B23E Engine (Canada Only) W/ Automatic Transmission

Fig. 85 CHECK E.G.R. VALVE:

SYSTEM OPERATION CHECK:

The E.G.R. valve should only open at part throttle when the engine is at operating temperature. To check the E.G.R. valve, observe the movement of the link rod at different engine speeds and temperatures. Fig. 85.

NOTE:
It is difficult to determine whether the valve closes completely. The only way to check this is to remove the pipe between the valve and the intake manifold and to feel if the valve is leaking.

A valve which is open when the engine is idling results in uneven idling, and the engine may stall.
Check that the E.G.R. valve:

1. is closed at all engine speeds with cold engine, i.e., coolant temperature below 55°C (130°F).
2. opens at part throttle with hot engine, i.e., coolant temperatures above 60°C (l4O°F).
3. Vehicles with delay valve: E.G.R. valve opens approx. 2 seconds after engine is accelerated.
4. closes when the engine speed drops to an idle.

IMPORTANT:
EGR valves exist in various designs (different opening pressures, flow).
Ensure that correct valve is used.
The valves are marked with the Part Number.



CHECKING INDIVIDUAL COMPONENTS:

Hoses and connections:

Check that the vacuum hoses are in good condition, correctly connected and that they are not pinched or blocked.

Fig. 90 CHECK THERMOSTAT VALVE:

Thermostat valve:

When engine is at operating temperature and off, disconnect thermostat valve hoses from intake manifold and connection "R" from vacuum amplifier.
Blow through the thermostat valve to check if it is open. Fig. 90.
If valve is still closed, replace and retest with new thermostat valve.

Fig. 91 CHECK E.G.R. VALVE:

EGR valve check:

Disconnect vacuum hose from valve.
Connect a vacuum pump to the E.G.R. valve. Apply vacuum to the valve and see if E.G.R. valve opens. If E.G.R. valve does not open, replace and retest with new valve. Fig. 91.
Reconnect vacuum hose to E.G.R. valve.

Fig. 92 CHECK VACUUM AMPLIFIER:

Vacuum amplifier check:

Disconnect vacuum hose marked "V" from the vacuum amplifier.
Start engine and run until the thermostat opens.
Connect a vacuum pump to the vacuum amplifier at connection "V" and apply vacuum. E.G.R. valve should open if the amplifier is working correctly.
If E.G.R. valve does not open, turn off engine, replace vacuum amplifier and retest as described above. Fig. 92.
Reconnect vacuum hose "V".

Fig. 93 CHECK AIR FILTER INLET:

Air filter inlet check:

Check that air filter inlet is leak proof. Leaks would cause a change in venturi vacuum. This would influence the operation of the E.G.R. system.
Check air filter housing, inlet hose and air filter. Fig. 93.
Repair or replace defective parts as needed.