fuel additives DODGE RAM 2001 Service Repair Manual

It is even more important to look for gasoline with-
out MMT in Canada because MMT can be used at
levels higher than allowed in the United States.
MMT is prohibited in Federal and California refor-
mulated gasoline.
SULFUR IN GASOLINE
If you live in the northeast United States, your
vehicle may have been designed to meet California
low emission standards with Cleaner-Burning Cali-
fornia reformulated gasoline with low sulfur. If such
fuels are not available in states adopting California
emission standards, your vehicles will operate satis-
factorily on fuels meeting federal specifications, but
emission control system performance may be
adversely affected. Gasoline sold outside of California
is permitted to have higher sulfur levels which may
affect the performance of the vehicle's catalytic con-
verter. This may cause the Malfunction Indicator
Lamp (MIL), Check Engine or Service Engine Soon
light to illuminate. We recommend that you try a dif-
ferent brand of unleaded gasoline having lower sulfur
to determine if the problem is fuel related prior to
returning your vehicle to an authorized dealer for
service.
CAUTION: If the Malfunction Indicator Lamp (MIL),
Check Engine or Service Engine Soon light is flash-
ing, immediate service is required; see on-board
diagnostics system section.
MATERIALS ADDED TO FUEL
All gasoline sold in the United States and Canada
are required to contain effective detergent additives.
Use of additional detergents or other additives is not
needed under normal conditions.
FUEL SYSTEM CAUTIONS
CAUTION: Follow these guidelines to maintain your
vehicle's performance:
²The use of leaded gas is prohibited by Federal
law. Using leaded gasoline can impair engine perfor-
mance, damage the emission control system, and
could result in loss of warranty coverage.
²An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your dealer for service assistance.²When pulling a heavy load or driving a fully
loaded vehicle when the humidity is low and the tem-
perature is high, use a premium unleaded fuel to
help prevent spark knock. If spark knock persists,
lighten the load, or engine piston damage may result.
²The use of fuel additives which are now being
sold as octane enhancers is not recommended. Most
of these products contain high concentrations of
methanol. Fuel system damage or vehicle perfor-
mance problems resulting from the use of such fuels
or additives is not the responsibility of Daimler-
Chrysler Corporation and may not be covered under
the new vehicle warranty.
NOTE: Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
DESCRIPTION - FUEL REQUIREMENTS -
DIESEL ENGINE
DESCRIPTION
WARNING: Do not use alcohol or gasoline as a fuel
blending agent. They can be unstable under certain
conditions and hazardous or explosive when mixed
with diesel fuel.
Use good quality diesel fuel from a reputable sup-
plier in your Dodge truck. For most year-round ser-
vice, number 2 diesel fuel meeting ASTM
specification D-975 will provide good performance. If
the vehicle is exposed to extreme cold (below 0ÉF/-
18ÉC), or is required to operate at colder-than-normal
conditions for prolonged periods, use climatized No. 2
diesel fuel or dilute the No. 2 diesel fuel with 50%
No. 1 diesel fuel. This will provide better protection
from fuel gelling or wax-plugging of the fuel filters.
Diesel fuel is seldom completely free of water. To
prevent fuel system trouble, including fuel line freez-
ing in winter, drain the accumulated water from the
fuel/water separator using the fuel/water separator
drain provided. If you buy good-quality fuel and fol-
low the cold-weather advice above, fuel conditioners
should not be required in your vehicle. If available in
your area, a high cetane ªpremiumº diesel fuel may
offer improved cold starting and warm-up perfor-
mance.
0 - 2 LUBRICATION & MAINTENANCEBR/BE
LUBRICATION & MAINTENANCE (Continued)

COLD FOULING/CARBON FOULING
Cold fouling is sometimes referred to as carbon
fouling. The deposits that cause cold fouling are basi-
cally carbon (Fig. 29). A dry, black deposit on one or
two plugs in a set may be caused by sticking valves
or defective spark plug cables. Cold (carbon) fouling
of the entire set of spark plugs may be caused by a
clogged air cleaner element or repeated short operat-
ing times (short trips).
