Engine Controls - Service & Adjustment Specifications: Other Lincoln Aviator I

Gasoline Engines

Note. DO NOT use ignition switch to crank engine. Fuel injection and coils will activate and may cause damage.

Check engine compression with engine at normal operating temperature, all spark plugs removed (on dual plugs, remove exhaust side only), and throttle wide open. Ensure crankcase is full and oil is of correct viscosity. With compression gauge installed, use remote starter switch to crank engine.

Crank engine at least 5 revolutions, and record highest reading. Repeat procedure for all cylinders, using approximately same number of revolutions. Lowest compression reading should not be less than 75 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ).

VALVE CLEARANCE

Note. All models are equipped with hydraulic valve lifters; valve adjustment is not required. If valves are noisy or incorrect clearance is suspected, worn components are indicated. Check collapsed valve lifter clearance. See appropriate article in ENGINES.

HIGH TENSION WIRE RESISTANCE

On all models, high tension wire resistance should be no more than 7000 ohms per foot.

SPARK PLUGS

Note. See vehicle underhood emissions information decal for spark plug gap specification.

Note. If reusing originally installed spark plugs, reinstall them in original position. Some cylinders use platinum ground electrodes and some cylinders use platinum positive electrodes. Replacement platinum spark plugs are double platinum electrode spark plugs and are used for all cylinders.

FIRING ORDER & TIMING MARKS

Note. Use illustrations for firing order and timing marks. (Scheme 1)and (Scheme 3). Timing mark information is not available for all models.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

IGNITION TIMING

Note. On all models with distributorless electronic ignition, manufacturer does not recommend checking ignition timing, as faulty readings are common and timing is not adjustable.

BASE IGNITION TIMING

FUEL INJECTORS

FUEL INJECTOR RESISTANCE

FUEL PUMP

Note. Fuel pump performance is a measurement of fuel pressure and volume availability, not regulated fuel pressure.

Note. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS .

IDLE MIXTURE & SPEED

Note. Idle mixture speed are not adjustable. For additional information, see THEORY & OPERATION - CNG, FLEX-FUEL & GASOLINE article.

THROTTLE POSITION SENSOR

Note. Throttle Position (TP) sensor is not serviceable. TP sensor may also be referred to as Accelerator Pedal (AP) sensor. If TP sensor service is required, see TEST DH: THROTTLE POSITION SENSOR in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

TP SENSOR OUTPUT