6. CHECK EGR VALVE
(a) Apply vacuum directly to the EGr valve with the engine idling.
(b) Check that the engine runs rough or dies.
(c) Reconnect the vacuum hoses to the proper locations.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION,
SYSTEM IS NORMAL; OTHERWISE INSPECT EACH
PART
EGR VACUUM MODULATOR
INSPECTION
EG08R–01
CHECK EGR VACUUM MODULATOR OPERATION
(a) Disconnect the vacuum hoses from ports P, Q and R of the
EGR vacuum modulator.
(b) Block ports P and R with your finger.
(c) Blow air into port Q, and check that the air passes through to
the air filter side freely.
(d) Start the engine, and maintain speed at 3,500 rpm.
(e) Repeat the above test. Check that there is a strong
resistance to air flow.
(f) Reconnect the vacuum hoses to the proper locations.
EGR VALVE INSPECTION
EG08S–01
1. REMOVE EGR VALVE
Check for sticking and heavy carbon deposits.
If a problem is found, replace the valve.
2. REINSTALL EGR VALVE WITH NEW GASKET
Torque: 18 N⋅m (185 kgf⋅cm, 13 ft⋅lbf)
–ENGINE TROUBLESHOOTING EMISSION CONTROL SYSTEMS
EG–153
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