Dodge Dakota (R1). Manual — part 318
SPARK PLUG CABLE
DESCRIPTION
Spark plug cables are sometimes referred to as sec-
ondary ignition wires.
OPERATION
The spark plug cables transfer electrical current
from the ignition coil(s) and/or distributor, to individ-
ual spark plugs at each cylinder. The resistive spark
plug cables are of nonmetallic construction. The
cables provide suppression of radio frequency emis-
sions from the ignition system.
DIAGNOSIS AND TESTING - SPARK PLUG
CABLES
Check the spark plug cable connections for good
contact at the coil(s), distributor cap towers, and
spark plugs. Terminals should be fully seated. The
insulators should be in good condition and should fit
tightly on the coil, distributor and spark plugs. Spark
plug cables with insulators that are cracked or torn
must be replaced.
Clean high voltage ignition cables with a cloth
moistened with a non-flammable solvent. Wipe the
cables dry. Check for brittle or cracked insulation.
On 3.9L V-6 and 5.2/5.9L V-8 engines, spark plug
cable heat shields are pressed into the cylinder head
to surround each spark plug cable boot and spark
plug (Fig. 36). These shields protect the spark plug
boots from damage (due to intense engine heat gen-
erated by the exhaust manifolds) and should not be
removed. After the spark plug cable has been
installed, the lip of the cable boot should have a
small air gap to the top of the heat shield (Fig. 36).
TESTING
When testing secondary cables for damage with an
oscilloscope, follow the instructions of the equipment
manufacturer.
If an oscilloscope is not available, spark plug cables
may be tested as follows:
CAUTION: Do not leave any one spark plug cable
disconnected for longer than necessary during test-
ing. This may cause possible heat damage to the
catalytic converter. Total test time must not exceed
ten minutes.
With the engine running, remove spark plug cable
from spark plug (one at a time) and hold next to a
good engine ground. If the cable and spark plug are
in good condition, the engine rpm should drop and
the engine will run poorly. If engine rpm does not
drop, the cable and/or spark plug may not be operat-
ing properly and should be replaced. Also check
engine cylinder compression.
With the engine not running, connect one end of a
test probe to a good ground. Start the engine and run
the other end of the test probe along the entire
length of all spark plug cables. If cables are cracked
or punctured, there will be a noticeable spark jump
from the damaged area to the test probe. The cable
running from the ignition coil to the distributor cap
can be checked in the same manner. Cracked, dam-
aged or faulty cables should be replaced with resis-
tance type cable. This can be identified by the words
ELECTRONIC SUPPRESSION printed on the cable
jacket.
Use an ohmmeter to test for open circuits, exces-
sive resistance or loose terminals. If equipped,
remove the distributor cap from the distributor. Do
not remove cables from cap. Remove cable from
spark plug. Connect ohmmeter to spark plug termi-
nal end of cable and to corresponding electrode in
distributor cap. Resistance should be 250 to 1000
Ohms per inch of cable. If not, remove cable from dis-
tributor cap tower and connect ohmmeter to the ter-
minal ends of cable. If resistance is not within
specifications as found in the SPARK PLUG CABLE
RESISTANCE chart, replace the cable. Test all spark
plug cables in this manner.
SPARK PLUG CABLE RESISTANCE
MINIMUM
MAXIMUM
250 Ohms Per Inch
1000 Ohms Per Inch
3000 Ohms Per Foot
12,000 Ohms Per Foot
Fig. 36 Heat Shields—3.9/5.2/5.9L Engines
1 - AIR GAP
2 - SPARK PLUG BOOT HEAT SHIELD
8I - 20
IGNITION CONTROL
AN
To test ignition coil-to-distributor cap cable, do not
remove the cable from the cap. Connect ohmmeter to
rotor button (center contact) of distributor cap and
terminal at ignition coil end of cable. If resistance is
not within specifications as found in the Spark Plug
Cable Resistance chart, remove the cable from the
distributor cap. Connect the ohmmeter to the termi-
nal ends of the cable. If resistance is not within spec-
ifications
as
found
in
the
Spark
Plug
Cable
Resistance chart, replace the cable. Inspect the igni-
tion coil tower for cracks, burns or corrosion.
REMOVAL
CAUTION: When disconnecting a high voltage cable
from a spark plug or from the distributor cap, twist
the rubber boot slightly (1/2 turn) to break it loose
(Fig. 37). Grasp the boot (not the cable) and pull it
off with a steady, even force.
Install cables into the proper engine cylinder firing
order. Refer to Firing Order in Specifications.
INSTALLATION
Install cables into the proper engine cylinder firing
order. Refer to Firing Order in Specifications.
When replacing the spark plug and coil cables,
route the cables correctly and secure in the proper
retainers. Failure to route the cables properly can
cause the radio to reproduce ignition noise. It could
also cause cross ignition of the plugs or short circuit
the cables to ground.
When installing new cables, make sure a positive
connection is made. A snap should be felt when a
good connection is made between the plug cable and
the distributor cap tower.
Fig. 37 Cable Removal
1 - SPARK PLUG CABLE AND BOOT
2 - SPARK PLUG BOOT PULLER
3 - TWIST AND PULL
4 - SPARK PLUG
AN
IGNITION CONTROL
8I - 21
SPARK PLUG CABLE (Continued)
INSTRUMENT CLUSTER
TABLE OF CONTENTS
page
page
INSTRUMENT CLUSTER
INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . 6
ABS INDICATOR
AIRBAG INDICATOR
BRAKE/PARK BRAKE INDICATOR
CHECK GAUGES INDICATOR
COOLANT LOW INDICATOR
CRUISE INDICATOR
DOOR AJAR INDICATOR
ENGINE TEMPERATURE GAUGE
FUEL GAUGE
GEAR SELECTOR INDICATOR
HIGH BEAM INDICATOR
HIGH BEAM INDICATOR . . . . . . . . . . . . . . . . . 22
LOW FUEL INDICATOR
MALFUNCTION INDICATOR LAMP (MIL)
ODOMETER
OIL PRESSURE GAUGE
OVERDRIVE OFF INDICATOR
SEATBELT INDICATOR
SECURITY INDICATOR
SERVICE 4WD INDICATOR
SPEEDOMETER
TACHOMETER
TRANSMISSION TEMP INDICATOR
TURN SIGNAL INDICATOR
TURN SIGNAL INDICATOR. . . . . . . . . . . . . . . . 32
UPSHIFT INDICATOR
VOLTAGE GAUGE
WAIT-TO-START INDICATOR
WAIT-TO-START INDICATOR . . . . . . . . . . . . . . 35
AN
INSTRUMENT CLUSTER
8J - 1
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст