Lincoln F4SZ-9B989-AA Potentiometer - Engine Throttle

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The Throttle Position Sensor (TPS) is located on the end of the throttle shaft on the throttle body. By monitoring the output voltage from the TPS, the PCM can determine fuel delivery based on throttle valve angle (driver demand). A broken or loose TPS can cause intermittent bursts of fuel from the injectors and an unstable idle because the PCM thinks the throttle is moving. A problem with the TPS circuits will set a diagnostic trouble code. Ensure the ignition key is in the OFF position. 2005 AND EARLIER MODELS: Remove the air filter housing duct at the throttle body. On 2005 models with 5.4L engines, the entire air cleaner must be removed. Remove the accelerator shield if it interferes. Disconnect the electrical connector from the TPS. Remove the screws that retain the TPS to the throttle body and remove the TPS. Installation is the reverse of removal. Tighten the TPS mounting screws securely. 2006 AND LATER MODELS: Disconnect the crankcase vent tube from the air cleaner. Remove the air cleaner. Remove the four bolts and the pedestal that locates the air cleaner outlet pipe over the throttle body. Disconnect the connector at the TPS. The TPS on these models is attached to the throttle body with adhesive on the screws. Use a heat gun (no more than 1,100 watts) for three minutes at a distance of 1 inch from the sensor. If you have access to a hand-held infrared temperature reader, stop using the heat gun when the screw area reaches 130 degrees F. Use hand tools to remove the screws. On later models with adhesive screws, the TPS and the screws cannot be reused. They must be replaced. Align the plastic tab on the new TPS with the notch or hole at the throttle body, then install the screws to 27 in-lbs. The remainder of the installation is the reverse of removal.

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