1999 DODGE RAM Spark plugs
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Air Filter
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... (2) ........ ( 3) 15,000
Coolant .................................. ( 4) ............... ( 4)
Engine Oil
Normal Service .......................... 6 ............... 7500
Severe Service ......................... ( 2) .............. 3000
Engine Oil Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 2) .............. 6000
PCV Valve ( 5)
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 2) ............ 30,000
Spark Plugs
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 2) ............ 30,000
Spark Plug Wires
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 2) ............ 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 2) ............ 12,000
Transfer Case Fluid (4WD)
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 2) ............ 36,000
Front Differential Fluid (4WD) ( 6)
Severe Service ......................... ( 2) ............ 12,000
Rear Differential Fluid ( 6)
Severe Service ......................... ( 2) ............ 12,000
Repack Front Wheel Bearings
Normal Service .......................... 18 ............ 22,500
Severe Service ......................... ( 2) ............ 21,000
( 1) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 2) - Monthly interval is not available from manufacturer.
( 3) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 4) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 5) - Inspect at scheduled interval and replace as necessary.
( 6) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - LIGHT-DUTY) ( 1)( 2) \
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Component Months Miles
Air Filter
Normal Service ......................... 24 ............. 30,000
Severe Service ......................... ( 3) ........ ( 4) 15,000
Coolant .................................. ( 5) ............... ( 5)
Engine Oil
Page 1184 of 1691
Normal Service .......................... 6 ............... 7500
Severe Service ......................... (3) .............. 3000
Engine Oil Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 3) .............. 6000
PCV Valve ( 6)
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plugs
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plug Wires
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 12,000
Manual Transmission Fluid ................ ( 7) ............... ( 7)
Transfer Case Fluid (4WD)
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 36,000
Front Differential Fluid (4WD) ( 8)
Severe Service ......................... ( 3) ............ 12,000
Rear Differential Fluid ( 8)
Severe Service ......................... ( 3) ............ 12,000
Repack Front Wheel Bearings (2WD)
Normal Service .......................... 18 ............ 22,500
Severe Service ......................... ( 3) ............ 21,000
( 1) - Light-duty vehicles apply to all 1500 models and 2500 except
5.9L diesel or 8.0L engines.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Inspect at scheduled interval and replace as necessary.
( 7) - Service interval is not available from manufacturer.
( 8) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... ( 3) ........... ( 4) 15,000
Coolant ............................... ( 5) .................. ( 5)
Engine Oil & Filter
Normal Service ....................... 6 .................. 6000
Severe Service ...................... ( 3) ................. 3000
Page 1185 of 1691
Spark Plugs
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... (3) ............... 30,000
Spark Plug Wires
Normal Service ...................... 60 ................ 60,000
Severe Service ...................... ( 3) ............... 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ...................... 24 ................ 24,000
Severe Service ...................... ( 3) ............... 12,000
Manual Transmission Fluid ............. ( 6) .................. ( 6)
Transfer Case Fluid (4WD)
Normal Service ...................... 36 ................ 36,000
Severe Service ...................... ( 3) ............... 36,000
Front Differential Fluid (4WD) ( 7)
Severe Service ...................... ( 3) ............... 12,000
Rear Differential Fluid ( 7)
Severe Service ...................... ( 3) ............... 12,000
Repack Front Wheel Bearings (2WD)
Normal Service ....................... 18 ............... 18,000
Severe Service ...................... ( 3) ............... 24,000
( 1) - Medium-duty vehicles apply to 2500 and 3500 Calif. models with
8.0L engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Service interval is not available from manufacturer.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - HEAVY-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
5.9L
Normal Service .................... 24 ................. 24,000
Severe Service ................... ( 3) ............. ( 4) 12,000
8.0L ............................... 12 ................. 12,000
Air Injection Pump Filter
Normal Service ..................... 24 ................. 24,000
Severe Service .................... ( 3) ............. ( 4) 12,000
Coolant ............................. ( 5) .................... ( 5)
EGR Valve (5.9L Only) ( 6)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Engine Oil
Normal Service ..................... 6 .................... 6000
Severe Service .................... ( 3) ................... 3000
Engine Oil Filter
Page 1186 of 1691
5.9L
Normal Service .................... 12 ................. 12,000
Severe Service ................... (3) ................... 6000
8.0L
Normal Service .................... 6 .................... 6000
Severe Service ................... ( 3) ................... 3000
PCV Valve (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service ( 7) ................ ( 3) ................. 30,000
Distributor Cap & Rotor (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Spark Plugs
Normal Service ..................... 30 ................. 30,000
Severe Service .................... ( 3) ................. 30,000
Spark Plug Wires
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Oxygen Sensor (5.9L Only)
Normal Service ..................... 82 ................. 82,500
Severe Service ..................... ( 3) ................ 82,500
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ..................... 24 ................. 24,000
Severe Service ..................... ( 3) ................ 12,000
Manual Transmission Fluid ............ ( 8) ................... ( 8)
Transfer Case Fluid (4WD)
Normal Service ..................... 36 ................. 36,000
Severe Service ..................... ( 3) ................ 18,000
Front Differential Fluid (4WD) ( 9)
Severe Service ..................... ( 3) ................ 12,000
Rear Differential Fluid ( 9) .......... ( 3) ................ 12,000
Repack Front Wheel Bearings
2WD
Normal Service .................... 24 ................. 24,000
Severe Service .................... ( 3) .................. 9000
4WD
Normal Service .................... 18 ................. 18,000
Severe Service .................... ( 3) .................. 6000
( 1) - Heavy-duty vehicles apply to 2500 and 3500 Federal models with
8.0L engine and all 3500 models with 5.9L gasoline engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect filter every 12,000 miles and replace as necessary.