WET FOULING OR GAS FOULING
A spark plug coated with excessive wet fuel or oil
is wet fouled. In older engines, worn piston rings,
leaking valve guide seals or excessive cylinder wear
can cause wet fouling. In new or recently overhauled
engines, wet fouling may occur before break-in (nor-
mal oil control) is achieved. This condition can usu-
ally be resolved by cleaning and reinstalling the
fouled plugs.
OIL OR ASH ENCRUSTED
If one or more spark plugs are oil or oil ash
encrusted (Fig. 30), evaluate engine condition for the
cause of oil entry into that particular combustion
chamber.
ELECTRODE GAP BRIDGING
Electrode gap bridging may be traced to loose
deposits in the combustion chamber. These deposits
accumulate on the spark plugs during continuous
stop-and-go driving. When the engine is suddenly
subjected to a high torque load, deposits partially liq-
uefy and bridge the gap between electrodes (Fig. 31).This short circuits the electrodes. Spark plugs with
electrode gap bridging can be cleaned using standard
procedures.
SCAVENGER DEPOSITS
Fuel scavenger deposits may be either white or yel-
low (Fig. 32). They may appear to be harmful, but
this is a normal condition caused by chemical addi-
tives in certain fuels. These additives are designed to
change the chemical nature of deposits and decrease
spark plug misfire tendencies. Notice that accumula-
tion on the ground electrode and shell area may be
heavy, but the deposits are easily removed. Spark
plugs with scavenger deposits can be considered nor-
mal in condition and can be cleaned using standard
procedures.
Fig. 30 Oil or Ash Encrusted
Fig. 31 Electrode Gap Bridging
1 - GROUND ELECTRODE
2 - DEPOSITS
3 - CENTER ELECTRODE
Fig. 32 Scavenger Deposits
1 - GROUND ELECTRODE COVERED WITH WHITE OR
YELLOW DEPOSITS
2 - CENTER ELECTRODE
BR/BEIGNITION CONTROL 8I - 17
SPARK PLUG (Continued)

SEAT TRACK ADJUSTER - REMOVAL....23-143
SEATBELT INDICATOR - DESCRIPTION....8J-27
SEATBELT INDICATOR - OPERATION......8J-27
SEATS - CLEANING, INTAKE/EXHAUST
VALVES ...............9-140,9-198,9-27,9-84
SEATS - DESCRIPTION...............23-131
SEATS - DESCRIPTION, INTAKE/
EXHAUST VALVES . . 9-138,9-195,9-25,9-253,9-81
SEATS - INSPECTION.................30-13
SEATS - INSPECTION, INTAKE/EXHAUST
VALVES ...............9-141,9-198,9-27,9-84
SEATS - INSTALLATION, INTAKE/
EXHAUST VALVES.......9-141,9-260,9-28,9-85
SEATS - OPERATION.................23-131
SEATS - REMOVAL, INTAKE/EXHAUST
VALVES ...............9-140,9-258,9-27,9-84
SEATS - STANDARD PROCEDURE-
VALVES,GUIDES AND SPRINGS,
INTAKE/EXHAUST VALVES..............9-253
SEATS - VALVE SERVICE, INTAKE/
EXHAUST VALVES....................9-195
SECOND WEATHERSTRIP -
INSTALLATION, FRONT DOOR..........23-155
SECOND WEATHERSTRIP - REMOVAL,
