how to solve the problem of BMW 318i stalling after starting
(1) Fault symptoms The chassis model of this car is E46, equipped with an M43 engine. The fault
symptoms are as follows: After starting the engine, the engine shakes seriously and cannot keep
running.
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(2) Diagnosis and maintenance: Connect the diagnostic instrument for self-diagnosis. The engine
system has multiple fault codes, but the information of these fault codes is not directly related to the
fault symptoms. Cleared the fault code and tried driving, but the fault persisted. Query the fault
information again and there is no fault code. Removed the spark plug and found that there was a lot of
carbon deposits on the electrode. Replaced 4 spark plugs, problem still persists. Measure the fuel
pressure and it can reach 380kPa at startup, which is normal. Unplug the wiring harness plug of the
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injector and connect the test light. The test light flashes when starting, indicating that the control The
line is good. After removing the four fuel injectors, it was found that they were all seriously clogged
and had cotton-like debris inside. Remove the fuel filter and find that the internal filter element has
been broken, indicating that the cotton-like debris is formed by the broken paper filter element. After
replacing the fuel filter, cleaning the fuel lines and injectors, and testing the car, the fault was alleviated.
However, as the engine temperature increased, the jitter symptoms became more and more serious,
and
the three-way catalytic converter burned dark red. After replacing 4 injectors, the engine would not
start. The cylinder pressure was measured and the results showed that the cylinder pressure of 2
cylinders was seriously insufficient. Remove the cylinder head, remove carbon deposits, grind the
valves, reassemble and test run to completely eliminate the fault.
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(3) Summary: The car has been driving at low speed in the city for a long time, and the engine cannot
reach the self-cleaning temperature, forming a large amount of carbon deposits. In addition, the fuel
filter is not replaced regularly, the filter element is broken, causing pipeline pollution, and the fuel
injector is scrapped. This illustrates the importance of proper vehicle use and regular
