1999 DODGE RAM engine
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(8) - One used on vehicles with light-duty emissions. Two used on
vehicles with heavy-duty emissions.
(
9) - Used on vehicles with heavy-duty emissions.
(
10 ) - Two catalytic converters are required.
(
11 ) - Four sensors used on vehicles with medium-duty emissions.
Two sensors used on vehicles with heavy-duty emissions.
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ABBREVIATIONS
ABBREVIATION DEFINITIONS\
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Abbreviation Definition
AIH ................................... Air Intake Heaters
AIH-TS ............................ AIH Temperature Sensor
AP ............................. Air Pump Injection System
AP-CKV .................................... AP Check Valve
AP-RV .................................... AP Relief Valve
BP/EGR ........................... Backpressure EGR System
BP/EGR-BPT ................ BP/EGR Backpressure Transducer
CCV ................................ Crankcase Ventilation
CEC ......................... Computerized Engine Controls
CNG ............................... Compressed Natural Gas
EFI ............................ Electronic Fuel Injection
EGR-CKV .................................. EGR Check Valve
EVAP ............................. Fuel Evaporative System
EVAP-CVV ........................ EVAP Canister Vent Valve
EVAP-LDP ........................ EVAP Leak Detection Pump
EVAP-LDPF ................ EVAP Leak Detection Pump Filter
EVAP-PRRV ............ EVAP Pressure Relief Rollover Valve
EVAP-PSOL ............................ EVAP Purge Solenoid
EVAP-VC .............................. EVAP Vapor Canister
EVAP-VV ........................... EVAP Ventilation Valve
FR ................................... Fillpipe Restrictor
HO2S ................................ Heated Oxygen Sensor
MIL .......................... Malfunction Indicator Light
PCV ....................... Positive Crankcase Ventilation
SFI .................. Sequential Multiport Fuel Injection
SPK ....................................... Spark Controls
SPK-CC ........................... SPK Computer Controlled
TWC ........................ Three-Way Catalytic Converter
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A - E N G IN E/V IN ID
1999 D odge P ic ku p R 1500
1999 ENGINE PERFORMANCE
CHRY - Chrysler Corp. Introduction - Trucks
MODEL IDENTIFICATION
1999 MODEL COVERAGE \
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MODEL BODY ENGINE ENGINE FUEL IGNITION
CODE ID
(1) SYSTEM SYSTEM
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Caravan & NS 2.4L B SFI (
2) DIS ( 3)
Grand Caravan
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\b\
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3.0L 3 SFI (
2) Hall Effect
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\b\
\b\
3.3L R SFI DIS (
3)
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\b\
\b\
\b\
3.3L G (
4) SFI DIS ( 3)
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\b\
\b\
\b\
3.8L L SFI DIS (
3)
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\b\b\
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\b\
Dakota AN 2.5L P SFI (
2) Hall Effect
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\b\
\b\
\b\
3.9L X SFI (
2) Hall Effect
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\b\
\b\
\b\
5.2L Y SFI (
2) Hall Effect
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\b\
\b\
\b\
5.9L Z SFI (
2) Hall Effect
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\b\
Durango DN 3.9L X SFI (
2) Hall Effect
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5.2L Y SFI (
2) Hall Effect
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5.9L Z SFI (
2) Hall Effect
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Ram Pickup (
5) 3.9L X SFI ( 2) Hall Effect
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5.2L Y SFI (
2) Hall Effect
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5.9L LD (
6) Z SFI ( 2) Hall Effect
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5.9L HD (
7) 5 SFI ( 2) Hall Effect
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5.9L Diesel 6 EFI (
8) N/A
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8.0L W SFI (
2) DIS ( 3)
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Ram Van & AB 3.9L X SFI (
2) Hall Effect
Ram Wagon
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5.2L Y SFI (
2) Hall Effect
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5.2L 2 (
9) SFI ( 2) Hall Effect
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5.2L T (
10) SFI ( 2) Hall Effect
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5.9L Z SFI (
2) Hall Effect
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Town & Country NS 3.3L R SFI DIS (
3)
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3.3L G (
4) SFI DIS ( 3)
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![DODGE RAM 1999 Service Repair Manual 3.8L L SFI DIS (3)
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3.8L L SFI DIS (3)
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Voyager & NS 2.4L B SFI DIS (
3)
Grand Voyager
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3.0L 3 SFI DIS (
3)
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3.3L R SFI DIS (
3)
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3.3L G (
4) SFI DIS ( 3)
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3.8L L SFI DIS (
3)
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(
1) - Engine may be identified by 8th character of Vehicle
Identification Number (VIN).
