1982 CHEVROLET CAMARO sensor

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 700
5. With the ignition
ON and the engine stopp ed, install the TPS adjustment
screw and turn the screw with a suitable tool to obtain the specified
voltage at the specified throttle posit ion with the A/C controls in the OFF
position. a. 2.8L - 0.30 volts at curb idle position
b. 5.0L - 0.40 volts at curb idle position
6. After the adjustment has been made, install a new plug kit (supplied in
the service kits), into the air horn. Driv e the plug into place until it is flush
with the raised pump lever boss on t he casting. Clear trouble code
memory after adjustment.
The plug must be installed to retain the TPS adjustment screw setting. If a plug
kit is not available, remove the T PS adjusting screw and apply thread sealer
adhesive X-10 or equivalent to the scr ew threads. Now repeat the TPS
adjustment procedure to obtain the correct TPS voltage.

Fig. 31: Throttle position sensor adjus ting screw location on E2SE carburetors

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 701

Fig. 32: Throttle position sensor adjusting screw location on E4ME/E4MC
carburetors
REMOVAL & INSTALLATION
Always replace all internal gaskets that are removed. Flooding, stumble on
acceleration and other performance comp laints are in many instances, caused
by presence of dirt, water, or other foreign matter in carburetor. To aid in
diagnosis, carburetor should be carefully removed from engine without draining
fuel from bowl. Contents of fuel bowl may then be examined for contamination
as carburetor is disassembl ed. Check the fuel filter.
ROCHESTER E2SE 1. Remove air cleaner and gasket.
2. Disconnect fuel pipe and vacuum lines.
3. Disconnect electrical connectors.
4. Disconnect accelerator linkage.
5. If equipped with automatic transmi ssion, disconnect downshift cable.
6. If equipped with cruise c ontrol, disconnect linkage.
7. Remove carburetor attaching bolts.
8. Remove carburetor and EF E heater/insulator (if used).
9. Inspect EFE heater/insulator for damage. Be certain throttle body and
EFE heater/insulator surfaces are clean.
To install: 10. Install EFE heater/insulator.
11. Install carburetor and tighten nuts alternately to the correct torque.
12. Connect downshift cable, as required.
13. Attach the cruise cont rol cable, as required.
14. Connect accelerator linkage.
15. Connect electrical connections.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 711
THROTTLE BODY INJECTION SYSTEM

SYSTEM DESCRIPTION
The throttle body injection (TBI) system used on 2.5L (VIN 2) and 5.0L (VIN E)
engines is centrally located
on the intake manifold. Its function is to supply the
correct air/fuel mixture to the engine, as directed by the Engine Control Module
(ECM).
The TBI unit consists of two relatively simple casting assemblies: a throttle body
and a fuel metering assembly. Components include, a pressure regulator, idle
air control valve, fuel injector(s), thro ttle position sensor, fuel inlet and a fuel
return fitting.
The Throttle Body Injection identifi cation number is stamped on the lower
mounting flange located near the TPS. Th e number is in alphabetical code and
should be noted before servicing the unit.
An oxygen sensor in the exhaust syst em functions to provide feedback
information to the ECM as to oxygen content in the exhaust. The ECM then
uses this information to modify fuel de livery to achieve as near as possible an
ideal air/fuel ratio of 14.7 :1. This ratio permits the ca talytic converter to become
more effective in reducing emissions wh ile providing acceptable driveability.
Should you encounter any type of engine performance problem, have a
complete CCC system test performed by a qualified, professional technician. If
the fault lies in the injection system, you can use the following procedures to
remove the TBI unit and replace the defective component(s).
RELIEVING FUEL SYSTEM PRESSURE
1. Disconnect the negative battery cable to prevent fuel discharge if the key
is accidentally turned to the RUN position.
2. Loosen the fuel filler cap to relieve fuel tank pressure and do not tighten
until service has been completed.
3. Fuel system pressure is automatic ally relieved when the engine is turned
OFF. No further action is necessary.
When disconnecting fuel lines, there ma y still be a small amount of fuel
released. Cover the fuel line connection wi th a shop cloth to collect the fuel,
then place the cloth in an approved container.
ELECTRIC FUEL PUMP
REMOVAL & INSTALLATION
The fuel pump is part of t he fuel sender assembly located inside the fuel tank.
1. Release the fuel syst em pressure and disconnec t the negative battery
cable.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 714
4. Start the car and observe the fuel
pressure reading. It should be 9-13 psi
(62-90 kPa).
5. Relieve the fuel pressure.
6. Remove the fuel pressure gauge.
7. Reinstall the fuel line.
8. Start the car and che ck for fuel leaks.
9. Remove plug covering THERMAC va cuum port on the TBI and install the
air cleaner.
THROTTLE BODY
REMOVAL & INSTALLATION 1. Relieve the fuel system pressure.
2. Disconnect the THERMAC hose from the engine fitting and remove the
air cleaner.
3. Detach the electrical connectors at the idle air control, throttle position
sensor, and the injector.
4. Disconnect the throttle linkage, re turn spring, and cruise control (if
equipped).
5. Disconnect the throttle body vacuum hoses, fuel supply and fuel return
lines.
6. Disconnect the 3 bolts securing the throttle body and remove the throttle
body.
7. To install, reverse the removal procedures. Replace the manifold gasket
and O-rings.
8. Perform the minimum idle speed adjustment, if necessary.

