Actually I am not sure. i think the PCM calculates the RPM according to the CKP sensor's input, so if the RPM is not correct, it might be the sensor's problem, esp the car is old.

rolia123 (123)
2001-12-13 -04:00
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Back To Topic: 请教各位DX,以前在 highway 上以 110KM/HOUR 左右的速度行驶时,发动机转速一般都是在 2500 RPM,可是从昨天起同样速度变成了2000 RPM,没有其他异常现象。不知道是不是故障的前兆?

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