FRONT DOOR......................23-154
SECURITY - DESCRIPTION, VEHICLE
THEFT..............................8Q-1
SECURITY - OPERATION, VEHICLE THEFT . . 8Q-2
SECURITY SYSTEM - DIAGNOSIS AND
TESTING, VEHICLE THEFT..............8Q-3
SELECTION-ADDITIVES - STANDARD
PROCEDURE, COOLANT..................7-17
SELECTOR INDICATOR - DESCRIPTION,
GEAR..............................8J-21
SELECTOR INDICATOR - OPERATION,
GEAR..............................8J-21
SENDING UNIT - DIAGNOSIS AND
TESTING, FUEL GAUGE.................14-8
SENDING UNIT / SENSOR -
DESCRIPTION, FUEL LEVEL........14-7,14-73
SENDING UNIT / SENSOR -
INSTALLATION, FUEL LEVEL.............14-9
SENDING UNIT / SENSOR - OPERATION,
FUEL LEVEL.....................14-7,14-73
SENDING UNIT / SENSOR - REMOVAL,
FUEL LEVEL..........................14-8
SENSE - DESCRIPTION, IGNITION
CIRCUIT............................8E-17
SENSE - OPERATION, IGNITION CIRCUIT . . 8E-19
SENSE - PCM INPUT - OPERATION, ASD . . . 8I-3
SENSOR - 3.9L/5.2L/5.9L -
DESCRIPTION, ENGINE COOLANT
TEMP...............................7-48
SENSOR - 3.9L/5.2L/5.9L -
INSTALLATION, ENGINE COOLANT
TEMP...............................7-48
SENSOR - 3.9L/5.2L/5.9L - OPERATION,
ENGINE COOLANT TEMP................7-48
SENSOR - 3.9L/5.2L/5.9L - REMOVAL,
ENGINE COOLANT TEMP................7-48
SENSOR - DESCRIPTION, ACCELERATOR
PEDAL POSITION....................14-91
SENSOR - DESCRIPTION, AMBIENT
TEMP.............................8M-11
SENSOR - DESCRIPTION, BATTERY
TEMPERATURE......................8F-29
SENSOR - DESCRIPTION, FUEL LEVEL
SENDING UNIT..................14-7,14-73
SENSOR - DESCRIPTION, FUEL
TEMPERATURE......................14-99
SENSOR - DESCRIPTION, O2...........14-46
SENSOR - DESCRIPTION, SPEED . 21-253,21-424,
21-597,21-770
SENSOR - DESCRIPTION, THROTTLE
POSITION..........................14-51
SENSOR - DESCRIPTION,
TRANSMISSION TEMPERATURE . 21-262,21-433,
21-606,21-779
SENSOR - DESCRIPTION, WATER IN
FUEL
..............................14-85
SENSOR - DIAGNOSIS & TESTING,
AMBIENT TEMPERATURE
..............8M-12
SENSOR - DIAGNOSIS & TESTING,
HEATED SEAT ELEMENT
...............8G-11
SENSOR - INSTALLATION,
ACCELERATOR PEDAL POSITION
........14-93
SENSOR - INSTALLATION, AMBIENT
TEMP
.............................8M-13SENSOR - INSTALLATION, BATTERY
TEMPERATURE......................8F-29
SENSOR - INSTALLATION, FUEL LEVEL
SENDING UNIT.......................14-9
SENSOR - INSTALLATION, MAP........14-104
SENSOR - INSTALLATION, O2...........14-48
SENSOR - OPERATION, ACCELERATOR
PEDAL POSITION....................14-91
SENSOR - OPERATION, AMBIENT TEMP . . 8M-11
SENSOR - OPERATION, BATTERY
TEMPERATURE......................8F-29
SENSOR - OPERATION, FUEL LEVEL
SENDING UNIT..................14-7,14-73
SENSOR - OPERATION, FUEL
TEMPERATURE.....................14-100