Fig. 1: Single injector TBI unit

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 721
8. The idle speed should be 450-500 rpm, adjust as necessary.
WARNING - Correct minimum idle speed adj ustment is critical to vehicle
performance and component durability. Incorrect minimum idle speed
adjustment (too high) will caus e the IAC valve pintle to constantly bottom in it's
seat and result in early valve failure. If minimum idle speed is adjusted too low,
the vehicle may not start in cold weather or may stall during warm-up.
Turn the ignition OFF and reconnect the IAC motor connector.
9. Reconnect the distributor set-timing connector.
10. Use silicone sealant to co ver the throttle stop screw.
THROTTLE POSITION SENSOR (TPS)
1982-1983 2.5L TBI engines ar e equipped with an adjustable throttle position
sensor. This procedure should only be performed after replacing the TPS or
diagnosis leads to incorrect TPS adjustment.
1. Remove the throttle position sensor connector and install three jumper wires between the connector and the s ensor. Connect a digital voltmeter
to terminals B and C.
2. Turn the ignition ON. It should display bet ween 0.45-0.60 volts.
3. Adjust the TPS, if necessary, by loosening the attaching screws and
rotating the TPS.
4. Tighten the screws, remove the jumper wires with the ignition OFF and
reconnect the harness connector.
5. Start the engine and check fo r proper idle operation.

