Traditional Culture Encyclopedia - The 24 Solar Terms - Bmw E90, the third series, has been idling recently, and the tachometer is unstable from 800 to 600. What happened? I changed the oil.
Bmw E90, the third series, has been idling recently, and the tachometer is unstable from 800 to 600. What happened? I changed the oil.
The possible reasons are as follows
Too much carbon deposit on throttle, fuel injector and air intake.
There is too much carbon in the engine, and the gasoline sprayed from the nozzle will
Due to being absorbed by carbon deposits, the mixture becomes thinner during cold start, resulting in
Jitter.
The ignition coil, spark plug and fuel nozzle are faulty, and the cylinder is missing.
Low oil pressure, low cylinder pressure and insufficient power.
Air leakage in the intake manifold.
Idle speed control valve is damaged or dirty.
Engine foot pad is damaged or bolts are loose.
Oil oxidation, or low grade, poor low-temperature fluidity, guarantee
Protection is not in place.
Fuel is not good.
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