Replace at 24,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - If equipped with EGR valve, clean EGR passages when replacing
EGR valve.
( 7) - Inspect and replace as necessary. Replace PCV valve at 60,000
miles.
( 8) - Service interval is not available from manufacturer.
( 9) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
Page 1188 of 1691
Coolant ............................ (4) ..................... ( 4)
Engine Oil
Normal Service .................... 6 ..................... 7500
Severe Service ................... ( 2) .................... 3000
Engine Oil Filter
Normal Service ................... 12 ................... 15,000
Severe Service ................... ( 2) .................... 6000
PCV Valve ( 5)
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 30,000
Spark Plugs
Normal Service ................... 24 ................... 30,000
Severe Service ................... ( 2) .................. 30,000
Spark Plug Wires
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 60,000
Automatic Transaxle Fluid,
Filter & Band Adjustment .......... ( 6) ..................... ( 6)
Rear Differential Fluid ( 7)
Severe Service ................... ( 2) .................. 12,000
Repack Front Wheel Bearings
Normal Service ................... 18 ................... 22,500
Severe Service ................... ( 2) .................. 21,000
( 1) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, or operating in dusty or excessively hot
conditions.
( 2) - Monthly interval is not available from manufacturer.
( 3) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 4) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 5) - Inspect at scheduled interval and replace as necessary.
( 6) - Normal service interval is not available from manufacturer.
Under severe service, change fluid, filter and adjust bands
every 12,000 miles.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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BELT ADJUSTMENT (Tension In Lbs. (kg) Using Belt Tension Gauge) \
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Application New Belt (1) Used Belt
Caravan
2.4L
A/C & Generator ...................... 190 (86) ...... 115 (52\
)
Power Steering ....................... 140 (64) ....... 90 (41\
)
3.0L
A/C .................................. 150 (68) ....... 80 (36\
)
Generator & Power Steering ............. ( 2) .............. ( 2)
3.3L & 3.8L ............................. ( 2) .............. ( 2)
Dakota
2.5L .................................. 200 (91) ...... 160 (73\
)
3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Durango
3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Page 1189 of 1691
Ram Pickup, Ram Van & Ram Wagon ........... (2) .............. ( 2)
Town & Country
3.3L & 3.8L ............................. ( 2) .............. ( 2)
Voyager
2.4L
A/C & Generator ...................... 190 (86) ...... 115 (52\
)
Power Steering ....................... 140 (64) ....... 90 (41\
)
3.0L
A/C .................................. 150 (68) ....... 80 (36\
)
Generator & Power Steering ............. ( 2) .............. ( 2)
3.3L .................................... ( 2) .............. ( 2)
( 1) - Used belt is a belt that has been in service for more than 15
minutes.
( 2) - Automatic belt tensioner is used. Belt tension adjustment is not
required.
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MECHANICAL CHECKS
ENGINE COMPRESSION
Ensure battery is fully charged. Warm engine to normal
operating temperature. Disconnect wire at ignition coil to prevent
engine from starting. Check engine compression with all spark plugs
removed and throttle wide open.
COMPRESSION SPECIFICATIONS
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Application Specification
Compression Ratio
Caravan
2.4L ...................................................... 9.4:1
3.0L ...................................................... 8.9:1
3.3L ...................................................... 8.9:1
3.8L ...................................................... 9.6:1
Dakota & Durango ........................................... 9.1:1
Ram Pickup
3.9L, 5.2L & 5.9L (Gasoline) .............................. 9.1:1\
5.9L (Diesel) ............................................ 17.5:1\
8.0L ...................................................... 8.4:1
Ram Van & Ram Wagon ........................................ 9.1:1
Town & Country
3.3L ...................................................... 8.9:1
3.8L ...................................................... 9.6:1
Voyager
2.4L ...................................................... 9.4:1
3.0L ...................................................... 8.9:1
3.3L ...................................................... 8.9:1
Normal Compression Pressure
Caravan
2.4L ............................. 170-225 psi (11.9-15.7 kg/cm
)
3.0L ...................................... 178 psi (12.5 kg/cm)
3.3L & 3.8L ................................................. ( 1)
Dakota
2.5L .............................. 120-150 psi (8.4-10.5 kg/cm
)
3.9L, 5.2L & 5.9L ........................................... ( 1)
Durango ...................................................... ( 1)
Ram Pickup, Ram Van & Ram Wagon .............................. ( 1)
Town & Country ............................................... ( 1)
Voyager
Page 1192 of 1691
Cylinder No. 1 Or 4 ........................................ 4200
Cylinder No. 2 Or 3 ........................................ 3200
3.0L
Cylinder No. 1 ........................................... 14,000
Cylinder No. 2 ........................................... 10,400
Cylinder No. 3 ........................................... 14,900
Cylinder No. 4 ........................................... 11,500
Cylinder No. 5 ........................................... 17,500
Cylinder No. 6 ........................................... 10,300
Ignition Coil Wire ....................................... 11,100
3.3L
Cylinder No. 1 ........................................... 18,500
Cylinder No. 2 ........................................... 15,500
Cylinder No. 3 ........................................... 20,400
Cylinder No. 4 ........................................... 21,200
Cylinder No. 5 ........................................... 27,700
Cylinder No. 6 ........................................... 26,700
(1) - Maximum wire resistance is listed according to high tension wire
application. For cylinder identification, see FIRING ORDER &
TIMING MARKS.