SENSOR - OPERATION, O2.............14-46
SENSOR - OPERATION, SPEED . . 21-253,21-424,
21-597,21-770
SENSOR - OPERATION, THROTTLE
POSITION..........................14-51
SENSOR - OPERATION, TRANSMISSION
TEMPERATURE . . . 21-262,21-433,21-606,21-779
SENSOR - OPERATION, WATER IN FUEL . . 14-85
SENSOR - REMOVAL, ACCELERATOR
PEDAL POSITION....................14-91
SENSOR - REMOVAL, AMBIENT TEMP . . . 8M-12
SENSOR - REMOVAL, BATTERY
TEMPERATURE......................8F-29
SENSOR - REMOVAL, FUEL LEVEL
SENDING UNIT.......................14-8
SENSOR - REMOVAL, O2..............14-47
SENSOR - REMOVAL, WATER IN FUEL....14-85
SENSOR RETURN - DESCRIPTION.......8E-17
SENSOR/SWITCH - DESCRIPTION, OIL
PRESSURE.....................9-298,9-49
SENSOR/SWITCH - INSTALLATION, OIL
PRESSURE.........................9-299
SENSOR/SWITCH - OPERATION, OIL
PRESSURE.....................9-298,9-49
SENSOR/SWITCH - REMOVAL, OIL
PRESSURE.........................9-298
SEPARATOR - DESCRIPTION, FUEL
FILTER / WATER .....................14-59
SEPARATOR - INSTALLATION, FUEL
FILTER / WATER .....................14-61
SEPARATOR - OPERATION, FUEL FILTER
/ WATER ...........................14-59
SEPARATOR - REMOVAL, FUEL FILTER /
WATER.............................14-60
SERIES - INSTALLATION, REAR PARK
BRAKE CABLES - 1500.................5-39
SERIES - REMOVAL, REAR PARK BRAKE
CABLES - 1500.......................5-37
SERIES WITH DRUM BRAKES -
INSTALLATION, REAR PARK BRAKE
CABLE 2500/3500.....................5-39
SERIES WITH DRUM BRAKES -
REMOVAL, REAR PARK BRAKE
CABLES 2500/3500....................5-38
SERVO - ASSEMBLY, FRONT....21-208,21-379,
21-553,21-723
SERVO - ASSEMBLY, REAR.....21-251,21-422,
21-595,21-768
SERVO - CLEANING, FRONT
....21-207,21-378,
21-552,21-723
SERVO - CLEANING, REAR
.....21-251,21-422,
21-594,21-768
SERVO - DESCRIPTION, FRONT
. . 21-206,21-377,
21-551,21-722
SERVO - DESCRIPTION, REAR
. . . 21-250,21-421,
21-594,21-767
SERVO - DESCRIPTION, SPEED
CONTROL
...........................8P-5
SERVO - DISASSEMBLY, FRONT
. 21-207,21-378,
21-552,21-723
SERVO - DISASSEMBLY, REAR
. . 21-251,21-421,
21-594,21-768
SERVO - INSPECTION, FRONT
. . . 21-207,21-378,
21-553,21-723
SERVO - INSTALLATION, SPEED
CONTROL
..........................8P-10
SERVO - OPERATION, FRONT
. . . 21-207,21-377,
21-552,21-723
SERVO - OPERATION, REAR
....21-250,21-421,
21-594,21-767
SERVO - OPERATION, SPEED CONTROL
. . . 8P-5
SERVO - REMOVAL, SPEED CONTROL
.....8P-6SEVERAL LOADS - STANDARD
PROCEDURE, TESTING FOR SHORT TO
GROUND ON FUSES POWERING......8W-01-7
SHAFT - ASSEMBLY, PLANETARY
GEARTRAIN/OUTPUT....21-241,21-412,21-588,
21-760
SHAFT - DESCRIPTION, PLANETARY
GEARTRAIN/OUTPUT....21-240,21-410,21-585,
21-757
SHAFT - DESCRIPTION, PROPELLER.......3-1
SHAFT - DIAGNOSIS AND TESTING,
