Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1999TRACER LS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 1606 (ENGINE CONTROLS - DESCRIPTION AND OPERATION (EXCEPT DIESEL & HYBRID))INTAKE AIR SYSTEMSFEATURES OF THE THROTTLE BODY ASSEMBLY INCLUDE
1999 Mercury Tracer LS, 4D Sedan, Standard
Features of the Throttle Body Assembly include
1999 Mercury Tracer LS, 4D Sedan, StandardSECTION Features of the Throttle Body Assembly include
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. However, it is still accessible from the selected car via links, so may be relevant.
- IAC valve assembly mounted directly to the throttle body assembly (some vehicles).
- A preset stop to locate the WOT position.
- An air supply channel upstream of the throttle plate to provide fresh air to the PCV system (some vehicles only).
- Individual vacuum taps for PCV, EGR, EVAP and miscellaneous control signals (some vehicles only).
- PCV air return (if applicable).
- A throttle body-mounted TP sensor.
- A sealant/coating on the throttle bore and throttle plate makes the throttle body airflow tolerant to engine intake sludge accumulation. These throttle body assemblies must not be cleaned and have a white/black attention decal advising not to clean.
- A non-adjustable stop screw for close plate idle airflow.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.