(
2) - Sequential Fuel Injection.
(
3) - Distributorless Ignition System.
(
4) - Engine code "G" indicates flex-fuel.
(
5) - Body code for standard pickup is BR. Body code for
Quad Cab is BE.
(
6) - Light-duty emissions.
(
7) - Heavy-duty emissions.
(
8) - Electronic fuel injection.
(
9) - Engine code "2" indicates Liquid Propane Gas (LPG).
(
10 ) - Engine code "T" indicates Compressed Natural Gas (CNG).
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Fig. 1: VIN Definition
MODEL/YEAR VIN CODE APPLICATIONS
MODEL/YEAR VIN CODE APPLICATION
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![DODGE RAM 1999 Service Repair Manual \
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VIN Code](/manual-img/12/56915/w960_56915-600.png "DODGE RAM 1999 Service Repair Manual \
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VIN Code")
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VIN Code Model Year
V ............................................................. 1997
W ............................................................. 1998
X ............................................................. 1999
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ENGINE CODE LOCATION
ENGINE CODE LOCATION\
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Application Location
Caravan, Grand Caravan,
Grand Voyager, Town & Country,
& Voyager
2.4L 4-Cyl. .............................. Rear Of Cylinder Block,
Below Cylinder Head Surface,
Just Above Flywheel
3.0L V6 ......................... Firewall Side Of Cylinder Block,
Below Cylinder Head,
Near Rear Of Exhaust Manifold
3.3L & 3.8L V6 ........................... Rear Of Cylinder Block,
Below Cylinder Head,
Just Above Flywheel
Dakota, Durango, Ram Pickup,
Ram Van & Ram Wagon
2.5L 4-Cylinder ................... Machined Pad On Right Side Of
Cylinder Block, Between Cylinders
No. 3 & 4
3.9L V6, 5.2L V8 & 5.9L V8 .............. Machined Pad Left Front
Corner Of Cylinder Block
5.9L 6-Cyl. Diesel ........................ On Engine Data Plate,
Also Stamped On Right Side Of
Cylinder Block, Above Oil Cooler
8.0L V10 ............................. Lower Left Front Corner Of
Cylinder Block, In Front Of Engine Mount
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Page 602 of 1691
EM IS SIO N C O NTR O L V IS U AL IN SPEC TIO N P R O CED URES
1999 D odge P ic ku p R 1500
1983-98 GENERAL INFORMATION
Emission Control Visual Inspection Procedures
All Models
* PLEASE READ THIS FIRST *
This article is provided for general information only. Not
all information applies to all makes and models. For more complete
information, see appropriate article(s) in the ENGINE PERFORMANCE
Section.
EMISSION CONTROL LABELS
The vehicle manufacturer's emission control label, also known
as the underhood tune-up label or Vehicle's Underhood Emission Control
System (VECI) label, is located in the engine compartment. Information\
regarding year model of vehicle, engine size, number of cylinders,
emission equipment or type, engine tune-up specifications, whether
vehicle was manufactured for sale in California or is a Federal
vehicle, vacuum hose routing schematic, etc., can be found on this
label. See Fig. 1.
In addition to the VECI label, some emission control
inspection and maintenance programs may require an additional label to
be affixed to the vehicle in special circumstances. For example, in
California, a Bureau Of Automotive Repair (BAR) engine label may be
affixed to the left door post. A BAR engine label is only used when
the vehicle has an engine change, approved modification or is a
Specially Constructed (SPCN) or an acceptable Gray market vehicle.
Check your state's emission control inspection and maintenance laws to
determine if a similar label is used.
Fig. 1: Typical Emission Control Label
Courtesy of General Motors Corp.
EMISSION CONTROL VISUAL INSPECTION
* PLEASE READ THIS FIRST *
NOTE: The following emission control visual inspection procedures
should be used as a guide only. When performing a visual
inspection, always follow your state's recommended
Page 603 of 1691
inspection procedures.
