How to deal with the problem of difficult starting of BMW 318i

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The difficulty in starting your BMW 318i, particularly after the vehicle has been parked for an extended period, may be attributed to excessive carbon deposits on the intake valve. The diagnosis and maintenance steps outlined in your provided information are quite detailed, but here’s a summarized guide:

Fault Symptoms:

* Starter needs multiple attempts before the engine runs, especially after long parking periods.
* Immediate starting after turning off the engine requires only one start.

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Diagnosis and Maintenance:

1. Confirmation of Symptoms:
* Verify the fault symptoms by starting the engine after parking for 10 minutes.

2. Self-Diagnosis with Diagnostic Tool:
* Use a diagnostic tool to check the engine system for fault information.
* Verify fuel pressure, ignition strength, and intake manifold sealing.
* Check cylinder pressure, ensuring it’s normal.

3. Observation of Engine Operating Data:
* Intake valve lift is noted to be 9.58mm, close to the maximum control volume.
* Intake manifold pressure is significantly lower than atmospheric pressure, indicating emergency mode activation.

4. Analysis of Emergency Mode Activation:
* During starting, the intake valve lift drops rapidly from 1.48mm to 0.30mm, causing engine shaking and stalling.
* Restarting results in a similar drop but eventually rises to 9.58mm, and the engine starts.

5. Identification of Carbon Deposits as the Issue:
* Excessive carbon deposits on the intake valve hinder the intended lift, resulting in insufficient air intake and engine stalling.

6. Verification and Cleaning:
* Clear the learning value of the engine control module.
* Start the engine, and if the intake valve lift remains stable, it confirms the carbon deposit issue.
* Use a carbon removal agent to clean the air intake system.

7. Post-Cleaning Steps:
* After cleaning, initialize the electronic valve control system.
* Conduct a test drive to ensure the fault symptoms have disappeared.

Summary:

* Root Cause: Excessive carbon deposits on the intake valve.
* Effect: Reduced intake valve lift, leading to starting difficulties and engine stalling.
* Solution: Carbon removal agent used to clean the air intake system.
* Verification: Learning value cleared, stable intake valve lift, and successful test drive.

Additional Notes:

* Regular maintenance may help prevent carbon deposits.
* Consider checking the air filter, PCV system, and fuel injectors for overall engine health.

Always follow safety protocols and ensure you have the necessary tools and expertise to perform these maintenance tasks. If you’re unsure or uncomfortable, consulting with a professional mechanic is recommended.

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