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N54 Engine: Diagnosis Of Cold Start Rough Running With Misfire Faults (13 04 09)
Reference number: 13 04 09
N54 ENGINE: DIAGNOSIS OF COLD START ROUGH RUNNING WITH MISFIRE FAULTS
TECHNICAL SERVICE BULLETIN
| BMW: | F01; F02; E82; E88; E89; E90; E92; E93; E60; E61; E71 |
| GROUP: | Fuel Systems |
SERVICE INFORMATION
SUBJECT
N54 Engine: Diagnosis of Cold Start Rough Running with Misfire Faults
SITUATION
The customer may complain that during the cold start in the morning, the engine runs very roughly and the Service Engine Soon lamp is illuminated.
Various misfire fault codes (e.g., 29CC, 29D2, 29D1, 29D0, 29C0, 29CF) may be stored in the DME control module.
The engine rough running complaint can be reproduced on a cold start in the workshop. During the course of diagnosis, the spark plugs, removed from the misfiring cylinders after the problem was reproduced, are found to be soaked ("wet") with fuel, while the injector tips are covered with a layer of carbon deposit.
CAUSE
Possible cause: high-pressure injector failure (leakage or incorrect spraying pattern) due to internal wear or unfavorable stock of tolerances
CORRECTION
In the case of reproducible "cold start" rough engine running with corresponding misfire faults, replace all three high-pressure injectors on the bank that is faulted (1-3 or 4-6) using improved P/N 13 53 8 616 079 with index 11 or higher.
For example, if the engine has a misfire on cylinder 1, replace injectors for cylinders 1-3 if those injectors are not already index 11 or higher.
If the injectors on that bank are already index 11 or higher, only replace the injector on the faulty cylinder.
Use P/N 13 53 8 616 079 when replacing the injector(s).
Follow Repair Instruction 13 53 310 for injector removal and installation. Additionally, the spark plugs from the misfiring cylinders which were found to be soaked ("wet") with fuel should be replaced.
After injector replacement, perform the individual injector calibration (adjustment) with the DME control module, per SI B12 26 08 .
See the photo below to properly identify the index number.
Additional Information:
As of January 2013, an improved injector is available. Two distinct markings on the injector itself will identify the improved injector:
1 = Internal material improvement
2 = 7585261 - (index) 11 or greater
Due to this difference, the injectors with index 11 and higher and injectors with index 10 and lower cannot be mixed on the same engine bank (i.e., cylinders 1-3 or 4-6).
Once a bank of injectors is at index 11 or higher, the "bank set replacement" requirement no longer applies. For index 11 injector failures, only replace the failed injector.
Use the DCS Warranty Vehicle Inquiry: See the Repair History (Claims) section to review the prior injector repairs, if applicable. Click on the "Claim Number" to review each claimed defect code and its corresponding line item details (labor, parts and sublet).
IMPORTANT NOTE:
For N54 misfire fault complaints during normal engine operation (misfire faults not related to the engine's "cold start"), refer to the following Service Information bulletins:
- B12 05 09 - N54 (E6x) Misfire Faults Due to DME Software Error
- B12 06 09 - N54 (E9x) Misfire Faults Due to DME Software Error
PARTS INFORMATION
| Part Number | Description | Quantity |
|---|---|---|
| 13 53 8 616 079 | High-pressure injector (this part number is index 11 or greater) | As required, up to 6 |
WARRANTY INFORMATION
Not applicable.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.