2003 Ford ZX2 AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Emission Control: Notes

WARNING: This page is about a different car, the 2003 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Do not remove any part of the engine emission control system. Operating the engine without the engine emission control system will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.

The engine emission control consists of the:

  • positive crankcase ventilation (PCV) system.
  • exhaust gas recirculation (EGR) system module.

The Vehicle Emission Control Information (VECI) decal shows:

  • the components of the emission control system.
  • the correct vacuum hose routing.

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The PCV system uses intake manifold vacuum to ventilate the crankcase and return the fumes to the intake manifold for combustion.

The PCV valve (3.0L only):

  • controls the amount of ventilating air and blow-by gases going to the intake manifold.
  • prevents a backfire from reaching the crankcase.
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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.