fuel CHEVROLET DYNASTY 1993 Service Manual

INSTALLATION
Reverse the preceding operation
FUEL FILL DOOR
REMOVAL (FIG. 60)
(1) Open fuel fill door.
(2) Separate trunk lining from right quarter panel.
(3) Remove nuts holding fuel fill door to quarter
panel. (4) Separate fuel fill door from quarter panel open-
ing.
INSTALLATION
Reverse the preceding operation. Align to achieve
equal spacing around fuel fill door and flush to the
quarter panel.
Fig. 59 Trunk Lid Luggage Rack
Fig. 60 Fuel Fill Door
23 - 36 AA-BODY Ä

AG-VEHICLE BODY COMPONENT SERVICE INDEX
page page
A-Pillar and Roof Rail Mouldings ............. 61
Body Side Applique ....................... 60
Body Side Mouldings ...................... 60
Closure Panel Sight Shield ................. 52
Cowl Cover ............................. 54
Door Glass ............................. 58
Door Glass Opening Moulding ............... 59
Door Latch ............................. 57
Door Opening Scuff Plates ................. 61
Door Opening Weatherstrips ................ 60
Door Trim Panel ......................... 56
Floor Carpet ............................ 64
Front Center Console ..................... 64
Front Door and Hinge ..................... 56
Front Door Silencer and Water Shield ......... 56
Front End Splash Shields .................. 54
Front Fender ............................ 55
Front Seat Belts ......................... 61
Front Seats ............................. 63
Fuel Fill Door ........................... 68
Glass Run Weatherstrip ................... 58
Head Lining ............................. 65
Hood and Hinges ........................ 52
Hood Applique .......................... 54
Hood Latch and Release Cable .............. 53
Hood Latch Safety Catch .................. 54
Inside Latch Release Handle ................ 59 Lift Gate
............................... 67
Lift Gate and Fuel Fill Door Release Cables .... 69
Lift Gate Latch and Striker ................. 68
Lift Gate Lock Cylinder .................... 68
Lift Gate Prop Cylinder .................... 67
Lift Gate Spoiler ......................... 67
Lift Gate Trim ........................... 61
Lower Quarter Trim Panel .................. 61
Lower Tail Panel Trim Cover ................ 61
Manual Window Lift Plate and Guide .......... 58
Manual Window Regulator .................. 57
Manual Window Regulator .................. 58
Outside Door Latch Release Handle .......... 58
Overhead Console ........................ 65
Power Door Lock Actuator .................. 59
Power Window Regulator .................. 57
Quarter Glass Module ..................... 66
Quarter Panel Spoiler ..................... 67
Rear Seat Belts .......................... 62
Rear Seats ............................. 63
Rear Window Glass ...................... 65
Roof Seam Molding ....................... 66
Side View Mirror ......................... 59
Sunroof Lift Control ....................... 65
Tail Lamp Closure Panel ................... 69
Upper Quarter Trim Panel .................. 61
CLOSURE PANEL SIGHT SHIELD
REMOVAL (FIG. 1)
(1) Raise hood to open position.
(2) Loosen twist fasteners holding headlamp covers
to fascia. (3) Disengage hook and loop fasteners holding
sight shield to radiator closure panel. (4) Remove push-in fasteners holding sight shield
to bumper fascia. (5) Separate sight shield from vehicle.
INSTALLATION
Reverse the preceding operation.
HOOD AND HINGES
HOOD REMOVAL (FIG. 2)
(1) Raise hood to full up position.
(2) Lift front edge of cowl cover on the right side of
the windshield washer bottle and disconnect the un-
der hood lamp wire connector. (3) Mark all bolt and hinge attachment locations
with a grease pencil or other suitable device to pro-
vide reference marks for installation. When install-
ing hood, align all marks and secure bolts. The hood should be aligned to 4 mm (0.160 in.) gap to the front
fenders and flush across the top surfaces along fend-
ers. (4) Remove the top hood to hinge attaching bolts
and loosen the bottom bolts until they can be re-
moved by hand. (5) With assistance of a helper at the opposite side
of the vehicle to support the hood, remove the bottom
hood to hinge attaching bolts. Separate the hood
from the vehicle.
Fig. 1 Closure Panel Sight Shield
23 - 52 AG-BODY Ä

