1982 CHEVROLET CAMARO Repair Guide

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 537
ENGINE CONTROLS

EMISSION CONTROLS

CRANKCASE VENTILATION SYSTEM
OPERATION
The Positive Crankcase Ventilation (PCV ) system is used to control crankcase
blow-by vapors. As the engine is running, clean, filtered air is drawn through the
air filter and into the crankcase. As the air passes through the crankca\
se, it
picks up the combustion gases and carries them out of the crankcase, through
the PCV valve, and into the induction system . As they enter the intake manifold,
they are drawn into the combustion chamber where they are reburned.
The most critical component in the system is the PCV valve. This valve controls
the amount of gases which are recycled into the combustion chamber. At low
engine speeds, the valve is partially clos ed, limiting the flow of gases into the
intake manifold. As engine speed incr eases, the valve opens to admit greater
quantities of gases into the intake manifold. If the PCV valve becomes clogged,
the system is designed to allow excessive amounts of blow-by gases to back
flow through the crankcase tube into the air cleaner to be consumed by normal
combustion.

Fig. 1: PCV flow on 4, 6 and 8cylinder engines
SERVICE
Inspect the PCV system hose and connecti ons at each tune-up and replace any
deteriorated hoses. Check the PCV valve at every tune-up and replace it at
30,000 mile intervals.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 538
TESTING
1. Remove the PCV valve from the intake manifold or valve cover.
2. Run the engine at idle.
3. Place your thumb over the end of the valve. Check for vacuum. If there is
no vacuum at the valve, check fo r plugged valve or vacuum lines.

Fig. 2: Check the PCV valve for vacuum at idle
4. Shut off the engine. Shake the valv e and listen for the rattle. If valve
doesn't rattle, replace it.
REMOVAL & INSTALLATION
PCV SYSTEM FILTER
1. To replace the PCV filter discon nect the hose, if equipped, attached to
the filter at the air cl eaner and remove the air cleaner cover. Slide the
spring clamp off of the filter and re move it from the air cleaner.
2. Inspect the rubber grommet in the valve cover and the hose for signs of \
deterioration, brittleness and cracking. Replace as necessary.
3. Installation is the reverse of removal.

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 539
PCV VALVE
1. Disconnect the hose or pi pe from the PCV valve.
2. Gently pull the PCV valv e out of the grommet in the valve cover or intake
manifold.
3. Installation is the reverse of removal.

Fig. 3: PCV system on Tuned Port Injection equipped engines

Fig. 4: PCV filter location on most carbureted and throttle body injected engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 540

Fig. 5: Most PCV valves are lo cated in the rocker arm covers

Fig. 6: Once the valve has been withdraw n from the rocker cover, it can be
removed from the hose and replaced

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 541
EVAPORATIVE EMISS
ION CONTROLS
OPERATION
This system reduces the amount of gasoline vapors escaping into the
atmosphere. Some models em ploy a purge control solenoid which is controlled
by the ECM, to open and close the EE C system. Other models use a canister
mounted vacuum purge valve; when the engine vacuum reaches a certain
pressure, the valve opens allowing the gas vapors to be drawn off to the
carburetor for burning.
Carbureted models use an exhaust tube fr om the float bowl to the charcoal
canister; fuel injected models eliminate the fuel bowl tube (as no float bowl is
used on fuel injection systems). Fuel vapor s from the gas tank travel from the
tank to the vapor canister , where they are collected. Although the system varies
from vehicle-to-vehicle, the operat ions are basically the same.

Fig. 1: Evaporative Emission Cont rol (EEC) System - 2.5L engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 542

Fig. 2: EEC system - 2.8L carbureted engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 543

Fig. 3: EEC system on TPI and TBI V6/V8 engines

Fig. 4: EEC system on carbureted V8 engines

GM – CAMARO 1982-1992 – Repair Guide (Checked by WxMax) 544
TESTING
TANK PRESSURE CONTROL VALVE
1. Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg. (51 kPa)
through the control vacuum signal tube to the purge valve diaphragm. If
the diaphragm does not hold 5 in. Hg . at least for 10 seconds, the
diaphragm is leaking. Repl ace the control valve.
2. With the vacuum still applied to t he control vacuum tube, attach a short
piece of hose to the valve's tank tube side and blow into the hose. Air \
should pass through the valve. If it does not, replace the control valve.
REMOVAL & INSTALLATION
CANISTER 1. Disconnect the negative battery cable.
2. Loosen the screw holding the c anister retaining bracket.
3. Remove the canister.
4. Tag and disconnect the hoses leading from the canister.
To install: 5. Connect the hoses to the cani ster according to the tags.
6. Install the canister into the retaining bracket.
7. Tighten the screw holding the c anister retaining bracket.
8. Reconnect the negative battery cable.

Fig. 5: A common EEC canister location