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Autopapyrus · Ford Fiesta 1.4 Duratec (2012)
https://autopapyrus.com/guides/ford/fiesta/throttle-body-cleaning/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Ford Fiesta 1.4 Duratec (2012): Throttle Body Cleaning

The Fiesta VI with the 1.4 Duratec has an electronically controlled throttle body (no throttle cable). Carbon buildup and oily deposits around the edge of the throttle plate cause an unstable idle, hesitation when you release the pedal, and sometimes a throttle fault code. Cleaning is simple, but you must never force the electronic actuator to turn.

Difficulty: Medium Time: 40-60 minutes Steps: 11 Tools: socket set and ratchet with extension, screwdriver, Torx set (check the fastener type on your throttle body), throttle body cleaner or carburetor cleaner, clean lint-free rags, soft brush, new throttle body gasket (O-ring), new hose clamp if needed.

Part

  • 🔩 throttle body gasket (O-ring) for 1.4 Duratec (exact OE number not given here to avoid errors). Throttle body cleaner
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Step by step

11 steps
  1. Shut off the engine and let it cool down. Disconnect the negative battery terminal and wait 5-10 minutes. After that, do not press the accelerator pedal.
  2. Locate the throttle body. It sits on the intake manifold, and the corrugated air duct from the air filter housing connects to it. Wipe the area around the throttle body to remove dust so dirt does not get into the intake.
  3. Loosen the clamp and remove the air duct from the throttle body. If thin crankcase ventilation or evaporative (charcoal canister) hoses are in the way, carefully disconnect them and note where each one goes.
  4. Press the locking tab and disconnect the throttle body electrical connector. Pull on the connector housing, not the wires.
  5. Remove the throttle body mounting bolts (usually 3-4, socket type depends on trim and version) and take the throttle body off. Remove the old gasket or O-ring and wipe the mating surface on the manifold. Cover the manifold opening with a clean rag so nothing falls inside.
  6. Treat the throttle plate and the bore of the housing with cleaner. Let it soak for 1-2 minutes, then wipe with a rag and a soft brush. Clean the edge of the plate and the area around it especially well, where carbon usually collects. Do not use abrasives or sharp objects.
  7. You may open the throttle plate slightly, by finger only and without force, just enough to wipe the edge. Opening it abruptly or forcefully will damage the plastic actuator gear. Do not spray cleaner onto the electrical part or connector, and if the throttle body is removed, do not let liquid get into the motor.
  8. Let the throttle body dry completely for 5-10 minutes. Install the new gasket and fit the throttle body back in place. Tighten the bolts evenly in a crisscross pattern with moderate force. These are small bolts in an aluminum manifold, so do not overtighten. The torque is typically about 8-12 N·m (6-9 lb-ft), but check it against the manufacturer's specification.
  9. Reconnect the connector, install the air duct, tighten the clamp and refit the ventilation hoses. Check that there are no air leaks anywhere.
  10. Reconnect the battery terminal. Turn the ignition on for 10-15 seconds without starting the engine, then start it. The idle may be slightly unstable at first while the control unit relearns the throttle plate position. Let the engine idle for 5-10 minutes until it warms up.
  11. If the idle still hunts and the malfunction indicator lamp is on, the car needs a scan tool diagnosis and possibly a throttle adaptation procedure. Diagnostic equipment may be needed to reset and force the relearn.

Common mistakes and warnings

  • Do not turn the throttle plate by force and do not hold it with a screwdriver: worn or broken actuator gears will require replacing the entire throttle body. Do not leave cleaner standing on the throttle plate, as it can get into the cylinders and sensors. If the engine stalls after cleaning or the warning lamp stays on, take the car to a repair shop for diagnosis.