Fig. 7: TPS adjustment

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 723

Fig. 2: Fuel pressure regulator assembly
THROTTLE POSITION SENSOR (TPS)
REMOVAL & INSTALLATION 1. Remove the air cleaner.
2. Disconnect the electrical connector.
3. Remove the TPS attaching screws and lockwashers.
4. Remove the TPS.
To install: 5. Install the throttle position sensor. On 2.5L engines, make sure the TPS pickup lever is located above the tang on the throttle actuator lever. On
5.0L engines, line up the TPS lever with the TPS drive lever on the
throttle body.
6. Install the TPS attaching screws.
7. Adjust the TPS volt age, if applicable.
8. Reconnect the electrical connector.
9. Install the air cleaner.
IDLE AIR CONTROL (IAC) VALVE
REMOVAL & INSTALLATION 1. Unplug the electrical connector from idle air control valve.
2. Remove the idle air control valve.
To install: 3. Before installing the idle air contro l valve, measure the distance that the
valve is extended. Measurement s hould be made from the motor housing
to the end of the cone. It should not exceed 28.5mm (1
1/8 in.), or damage
to the valve may occur when installed.
4. Identify the replacement IAC valve as being either Type 1 (with collar at
electric terminal end) or Type 2 (without collar). If measuring distance is
greater than specified abov e, proceed as follows:
• Type 1: Use finger pressure to slowly retract the pintle.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 727
To install:
9. Replacement of the manifold cover or either throttle body requires throttle
valve synchronizing and checking of the throttle rod alignment (see
"Preliminary Adjustments"). Before installing the replacement throttle
body unit(s) on the engine, perform the following steps:
a. If the tamper resistant plugs co vering the throttle stop screws are
in place, remove the plugs.
b. If the front TBI unit throttle syn chronizing screw has a welded
retaining collar, grind off the weld.
c. Block possible movement of the throttle lever, relieving the force
of the heavy spring against the throttle synchronizing screw. This
prevents the levers from coming into contact.
If the lever is not blocked before the thro ttle synchronizing screw is removed,
the screw may be damaged, and reinstallation will be accomplished only with
great difficulty.
d. Remove the synchronizing screw and collar. Discard the collar and reinstall the screw. The blocking from the throttle lever (installed in the
previous step) can now be removed.
CAUTION - The collar must be removed to prevent possible interference with
the air cleaner. Failure to do so c ould result in personal injury
10. Use new gaskets and tighten the TB I bolts to 120-168 inch lbs. (13-19
Nm) during installation.
11. Perform the preliminary adjustm ents. These procedures must be
followed before further assembly.
12. Reconnect the fuel lines to the TBI units. Use a backup wrench to
prevent the nuts from tu rning in the TBI unit.
13. Reconnect the throttle cable and detent cable.
14. Reconnect all related vacuum lines.
15. Reconnect the electrical connectors.
16. With the engine OFF, depress the accelerator pedal to the floor and
release. Check for free return of the pedal.
17. Check the throttle position sensor voltage and adjust if necessary.
18. Perform the Minimum Idle and Thro ttle Valve Synchronization adjustment
procedures.
Rear Unit 1. Relieve the fuel system pressure.
2. Remove the air cleaner assembly, noting the connection points of the
vacuum lines.
3. Disconnect the electrical connectors at the injector, idle air control motor,
and throttle position sensor.
4. Disconnect the vacuum lines from the TBI unit, noting the connection
points. During installation, refer to the underhood emission control
information decal for vacuum line routing information.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 729
17. Check the throttle position sensor voltage and adjust if necessary.
18. Perform the Minimum Idle and Thro
ttle Valve Synchronization adjustment
procedures.
INJECTOR REPLACEMENT
The removal and installation procedures fo r the Crossfire injection system's fuel
injector is identical to the Throttle Bo dy Injection (TBI) system. Please refer to
the TBI fuel injector procedures earlier in this repair guide.
ADJUSTMENTS
PRELIMINARY ADJUSTMENTS
The preliminary adjustments are performed if tampering with the idle speed or
synchronization is evident and when either of the throttle bodies or the manifold
cover have been replaced. They must be performed BEFORE the Minimum Idle
and Throttle Valve Synchronizing procedure.
THROTTLE VALVE SYNCHRONIZING
1. Turn BOTH front and rear unit throttle stop screws counterclockwise enough to break contact with the related throttle lever tangs.
2. Adjust the throttle synchronizing scr ew to allow BOTH throttle valves to
close. The throttle rod end bearing w ill move freely on the front unit
throttle lever stud when both valves are closed.
3. Turn the front unit th rottle stop screw clockwise slowly until it makes
contact with the throttle lever tang. Turn the screw clockwise an
additional
1/4 turn.
4. Turn the rear unit throttle stop screw clockwise slowly until it makes
contact with the throttle lever t ang. Turn the screw an additional
1/2 turn.

Fig. 1: Blocking the throttle levers