Mustang GT V8-4.6L SOHC VIN X (1998)
Throttle Body: Description and Operation
The throttle body functions as follows:
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The throttle body controls airflow to the engine.
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A cam lever and accelerator cable rotates the throttle shaft from idle to Wide Open Throttle (WOT) position.
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The plate position at idle is factory set by the lever contacting a throttle return control screw. The head of the throttle return control screw is
removed to make the idle plate set permanent. Do not attempt to adjust idle/minimum plate setting with the throttle return control screw.
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Throttle body idle airflow provides minimum engine airflow, while the Idle Air Control valve (IAC valve) provides supplemental engine airflow
to maintain the desired engine idle speed.
Other features of the throttle body include:
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the wide open throttle plate position, which is obtained when the lever contacts the throttle body casting
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Throttle Position sensor (TP sensor), which provides an electrical signal used as an input to the Powertrain Control Module (PCM)
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a sealant applied to the downstream side of the throttle body plate and bore to reduce plate-to-bore leakage.
NOTE: Cleaning may remove sealant. Do not clean.
