Chapter 6 Emissions control systems
6-13
7.18 Disconnect the green-striped hose from the therm0 valve
Green strr pe hose
connected to therm0 valve
7.20 To check for proper operation of the EGR control valve,
hook up a hand-operated vacuum pump/gauge to the carburetor
side of the valve
.
7.31 Disconnect the vacuum pump from the three-way terminal,
remove the terminal and connect the vacuum pump directly to the
EGR valve
and should be replaced with a new one.
26 If no movement was felt, allow the engine to warm up until the coolant
7.19
Apply a vacuum to the therm0 valve
7.28 Disconnect the vacuum hose with the green stripe from the
EGR valve and connect a hand-operated vacuum pump/gauge
into the line with a three-way terminal
temperature exceeds 104degrees F.
27 Repeat the test outlined in Step 2. This time movement of the dia-
phragm should occur. If no movement is felt, the EGR control valve, the
thermal valve and the vacuum hoses should be checked for leaks and oth-
er defects.
i =~.
Fuel-injected models
EGR
system inspection
Refer to illustrations 7.28 and 7.31
28 Disconnect the vacuum hose with the green. stripe from the EGR
valve and connect a hand-operated vacuum pump/gauge into the line with
a three-way terminal (see illustration).
29 Start the engine. While its still cold, press down on the accelerator
pedal abruptly and race the engine- there should be no vacuum indicated
(atmospheric pressure).
30 After the engine is warmed up, press down suddenly on the accelera-
tor again -the indicated vacuum should rise momentarily to about 5.9-
in-Hg.
31 Disconnect the vacuum pump from the three-way terminal, remove
the terminal and connect the vacuum pump directly to the EGR valve (see
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