{"nhtsa_id":10149429,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-26","date":"2013-02-01","document_id":"130409","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"\"N54 - Diagnosis of Cold Start Rough Running with Misfire Faults. 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. Possible cause: high-pressure injector failure (leakage or incorrect spraying pattern) due to internal wear or unfavorable stock of tolerances IMPORTANT: For comprehensive N54 drivability diagnostics, always refer to the \"\"N54 Engine Diagnostic Fault Tree\"\" file (the current version \"\"02_14_13\"\" is found as a PDF attachment to SI B12 55 06).\"","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10149429-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10149429-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10149429","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"BMW","model":"135I","year_from":2008,"year_to":2009,"match":"exact","vehicle_ids":["2008_bmw_135i","2009_bmw_135i"]},{"make":"BMW","model":"135I COUPE","year_from":2007,"year_to":2007,"match":null,"vehicle_ids":[]},{"make":"BMW","model":"335","year_from":2007,"year_to":2009,"match":null,"vehicle_ids":[]},{"make":"BMW","model":"335I","year_from":2007,"year_to":2009,"match":"exact","vehicle_ids":["2007_bmw_335i","2008_bmw_335i","2009_bmw_335i"]},{"make":"BMW","model":"335XI","year_from":2007,"year_to":2008,"match":"exact","vehicle_ids":["2007_bmw_335xi","2008_bmw_335xi"]},{"make":"BMW","model":"335XI","year_from":2009,"year_to":2009,"match":null,"vehicle_ids":[]},{"make":"BMW","model":"535I","year_from":2008,"year_to":2009,"match":"exact","vehicle_ids":["2008_bmw_535i","2009_bmw_535i"]},{"make":"BMW","model":"Z4","year_from":2009,"year_to":2009,"match":"exact","vehicle_ids":["2009_bmw_z4"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}