how to fix my BMW 5 Series F10/F11 (2010-2017) when the engine cranks but won’t start

BMW 5 Series F10/F11 (2010-2017)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

569 words

Problem Statement

The BMW 5 Series F10/F11 (2010-2017) is experiencing an issue where the engine cranks but does not start, indicating potential problems with fuel delivery, ignition, or other crit

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits.
•Allow the engine to cool before inspecting or working on engine components.

Symptoms

•Engine cranks but does not start
•No sounds of fuel pump activation
•Check engine light illuminated
•Possible rough or inconsistent cranking speed
•Fuel gauge indicates sufficient fuel level

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
2
Verify fuel pump operation by listening for activation when the ignition is turned on.
3
Check fuel pressure at the fuel rail using a fuel pressure gauge.
4
Inspect the battery voltage and connections to ensure adequate power to the starter and fuel system.
5
Test the ignition system components, including spark plugs and ignition coils.
6
Inspect fuses and relays related to the fuel and ignition systems.

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

•Steps:**
•Locate the fuel pressure test port on the fuel rail.
•Connect the fuel pressure gauge to the test port.
•If pressure is low, replace the fuel pump.

Parts Required

•Fuel pump (if needed)
•Ignition coils (if faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any diagnostic trouble codes (DTCs).
2
Verify fuel pump operation by listening for activation when the ignition is turned on.
3
Check fuel pressure at the fuel rail using a fuel pressure gauge.
4
Inspect the battery voltage and connections to ensure adequate power to the starter and fuel system.
5
Test the ignition system components, including spark plugs and ignition coils.
6
Inspect fuses and relays related to the fuel and ignition systems.

Solution

1. Preparation

Gather necessary tools and parts before beginning repairs.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the negative battery terminal for safety.

2. Check Fuel Pump Functionality

Tools Required: Fuel pressure gauge
Steps:
1. Locate the fuel pressure test port on the fuel rail.
2. Connect the fuel pressure gauge to the test port.
3. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading. It should meet manufacturer specifications (typically around 50-60 psi for most BMWs).
4. If pressure is low, replace the fuel pump.

3. Inspect and Replace Ignition Components

Tools Required: Socket set, torque wrench
Steps:
1. Remove the engine cover to access the ignition coils.
2. Disconnect the electrical connectors from each ignition coil.
3. Remove the ignition coils using a socket set and inspect them for damage.
4. Replace any faulty ignition coils with new ones.
5. Reinstall the ignition coils and reconnect the electrical connectors.

4. Verify Battery and Electrical Connections

Tools Required: Multimeter
Steps:
1. Check the battery voltage using a multimeter; it should be above 12.4 volts.
2. Inspect the battery terminals for corrosion and tightness; clean and tighten as necessary.
3. If the voltage is low, charge or replace the battery as needed.

5. Reconnect Battery and Test Start

Reconnect the negative battery terminal.
Attempt to start the engine and observe if it now starts.