1988 PONTIAC FIERO Service Repair Manual

2H-8 STATIONARY GLASS - F STYLE
e The soldering iron tip should be coated with the
solder and only enough solder to ensure a
solder beforehand. Use only enough heat to melt complete repair.
e Do
not overheat the wire when resoldering it to
the bus bar.

UNDERBODY-F STYLE 3H-1
SECTION 3H
UNDERBODY
CONTENTS
General Body Construction .......................................................................................................... 3H- 1
Alignment Checking ................................................................................................................ 3H- I
Floor Pan Insulators ...................... .. ........................................................................................ 3H- 1
Floor Carpets ................................................................................................................................. 3H-2
metric-to-English dimensional conversion data.
Dimensions to gage holes are measured to dead center
GENERAL BODY CONSTRUCTION of the holes and flush to adjacent surface metal unless
Information in this section pertains to unitized otherwise specified.
body construction which
incorporates integral front
and rear frame side rails. FLOOR PAN INSULATORS
Consideration must be given when checking
underbody dimensions. The engine front suspension
lower control arms are supported by a cross member.
The cross member, in turn, is bolted to the body at six
locations
-- three on each side of the engine front
compartment lower rails. Mounting provisions for the
front suspension system are shared by chassis
components (suspension lower control arms and cross
member) and body components (engine compartment
side panels). The suspension strut towers must be
dimensionally correct in relation to the remainder of
the underbody in order to maintain specified
suspension strut and
castedcamber angles.
Since the individual underbody components also
contribute directly to the overall strength of the body,
it is essential that proper welding techniques be
observed during service repair operations. The
underbody components should be properly sealed and
rustproofed whenever body repair operations destroy
or damage the original sealing and rustproofing. When
rustproofing critical underbody components, it is
essential that a good quality type of air dry primer be
used (such as corrosion resistant chromate or
equivalent material). It is not advisable to use
combination type primer-surfacers.
ALIGNMENT CHECKING
An accurate method of determining the
alignment of the underbody utilizes a measuring tram
gage. The tram gage set required to perform the
recommended measuring checks must include a
vertical pointer capable of reaching 914 mm (36").
Two types of measurements can be made with
a
tram gage: direct point-to-point measurements and
measurements calculated on a horizontal
vlane (datum
line) parallel to the underbody. In the
latter case, the
vertical pointers must be set as specified for each point
to be measured (Fig. 3-1).
Point-to-point measurements are generally taken
only on engine compartment components (Fig. 3-2)
and simply require the vertical pointers to be equally
set.
Figure #3-3 describes the alphabetically
identified points of measurement. Figure 3-4 provides Floor
pan insulators have been designed for the
higher floor pan temperatures that result from the use
of the catalytic converter in the exhaust system.
Therefore, when servicing a vehicle in the field, it is
essential that any insulators that may have been
disturbed or removed be reinstalled in the original
sequence and location. Also, if it becomes necessary to
replace an insulator, the material specified for that
particular location on the floor pan must be used. The
types of materials are listed below. Items 1 and
2 are
rolled stock and are ordered by linear foot and cut to
fit.
1. Insulator floor pan
(cerra blanket thermal) -
consists of 10 mm (3/8") thick aluminum silica
(type 1).
2. Insulator floor pan (amberlite) - consists of 10
mm
(3/8") thick resinated fibers (type 2).
3. Insulator floor pan sheet (phenolic bonded fiber
glass)
305 mm x 457 mm (12" x 18") cut to size,
(type 3).
All of the above materials must meet
Motor Vehicle Safety Standard No. 302 for
flammability.
When servicing or replacing interior insulators,
the following instructions must be observed:
1. Insulators must be installed in the original
position and sequence. Pieces should be butted
together in order to avoid gapping or
overlapping.
2. If it is necessary to replace an insulator, the
specified material must be used.
3. Use original
part to determine the amount of
replacement material required and as a template
for cutting and fitting the new piece to the floor
pan.
4. When installing insulator, do not enlarge cutouts
or holes that are used for the attachment of
interior components such as seats or seat belts.
5. Cross body harnesses for interior components
such as power seats, lap belt warning light and
buzzer or rear speakers must be routed over the
floor pan insulators in the original location and
clipped in place.

3H-2 UNDERBODY-F STYLE
Fig. 3-1 - Underbody Horizontal and Vertical Dimensions
6. Spray-on deadeners and trim adhesives should 1. Front seats
not be applied to the top of the floor pan at area
2, Front seat belts directly over the catalytic converter or muffler(s).
Any insulator service repair or 3. seat cushion
re~laeement should be the same thickness, 4. Left and right shroud side trim finishing panels size and location as original installation in
Car. 5. Left and right shoulder harness floor attachments
6. Center pillar trim finishing panels
FLOOR CARPETS 7. Console assembly (if applicable)
All floor carpets consist of a molded one-piece
*, Carpet retainers carpet over both front and rear floor pan. The
following items must be removed to take out the carpet: To
install, reverse removal operations.

