Question about 1992 Subaru Legacy

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Lost power uphill

Lost power and died coming up 1 mile incline, like running out of gas. I have over 1/2 tank of fuel. Afterwards she ran fine. What might this be?

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  • rswindoll Apr 12, 2009

    What is a knock sensor? Where is it and how do we replace it?

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Check your knock sensor. When these go bad it retards the engine timing causing the car to lose power. This is a common problem on these cars. I would also recommend changing the fuel filter.

Posted on Apr 12, 2009

  • StrollerMama Apr 13, 2009

    The knock sensor is a sensor that basically monitors the vibration of the engine. What it does is retards the timing to prevent engine damage if say the car is knocking or pinging. The knock sensor is located on the top left side of the cylinder block. To remove and re-install follow these steps:
    1. Disconnect the negative battery cable.
    2. Disconnect the Knock Sensor wire harness.
    3. Loosen and remove the sensor retainer bolt, then remove the sensor.
    4. Put in new sensor, replace retainer bolt and reconnect the knock sensor wire harness. Make sure every thing is tight.
    5. Replace battery cable.

    The knock sensor runs about $90.00 from a parts store specializing in first run parts. You may get it cheaper at places like Advance Auto.



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