1991 1999 ford explorer chilton User Manual

Testing the spark plug wire resistance through the distributor cap with an ohmmeter
Remove the distributor cap from the distributor assembly.
1. 
Visually inspect the spark plug wires for burns, cuts or breaks in the insulation. Check the spark plug
boots and the nipples on the distributor cap and coil. Replace any damaged wiring.
2. 
Inspect the spark plug wires to insure that they are firmly seated on the distributor cap.
3. 
Disconnect the spark plug wire thought to be defective at the spark plug.
4....

Checking individual plug wire resistance with a digital ohmmeter
Never, under any circumstances, measure resistance by puncturing the spark plug wire.
If the measured resistance is less than 7000 ohms per foot of wire, the wire is good. If the measured
resistance is greater than 7000 ohms per foot, the wire is defective and should be replaced.
5. 
Distributor Cap and Rotor
1991-92 models with the 2.9L engine, and 1991-94 models with the 3.0L engine use a distributor
equipped ignition system. All other...

INSPECTION
Distributor Cap
Inspection points for the distributor cap-note the square alignment locator which limits the cap to one installation position
Wash the inside and outside surfaces of the cap with soap and water then dry it with compressed air.
1. 
Inspect the cap for cracks, broken or worn carbon button, or carbon tracks. Also inspect the cap
terminals for dirt and corrosion.
2. 
Replace the cap if any of the above conditions are observed.
3. 
Distributor Rotor
Inspection points for the...

Ignition Timing
No periodic checking or adjustment of the ignition timing is necessary for any of the vehicles covered by
this manual. However, the distributor ignition system used by the 1991-94 2.9L and 3.0L engines does
allow for both, should the distributor be removed and installed or otherwise disturbed.
GENERAL INFORMATION
Ignition timing is the measurement, in degrees of crankshaft rotation, of the point at which the spark plugs fire
in each of the cylinders. It is measured in degrees before or...

should be followed if they differ from the following.
The underhood VECI label is specific to YOUR truck and should be used if it differs from another source
This procedure should not be used as a periodic maintenance adjustment. Timing should only be set after the
distributor has been disturbed (removed and re-installed) in some way. If problems are encountered setting
the initial timing with this procedure and no mechanical causes are found, follow the spark timing advance
check procedure found later...

A remote starter must NOT be used to start the vehicle when setting the initial ignition timing.
Disconnecting the start wire at the starter relay will cause the ignition control module to revert to Start
Mode timing after the vehicle is started. Reconnecting the start wire after the vehicle is running WILL
NOT correct the timing.
Start the engine (using the ignition key and NOT a remote starter to assure timing will be set
correctly) and allow the engine to return to normal operating temperature.
9....

Air Conditioning System
SYSTEM SERVICE & REPAIR
It is recommended that the A/C system be serviced by an EPA Section 609 certified automotive
technician utilizing a refrigerant recovery/recycling machine.
The do-it-yourselfer should not service his/her own vehicles A/C system for many reasons, including legal
concerns, personal injury, environmental damage and cost.
According to the U.S. Clean Air Act, it is a federal crime to service or repair (involving the refrigerant) a
Motor Vehicle Air Conditioning...

The easiest and most important preventive maintenance for your A/C system is to be sure that it is
used on a regular basis. Running the system for five minutes each month (no matter what the season)
will help ensure that the seals and all internal components remain lubricated.
· 
Some vehicles automatically operate the A/C system compressor whenever the windshield defroster is
activated. Therefore, the A/C system would not need to be operated each month if the defroster was
used.
In order to prevent...

ELEMENT (REFILL) CARE & REPLACEMENT
For maximum effectiveness and longest element life, the windshield and wiper blades should be kept clean.
Dirt, tree sap, road tar and so on will cause streaking, smearing and blade deterioration if left on the glass. It is
advisable to wash the windshield carefully with a commercial glass cleaner at least once a month. Wipe off
the rubber blades with the wet rag afterwards. Do not attempt to move wipers across the windshield by hand;
damage to the motor and drive...

Choose a blade which will fit your vehicle, and that will be readily available next time you need
blades
When installed, be certain the blade is fully inserted into the backing
Tires and Wheels
Common sense and good driving habits will afford maximum tire life. Make sure that you dont overload the
vehicle or run with incorrect pressure in the tires. Either of these will increase tread wear. Fast starts, sudden
stops and sharp cornering are hard on tires and will shorten their useful life span.
For...