( 2) - Resistance should be 250-1000 ohms per one inch or 3000-12,000
ohms per 12 inches.
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SPARK PLUGS
SPARK PLUG TYPE ( 1) \
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Application Champion No.
Caravan
2.4L ..................................................... RC12YC5
3.0L ..................................................... RN11YC4
3.3L & 3.8L ............................................. RN14PMP5
Dakota
2.5L ..................................................... RC12ECC
3.9L, 5.2L & 5.9L ........................................ RC12LC4
Durango .................................................... RC12LC4
Ram Pickup
3.9L, 5.2L & 5.9L ........................................ RC12LC4
8.0L ...................................................... QC9MC4
Ram Van & Ram Wagon ........................................ RC12LC4
Town & Country ............................................ RN14PMP5
Voyager
2.4L ..................................................... RC12YC5
3.0L ..................................................... RN11YC4
3.3L .................................................... RN14PMP5
(1) - Check spark plug application on underhood vehicle emission
control label. If application differs from application listed,
use application on underhood vehicle emission control label.
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SPARK PLUG SPECIFICATIONS ( 1) \
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Application Gap Torque
In. (mm) Ft. Lbs. (N.m\
)
Caravan
2.4L ................ .048-.053 (1.22-1.35) ............ 20 (27\
)
3.0L ................ .039-.044 (1.00-1.12) ............ 20 (27\
)
3.3L & 3.8L ......... .048-.053 (1.22-1.35) ............ 20 (27\
)
Page 1484 of 1691
various switch input operations to adjust IAC motor to obtain optimum
idle conditions. Deceleration stall is prevented by increasing airflow
when throttle is closed suddenly.
IGNITION SYSTEM
NOTE: Pickup equipped with 8.0L engine uses Distributorless
Ignition system (DIS). All other models use a Hall Effect
ignition system.
The PCM completely controls ignition system. During
crank/start mode, PCM will set a fixed amount of spark advance for an
efficient engine start. Amount of spark advance or retard is
determined by inputs that PCM receives from ECT sensor, engine vacuum
and engine RPM. During engine operation, PCM can supply an infinite
number of advance curves to ensure proper engine operation.
DISTRIBUTORLESS IGNITION SYSTEM (DIS)
DIS eliminates mechanical ignition components that can wear
out. PCM has complete ignition control and uses a coil pack, CMP
sensor and CKP sensor to control ignition timing. CMP sensor reads
slots in cam timing sprocket. PCM uses this information along with
information from CKP sensor to determine if fuel injectors and
ignition coils are properly sequenced for correct cylinders.
Basic timing is determined by CKP sensor position and is not
adjustable. One complete engine revolution may be required for PCM to
determine crankshaft position during cranking.
Molded ignition coils are used. Each coil fires 2 paired
spark plugs at the same time. One cylinder is on compression stroke
and other cylinder is on exhaust stroke.
HALL EFFECT IGNITION SYSTEM
This system is equipped with a Hall Effect distributor. See
Fig. 1 . Shutter(s) attached to distributor shaft rotate through
distributor Hall Effect switch, also referred to as a CMP sensor,
which contains a distributor pick-up (a Hall Effect device and
magnet). As shutter blade(s) pass through pick-up, magnetic field is
interrupted and voltage is toggled between high and low. PCM uses this
cylinder position data from CMP sensor, along with engine speed (RPM)
and CKP sensor data, to control ignition timing and injector pulse
width to maintain optimum driveability.
EMISSION SYSTEMS
Vehicles are equipped with different combinations of emission
system components. Not all components are used on all models. To
determine component usage on a specific model, see EMISSION
APPLICATIONS - TRUCKS article.
AIR INJECTION SYSTEM
This system adds a controlled amount of air to exhaust gases,
through air relief valve and check valves, to assist oxidation of
hydrocarbons and carbon monoxide in exhaust stream. Air is injected at
catalytic converters.
CRANKCASE VENTILATION (CCV) SYSTEM
CCV system performs same function as a conventional Positive