(3) Disconnect lift gate wire connectors and rear
window washer hose, if equipped. (4) Remove upper lift gate trim molding.
(5) Support lift gate on a suitable lifting device.
(6) Disconnect top of prop cylinders from lift gate.
(7) Mark lift gate hinge locations to assist instal-
lation an alignment of lift gate. (8) With assistance of a helper, remove bolts hold-
ing lift gate to hinge. (9) Separate lift gate from vehicle.
INSTALLATION
Reverse the preceding operation.
LIFT GATE LATCH AND STRIKER
LIFT GATE LATCH REMOVAL (FIG. 42)
(1) Raise lift gate to the full open position.
(2) Remove luggage compartment tail trim panel.
(3) Disconnect lock linkage rod from lift gate latch
arm. (4) Remove nuts holding lift gate latch to tail
panel. (5) Separate latch from tail panel and disconnect
lift gate remote release cable.
LIFT GATE LATCH INSTALLATION
LIFT GATE STRIKER REMOVAL (FIG. 42)
(1) Raise lift gate to the full open position.
(2) Remove lower lift gate trim panel.
(3) Mark lift gate striker location to assist instal-
lation. (4) Remove bolts holding lift gate striker to lift
gate. (5) Separate striker from lift gate.
LIFT GATE STRIKER INSTALLATION
Reverse the preceding operation.
LIFT GATE LOCK CYLINDER
REMOVAL (FIG. 43)
(1) Raise lift gate to the full open position.
(2) Remove luggage compartment tail trim panel.
(3) Disconnect linkage return spring (Fig. 42).
(4) Disconnect linkage rod from lift gate lock arm.
(5) Remove bolts holding lift gate lock to tail
panel. (6) Separate lock from tail panel.
INSTALLATION
Reverse the preceding operation.
FUEL FILL DOOR
REMOVAL (FIG. 44)
(1) Remove right lower quarter trim panel.
(2) Open fuel fill door.
(3) Remove nuts holding fuel fill door to quarter
panel from in luggage compartment. (4) Separate fuel fill door from vehicle.
INSTALLATION
Reverse the preceding operation
Fig. 40 Lift Gate Prop Cylinder
Fig. 41 Lift Gate
Fig. 42 Lift Gate Latch and Striker
23 - 68 AG-BODY Ä

LIFT GATE AND FUEL FILL DOOR RELEASE
CABLES
LIFT GATE AND FUEL FILL DOOR CABLES
REMOVAL (FIG. 45)
(1) Remove interior trim as necessary to gain ac-
cess to release cables. (2) Remove left front door opening scuff plate.
(3) Remove screw holding trim cover to release ca-
ble handle and separate cover from handle. (4) Remove screw holding release handle to door
sill. (5) Pry open retainer tab holding cable core end in
handle pivot. Pry cable case end from handle. (6) On fuel fill door cable, remove nut holding ca-
ble latch to fuel fill opening. (7) On lift gate latch, remove lift gate latch cover
and disconnect cable end from latch. Route cable
back through trunk lid.
LIFT GATE AND FUEL FILL DOOR CABLES INSTALLATION
Reverse the preceding operation.
TAIL LAMP CLOSURE PANEL
REMOVAL
(1) Remove lift gate opening scuff plate.
(2) Remove lift gate opening sill cover.
(3) Remove luggage compartment tail panel trim.
(4) Remove lower quarter trim panels.
Fig. 45 Lift Gate and Fuel Fill Door Release Cables
Fig. 43 Lift Gate Lock CylinderFig. 44 Fuel Fill Door
Ä AG-BODY 23 - 69

