test the battery to ensure it’s providing adequate power
3
Inspect battery terminals and cables for corrosion or loose connections
4
Check the starter motor operation by testing voltage at the starter during cranking
5
Verify fuel pressure using a fuel pressure gauge to ensure the fuel pump is functioning properly
6
Inspect the engine coolant temperature sensor for malfunction, as it can affect cold start performance

Solution

1. Preparation

Gather all tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and the engine is off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Battery Inspection and Replacement

Inspect Battery:
- Remove the battery from the vehicle if it is faulty or weak.
- Clean terminals with a wire brush and baking soda solution if corroded.
Replace Battery (if necessary):
- Install a new battery of compatible type and specifications.
- Tighten terminal connections to manufacturer specifications (typically 12-15 ft-lbs).

3. Starter Motor Testing and Replacement

Test Starter Motor:
- Reconnect the battery and use a multimeter to check voltage at the starter during cranking.
- If voltage is present but the starter does not engage, consider replacement.
Replace Starter (if necessary):
- Remove starter motor by disconnecting electrical connections and unbolting from the engine/transmission.
- Install the new starter and secure it with appropriate torque (typically 30-35 ft-lbs).

4. Fuel System Inspection

Check Fuel Pressure:
- Connect a fuel pressure gauge to the fuel rail.
- Turn the ignition to the "on" position (do not start) and check for proper fuel pressure; refer to service manual for specifications (usually around 30-50 psi).
Replace Fuel Filter (if needed):
- If pressure is low, replace the fuel filter as per service manual instructions.

5. Coolant Temperature Sensor Inspection

Test Sensor Operation:
- Disconnect the coolant temperature sensor and check resistance with a multimeter; compare readings to specifications in the repair manual.
Replace Sensor (if necessary):
- Remove the old sensor and install a new one.
- Reconnect the wiring harness and check for proper function.