UNDERBODY-F STYLE 3H-3
Fig. 3-2 - Suspension Strut and Upper Rail Dimensions
Front edge of 24 mm (15/16") " ( hole
Leading edge of upper tie
( bar
C Front edge of 16 mm (5/811) gage hole (front edge center
of slot on right side)
I
Front edge of outboard strut
mounting slot
I
Leading edge of lower tie
bar at corner
F Center of 9 mm (23/6411) hole
in rail depression
G Center of 9 mm (23/6411) hole
in rail depression
H Center of 16 mm (5/811) gage / hole
I Front edge of 18 mm (11/16'~) gage hole
J Center of 16 mm (5/811) hole
Front edge of
18 mm (11/16") I hole Lower
surface of engine
compartment rail
None
Lower
compar
(slot surface
of engine
.tment rail at hole
on right side)
Lower surfaces of strut
tower 'at slot
None
None
None
Lower surface of reinforce-
ment rear of rail at hole
Lower surface of rail at
hole
Lower surface of rail at
hole
I Lower surface of rail at hole Eng
ine compartment rai
1 forward of lower tie bar
Engine compartment bar,
upper rai
1
Engine compartment rail,
forward of suspension
pocket
Shock-strut tower
Engine compartment bar
lower rail
En ine compartment upper
si e rail
I%
Engine compartment upper
side rail
Floor pan reinforcement
behind engine compartment
rai
1
Rear longitudinal rail
Shock mounting hole rear
longitudinal rail
I
Rear longitudinal rail,
forward of 25 mm (1") hole 2617
Fig. 3-3 - Underbody Horizontal and Vertical Locations

3H-4 UNDERBODY-F STYLE
D IHENS ION
A to A A to C B to G C to C C to A C to E C to H Right C to H Left D to D
D to G D to I F to F F to G
G to G G to D H to H H Right to C Left H Left to C Right H to I I to I I to D I Right to H Left I Left to H Right I to J
J to J J to I J to K Right J to K Left K to K K Right to J Left K Left to J Right
=ig. 3-4 - Metric-to-English Dimension Conversion Chart

FRONT END - F STYLE 41-1-1
SECTION 4H
FRONT END
NOTICE: The anti-theft label found on some major sheet metal, engines, and transmissions must be masked
prior to painting, rustproofing, undercoating, etc. The
mask must be removed following the above operations.
Failure to keep the label clean and readable may result in liability for violation of Federal Vehicle Theft Prevention
Standard, and subject the vehicle owner to possible suspicion that the part was stolen.
CONTENTS
.............................................................................................................. Body Ventilation 4H- 1
Shroud Side Trim Finishing Panel ................................................................................ 4H- 1
Pressure Relief Valve .................................................................................................. 4H- 1
Hood Latch Release Cable ............................................................................................ 4H- 1
The body ventilation system on styles without air
conditioning consists of a fresh air intake located at the
front plenum chamber. Air enters the front plenum
chamber through an air intake grille screen (Fig.
1).
Air passes through the plenum chamber to air outlet
doors. When ventilation controls are operated, air
enters past the doors and into the body from outlets in
the dash panel. The air then passes through the body,
around the rear seat, into the rear compartment to the
rear quarters and leaves the body passing through the
pressure relief valves on the rear body lock pillars (Fig.
4). For complete instructions on operation of the body
ventilation system, refer to the owner's manual.
Water entering the plenum chamber is drained
through openings provided for that purpose.
FRONT END SEALING
All potential waterleak locations are sealed in
production with high quality durable sealers. Should it
be necessary to reseal specific areas, a high quality
medium-bodied sealer which will remain flexible after
curing and can be painted should be used.
SHROUD SIDE TRIM FINISHING PANEL
Removal and Installation
1. Remove shroud side trim finishing panel screws
(Fig. 2).
2. Pull down and rearward on trim finishing panel
to release hood cable handle from slot on left side.
On right side, pull rearward to remove panel from
windshield lower side garnish (Figs.
2 and 3).
3. To install, reverse removal procedures.
PRESSURE RELIEF VALVE
The pressure relief valves are attached to rear
lock pillars (in door opening below belt) with screws.
Figure
4 shows pressure relief valve installations.
Removal and Installation
1. Remove louver-to-lock pillar screw located in the
door opening (Fig.
4).
2. Slide louver up to disengage hook-type attaching
clip to complete removal.
3. To install, reverse removal procedure.
HOOD LATCH RELEASE CABLE
The one-piece hood latch release cable includes
pull handle, control cable and housing. The control
cable is installed through the left shroud side trim
panel. A sealing grommet attached to the dash panel
completes the assembly (Figs. 2 and
5).
Removal and Installation
The shroud side finishing panels are designed
with an integral hinge pillar pinchweld finishing lace.
The left side has a cutout slot for the hood release cable
handle. There is no need to remove the cable assembly
2.
when removing the trim finishing panel. The trim 3.
finishing panel is secured to the side shroud with
self-tapping attaching screws.
4.
Raise hood and disengage cable from hood latch
assembly. Block latch to prevent hood locking
until cable has been reinstalled.
Remove left shroud side trim panel.
Disengage control assembly housing from cutout
of trim panel and remove
cable assembly from
panel.
To install, reverse the removal procedure.

4H-2 FRONT END - F STYLE
Fig. I-Air Entrance into Plenum Chamber
Fig. 3-Windshield Lower Side Garnish Molding
Fig. 2-Shroud Side Trim Finishing Panel

FRONT END - F STYLE 4W-3
Fig. 4-Pressure Relief Valve
I SECTION C-C I
Fig. 5-Hood Latch Release Cable Routing