A visual inspection is made to determine if any required
emission control devices are missing, modified or disconnected.
Missing, modified or disconnected systems must be made fully
operational before a vehicle can be certified.
POSITIVE CRANKCASE VENTILATION (PCV)
PCV controls the flow of crankcase fumes into the intake
manifold while preventing gases and flames from traveling in the
opposite direction. PCV is either an open or closed system. See Fig. 2
.
Ensure PCV system is installed as required. Verify valve,
required hoses, connections, flame arresters, etc., are present,
routed properly and in serviceable condition.
Fig. 2: Typical Open & Closed Type PCV System
THERMOSTATIC AIR CLEANER (TAC)
The TAC supplies warm air to air intake during cold engine
operation. This system is active during cold engine warm-up only.
Under all other operating conditions, air cleaner function is the same
as any non-thermostatic unit.
Ensure required exhaust shroud, hot air duct, vacuum hoses
and air cleaner components are present and installed properly. See
Fig. 3 . Ensure any required thermostatic vacuum switches are in place
and vacuum hoses are installed and in serviceable condition. Also
ensure air cleaner lid is installed right side up. Check for oversized
air filter elements and for additional holes in the air cleaner
housing.
Page 604 of 1691
Fig. 3: Typical Thermostatic Air Cleaner System
FUEL EVAPORATIVE SYSTEM (EVAP)
The EVAP system allows for proper fuel system ventilation
while preventing fuel vapors from reaching the atmosphere. This means
that vapors must be caught and stored while the engine is off, which
is when most fuel evaporation occurs. When the engine is started,
these fuel vapors can be removed from storage and burned. In most
systems, storage is provided by an activated charcoal (or carbon)
canister. See Fig. 4. On a few early systems, charcoal canisters are
not used. Instead, fuel vapors are vented into the PCV system and
stored inside the crankcase.
The main components of a fuel evaporation system are a sealed
fuel tank, a liquid-vapor separator and vent lines to a vapor-storing
canister filled with activated charcoal. The filler cap is normally
not vented to the atmosphere, but is fitted with a valve to allow both
pressure and vacuum relief.
Although a few variations do exist between manufacturers,
basic operation is the same for all systems. Check for presence of
vapor storage canister or crankcase storage connections when required.
Ensure required hoses, solenoids, etc., are present and connected
properly. Check for proper type fuel tank cap. Check for any non-OEM
or auxiliary fuel tanks for compliance and the required number of
evaporation canisters.
Page 607 of 1691
Single Diaphragm EGR Valve
This type uses a single diaphragm connected to the valve by a
shaft. Diaphragm is spring-loaded to keep valve closed in the absence
of vacuum. As throttle valves open and engine speed increases, vacuum
is applied to the EGR vacuum diaphragm, opening the EGR valve. This
vacuum signal comes from a ported vacuum source. Variations in the
vacuum signal control the amount of exhaust gas that is recirculated.
See Fig. 7 .
Verify EGR valve is present and not modified or purposely
damaged. Ensure thermal vacuum switches, pressure transducers, speed
switches, etc., (if applicable) are not by-passed or modified. Ensure
vacuum hose(s) to EGR valve is not plugged.
Fig. 7: Typical Single Diaphragm EGR Valve
Courtesy of General Motors Corp.
Dual Diaphragm EGR Valve
This type uses 2 diaphragms with different effective areas
and 2 vacuum sources. Although similar to the single diaphragm type,
the second diaphragm is added below the upper diaphragm and is rigidly
attached to the valve seat. See Fig. 8. These diaphragms form a vacuum
chamber which is connected to manifold vacuum.
During highway cruising when manifold vacuum is high in the
center chamber, manifold vacuum tends to pull the valve closed.
However, the vacuum signal applied to the top side of the upper
diaphragm overcomes the downward spring force and the manifold vacuum
pull, due to the diaphragm's larger piston. This regulates the amount
of EGR.
When manifold vacuum is low during acceleration, the higher
vacuum signal opens the valve, permitting more EGR. When manifold
vacuum is high during highway cruising, the valve is only partially
opened, reducing the amount of EGR.