AJ-VEHICLE BODY COMPONENT SERVICE INDEX
page page
A-Pillar and Roof Rail Mouldings ............. 77
Cowl Cover ............................. 73
Cowl Panel Trim and Scuff Plates ............ 77
Door Glass ............................. 76
Door Glass Lift Plate and Guide Post ......... 76
Door Latch ............................. 75
Door Trim Panel ......................... 74
Floor Carpet ............................ 80
Front Center Console ..................... 79
Front Door and Hinge ..................... 75
Front Door Silencer and Water Shield ......... 74
Front End Splash Shields .................. 73
Front Seat Belts ......................... 78
Front Seats ............................. 78
Fuel Fill Door ........................... 84
Glass Run WeatherstripÐAJ-21 Body ......... 76
Grille .................................. 71
Grille Header Molding ..................... 71
Grille Opening Panel ...................... 71
Head Lining ............................. 81
Hood and Hinges ........................ 72
Hood Latch and Release Cable .............. 72
Inside Latch Release Handle ................ 76 Lower Grille
............................. 71
Outside Door Latch Release Handle .......... 76
Overhead Console ........................ 80
Power Door Lock Actuator .................. 76
Quarter Extension Trim Panel ............... 77
Quarter Glass Module ..................... 85
Quarter Trim Panel ....................... 77
Rear Seat Belts .......................... 78
Rear Seats ............................. 79
Rear Shelf Trim Panel ..................... 78
Rear Window Glass ...................... 81
Sun Roof Air Deflector .................... 81
Sun Roof Drain Tubes .................... 81
Sun Roof Weatherstrip .................... 81
Trunk Lid .............................. 82
Trunk Lid and Fuel Fill Door Release Cables . . . 83
Trunk Lid Hinge ......................... 82
Trunk Lid Latch .......................... 83
Trunk Lid Lock .......................... 83
Trunk Lid Luggage Rack ................... 83
Trunk Lid Torsion Bar ..................... 83
Trunk Opening Weatherstrip ................ 83
Window Regulator ........................ 75
GRILLE
REMOVAL (FIG. 1)
(1) Remove screws holding grille to header mold-
ing at top of grille. (2) Push downward on top of bumper fascia to gain
clearance for grille removal. (3) Push grille downward and pull outward.
(4) Separate grille from vehicle.
INSTALLATION
Reverse the preceding operation.
GRILLE HEADER MOLDING
REMOVAL (FIG. 1)
(1) Remove grille.
(2) Remove nuts holding header molding to grille
opening panel. (3) Separate header molding from vehicle.
INSTALLATION
Reverse the preceding operation.
LOWER GRILLE
REMOVAL (FIG. 1)
(1) Remove screws holding lower grille to fascia.
(2) Separate lower grille from vehicle.
INSTALLATION
Reverse the preceding operation.
GRILLE OPENING PANEL
REMOVAL (FIG. 2)
(1) Remove front bumper and fascia.
(2) Remove grille.
(3) Remove headlamp modules.
(4) Remove bolt holding grille opening panel to
bracket forward of radiator. (5) Raise hood and remove push-in fasteners hold-
ing sight shields to closure panel. Separate sight
shields from vehicle.
Fig. 1 Grille Assembly
Ä AJ-BODY 23 - 71

TRUNK LID TORSION BAR
REMOVAL
(1) Raise and support trunk lid in the full up posi-
tion. (2) Remove trunk lining as necessary to gain ac-
cess to torsion bars. (3) Disengage adjusting end of torsion bar from the
slot in the tension adjustment bracket. (4) Pivot torsion bar out of lift arm swivel.
(5) Disconnect torsion bar from hinge.
INSTALLATION
Reverse the preceding operation.
TRUNK LID LATCH
REMOVAL
(1) Raise trunk lid to the full up position.
(2) Remove push-in fasteners holding lining to
trunk lid as necessary. (3) Disconnect remote release cable from latch.
(4) Remove bolts holding latch to trunk lid and
separate latch from vehicle.
INSTALLATION
Insert trunk lock chill into latch release driver and
reverse the preceding operation.
TRUNK LID LOCK
REMOVAL
(1) Remove trunk lid tail light assembly. Refer to
Group 8L, Lamps for proper procedures. (2) Remove trunk latch.
(3) Remove nuts holding lock cylinder and chill to
trunk lid and separate the lock from the vehicle.
INSTALLATION
Reverse the preceding operation.
TRUNK OPENING WEATHERSTRIP
REMOVAL (FIG. 25)
(1) Raise trunk lid to the full up position.
(2) Pull the weatherstrip from the pinch flange
around the trunk opening.
INSTALLATION
A new trunk lid opening weatherstrip should be
heated to approximately 38É C (100É F) before instal-
lation. The weatherstrip butt splice should be located
at the center rear of trunk opening. Reverse the re-
moval operation. After weatherstrip has been in-
stalled, close trunk lid and allow weatherstrip to
cool. The weatherstrip will form to the trunk lid con-
tour as it cools.
TRUNK LID LUGGAGE RACK
REMOVAL (FIG. 26)
(1) Remove screws holding spoiler to trunk lid.
(2) Pry rub strip inserts from skid strips.
(3) Remove screws holding skid strips to trunk lid.
INSTALLATION
Reverse the preceding operation
TRUNK LID AND FUEL FILL DOOR RELEASE
CABLES
REMOVAL (FIG. 27)
(1) Remove interior trim as necessary to gain ac-
cess to release cables. (2) Remove left front door scuff plate.
(3) Remove screw holding trim cover to release ca-
ble handle and separate cover from handle. (4) Remove screw holding release handle to door
sill. (5) Pry open retainer tab holding cable core end in
handle pivot. Pry cable case end from handle. (6) Remove trunk lining as necessary to gain ac-
cess to the release cables.
Fig. 24 Trunk LidÐTypical
Fig. 25 Trunk Opening WeatherstripÐTypical
Ä AJ-BODY 23 - 83

