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How do you install a throttle position sensor in a 1992 legacy wagon

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Take out screws or bolts unplug it and reverse method upon installation! do you even know its location?

Posted on Dec 23, 2008

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It is underneath the intake manifold. If you look straight down from the throttle body, you will see a sensor with one wire coming out and a bolt going through the middle of it, that is the knock sensor.

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Weak throttle response 92 subaru legacy


I would have have the TPS (Throttle Position Switch) tested, it sends a signal to the ECM of where the position of the throttle is so the ECM can determine how much fuel and air and spark to give to the engine. Have you replaced the spark plugs, fuel filter, air filter, spark plug wires? Have the coil tested also to see if it is putting out enough spark. Do you have any Check Engine Light coming on?

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Throttle position switch. how much for the part? is it easy to repllace?


This sensor sends the ECU an output signal which corresponds to the opening of the throttle valve. Using this output signal, the ECU precisely controls the air/fuel ratio during acceleration, deceleration and idling. The TP sensor and the throttle switch are combined as part of an assembly. The switch signal turns ON only when the throttle is opened to the idle position or at Wide Open Throttle (WOT) acceleration.

REMOVAL & INSTALLATION
( see Figures 2, 3, 4 and 5 )


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Fig. 2: Disconnect the wire harness from the throttle position sensor-Legacy

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Fig. 3: Paint a matchmark on the sensor and throttle body for ease of installation and adjustment

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Fig. 4: Remove the sensor retainer screws

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Fig. 5: Lift off the throttle position sensor
  1. Disconnect the negative battery cable.
  2. Disconnect the throttle sensor electrical harness.
  3. Place a matchmark on the throttle position sensor and throttle body mounting surface, so that during installation, the sensor can be properly aligned.
  4. Remove the 2 screws securing the throttle sensor to the throttle body assembly.
  5. Remove the throttle sensor by pulling it in the axial direction of the throttle shaft.
  6. Remove the throttle sensor O-ring and discard.
To install:
  1. Using a new throttle O-ring, install the throttle sensor, aligning the matchmarks. Install and hand-tighten the retainer screw.
  2. Connect the throttle sensor electrical harness.
  3. Connect the negative battery cable.

Hope this help (remember rated and comment this). Good luck.

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Jan 14, 2010 | 1992 Subaru Legacy

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