PROPELLER...........................3-3
SHAFT - DISASSEMBLY, PLANETARY
GEARTRAIN/OUTPUT....21-240,21-411,21-586,
21-757
SHAFT - FRONT - INSTALLATION,
PROPELLER...........................3-8
SHAFT - FRONT - REMOVAL,
PROPELLER...........................3-8
SHAFT - INSPECTION, PLANETARY
GEARTRAIN/OUTPUT....21-241,21-411,21-587,
21-760
SHAFT - INSTALLATION, PITMAN........19-23
SHAFT - INSTALLATION, WORM.........19-29
SHAFT - OPERATION, PLANETARY
GEARTRAIN/OUTPUT....21-240,21-410,21-585,
21-757
SHAFT - OPERATION, PROPELLER.........3-1
SHAFT - REAR - INSTALLATION,
PROPELLER...........................3-9
SHAFT - REAR - REMOVAL, PROPELLER....3-9
SHAFT - REMOVAL, PITMAN............19-22
SHAFT - REMOVAL, WORM............19-27
SHAFT - STANDARD PROCEDURES,
PROPELLER...........................3-5
SHAFT FRONT BEARING -
INSTALLATION, OUTPUT . 21-213,21-384,21-560,
21-730
SHAFT FRONT BEARING - REMOVAL,
OUTPUT.........21-213,21-384,21-559,21-730
SHAFT REAR BEARING - INSTALLATION,
OUTPUT.........21-213,21-384,21-560,21-731
SHAFT REAR BEARING - REMOVAL,
OUTPUT.........21-213,21-384,21-560,21-731
SHAFT SEAL - INSTALLATION, FRONT
OUTPUT...............21-852,21-886,21-922
SHAFT SEAL - INSTALLATION, PITMAN . . . 19-24
SHAFT SEAL - REMOVAL, FRONT
OUTPUT...............21-851,21-886,21-922
SHAFT SEAL - REMOVAL, PITMAN.......19-23
SHAFT SEALS - INSTALLATION, AXLE . 3-29,3-61,
3-94
SHAFT SEALS - REMOVAL, AXLE . 3-29,3-61,3-94
SHAFT, SPECIAL TOOLS - PROPELLER......3-8
SHAFT, SPECIFICATIONS - PROPELLER.....3-8
SHAFTS - INSTALLATION, AXLE....3-125,3-156,
3-185,3-28,3-60,3-93
SHAFTS - INTERMEDIATE -
INSTALLATION, AXLE..................3-28
SHAFTS - INTERMEDIATE - REMOVAL,
AXLE...............................3-28
SHAFTS - REMOVAL, AXLE . . 3-125,3-156,3-185,
3-28,3-60,3-93
SHIELD - INSTALLATION, REAR SPLASH . . 23-96
SHIELD - REMOVAL, REAR SPLASH......23-96
SHIELDS - DESCRIPTION, HEAT.........11-10
SHIELDS - INSTALLATION, FRONT END
SPLASH
............................23-92
SHIELDS - INSTALLATION, HEAT
........11-10
SHIELDS - REMOVAL, FRONT END
SPLASH
............................23-92
SHIELDS - REMOVAL, HEAT
............11-10
SHIFT BOOT - INSTALLATION, 4WD
FLOOR
............................23-122
SHIFT BOOT - MANUAL TRANSMISSION
- INSTALLATION
....................23-122
SHIFT BOOT - MANUAL TRANSMISSION
- REMOVAL
........................23-122
SHIFT BOOT - REMOVAL, 4WD FLOOR
. . . 23-122
SHIFT COVER - INSTALLATION
....21-133,21-90
SHIFT COVER - REMOVAL
.......21-132,21-90
SHIFT INDICATOR (TRANSFER CASE) -
DESCRIPTION
.......................8J-29
SHIFT INDICATOR (TRANSFER CASE) -
OPERATION
.........................8J-29
SHIFT LEVER - ADJUSTMENT
. . . 21-853,21-888,
21-925
BR/BEINDEX 31
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