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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 66 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (4.6L))IDLE CONTROL SYSTEM
1991 Mercury Tracer Base, 4D Sedan, Automatic

Idle Control System

1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Idle Control System
WARNING: This page is about a different car, the 1994 Mercury Grand Marquis, 1994 Lincoln Town Car, 1994 Lincoln Mark VIII, and 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Faults in idle control system or circuit should set a diagnostic trouble code. See QUICK TEST in the appropriate TESTS W/CODES - EEC-IV (4.6L) article in the ENGINE PERFORMANCE section. If diagnostic trouble code has not been set, see CIRCUIT TEST KE in TESTS W/CODES - EEC-IV (4.6L) article in the ENGINE PERFORMANCE section for testing.

RENDER: 1.0x

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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.