(7) On fuel fill door cable, remove nut holding ca-
ble latch to fuel fill opening. (8) On trunk lid latch, remove trunk latch cover
and disconnect cable end from latch. Route cable
back through trunk lid.
INSTALLATION
Reverse the preceding operation.
FUEL FILL DOOR
REMOVAL (FIG. 28)
(1) Open fuel fill door.
(2) Separate trunk lining from right quarter panel.
(3) Remove nuts holding fuel fill door to quarter
panel. (4) Separate fuel fill door from quarter panel open-
ing.
INSTALLATION
Reverse the preceding operation. Align to achieve
equal spacing around fuel fill door and flush to the
quarter panel.
Fig. 26 Trunk Lid Luggage Rack
Fig. 27 Trunk Lid and Fuel Fill Door Release Cables
Fig. 28 Fuel Fill DoorÐTypical
23 - 84 AJ-BODY Ä

ENGINE VACUUM SCHEMATICÐ2.5L MPI FLEXIBLE FUEL AA-BODY
Ä EMISSION CONTROL SYSTEMS 25 - 7

EVAPORATION CONTROL SYSTEM
The evaporation control system prevents the emis-
sion of fuel tank vapors into the atmosphere. When fuel
evaporates in the fuel tank, the vapors pass through
vent hoses or tubes to a charcoal canister. The canister
temporarily holds the vapors. The powertrain control
module (PCM) allows intake manifold vacuum to draw
vapors into the combustion chambers during certain
operating conditions. The PCM uses the canister purge
solenoid to regulate vapor flow. On 2.2L and 2.5L TBI, 3.3L, and 3.8L engines,
manifold vacuum purges the vapors at idle as well as
off idle. These engines use a bi-level purge system. The
system uses 2 sources of vacuum remove fuel vapors
from the canister. Turbo III engines use a tri-level canister purge sys-
tem. In this system, fuel vapors are drawn into the
engine through the throttle body and air cleaner. Fuel
vapors are drawn in at closed throttle, part throttle,
and wide open throttle (in boost). The 2.5L MPI (flexible fuel AA-Body) and 3.0L have
a duty cycle purge system. The powertrain control
module PCM controls vapor flow by operating the duty
cycle EVAP purge solenoid. Refer to Duty Cycle EVAP
Purge Solenoid in this section. The evaporative system uses specially manu-
factured hoses. If they need replacement, only
use fuel resistant hose.
PRESSURE RELIEF/ROLLOVER VALVE
All vehicles have a combination pressure relief and
rollover valve. The dual function valve relieves fuel
tank pressure. The valve also prevents fuel flow
through the fuel tank vent valve hoses if the vehicle
accidentally rolls over. All vehicles pass a 360É rollover. The pressure relief valve opens at a certain pressure.
When fuel tank pressure increases above the cali-
brated pressure, the valve opens to release fuel tank
vapors pressure. The evaporative (charcoal) canister
stores the vapors. For pressure relief/rollover valve
service, refer to the Fuel Tank section of Group 14.
EVAPORATIVE CANISTER
All vehicles use a sealed, maintenance free, evapora-
tive (charcoal) canister. The canister mounts to the
inner wheel well area of the engine compartment (Fig.
4 or Fig. 5). Fuel tank pressure vents into the canister. The
canister temporarily holds the fuel vapors until intake
manifold vacuum draws them into the combustion
chamber. The canister purge solenoid purges vapors
from the canister at predetermined intervals and en-
gine conditions.
CANISTER PURGE SOLENOIDÐEXCEPT 3.0L AND
2.5L MPI
The powertrain control module (PCM) operates the
canister purge solenoid (Fig. 6). During warm-up and
for a specified period after hot starts, the PCM
grounds the purge solenoid causing it to energize.
When the PCM grounds the solenoid, vacuum does
not reach the charcoal canister valve. When the engine reaches a specified operating tem-
perature and the time delay interval has occurred,
the PCM de-energizes the solenoid by turning off the
ground. When the PCM de-energizes the solenoid,
vacuum flows to the canister purge valve. Intake
manifold vacuum purges fuel vapors through the
throttle body. The PCM also energizes the purge so-
lenoid during certain idle conditions to update the
fuel delivery calibration.
DUTY CYCLE EVAP PURGE SOLENOID
Vehicles equipped with a 3.0L engine and the Flex-
ible Fuel AA-Body with the 2.5L MPI engine use a
duty cycle EVAP purge solenoid. The duty cycle
EVAP purge solenoid regulates the rate of vapor flow
from the EVAP canister to the throttle body. The
powertrain control module operates the solenoid.
Fig. 4 Evaporative CanisterÐExcept 3.0L and 2.5L MPI
Fig. 5 Evaporative CanisterÐ3.0L and 2.5L MPI
Ä EMISSION CONTROL SYSTEMS 25 - 13

During the cold start warm-up period and the hot
start time delay, the PCM does not energize the so-
lenoid. When de-energized, no vapors are purged.
The PCM de-energizes the solenoid during open loop
operation. The engine enters closed loop operation after it
reaches a specified temperature and the time delay
ends. During closed loop operation, the PCM ener-
gizes and de-energizes the solenoid approximately 5
to 10 times per second, depending upon operating
conditions. The PCM varies the vapor flow rate by
changing solenoid pulse width. Pulse width is the
amount of time the solenoid energizes. The PCM ad-
justs solenoid pulse width based on engine air flow. A rubber boot covers the duty cycle EVAP purge
solenoid. On 2.5L MPI flexible fuel AA-body vehicles,
the solenoid and bracket attach to the EVAP canister
mounting studs (Fig. 7). On vehicles with 3.0L en-
gines, the solenoid attaches to a bracket mounted to
the right engine mount (Fig. 8). The top of the sole-
noid has the word TOP on it. The solenoid will not
operate unless it is installed correctly.
PRESSURE-VACUUM FILLER CAP
CAUTION: Remove the fuel filler cap to relieve fuel
tank pressure. Remove the cap before disconnect-
ing fuel system components or servicing the fuel
tank.
A pressure-vacuum relief cap seals the fuel tank
(Fig. 9). Tightening the cap on the fuel filler tube
forms a seal between them. The relief valves in the
cap are a safety feature. They prevent possible exces-
sive pressure or vacuum in the tank. Excessive fuel
tank pressure could be caused by a malfunction in
the system or damage to the vent lines. The seal between the cap and filler tube breaks
when the cap is removed. Removing the cap breaks
the seal and relieves fuel tank pressure. If the filler cap needs replacement, only use a sim-
ilar unit.
Fig. 6 Canister Purge SolenoidÐExcept 3.0L and 2.5L MPI
Fig. 7 Duty Cycle EVAP Purge SolenoidÐ2.5L MPIFlexible Fuel AA-Body
Fig. 8 Duty Cycle EVAP Purge SolenoidÐ3.0L Engine
Fig. 9 Pressure Vacuum Filler Cap
25 - 14 EMISSION CONTROL SYSTEMS Ä