Egr System Forward Delay Valve Functional Test; Forward Delay Valve Test - Jeep 1987 Wrangler Workshop Manual

AH
ENGINES
AH
EXHAUST GAS RECIRCULATION SYSTEM
EGR SYSTEM FORWARD DELAY VALVE
FUNCTIONAL TEST
Apply a constant vacuum of 34 kPa (10 in. Hg) to
the black side of the delay valve.
Connect one end of a 61cm (24-in) section of
vacuum to the vacuum gauge and the other end
to the colored side of the delay valve.
Observe the time in seconds for the gauge
pointer to move from 0 - 27 kPa (0 - 8-in. Hg)
vacuum.
NOTE: When testing a delay valve, care must
be exercised to prevent oil or dirt from entering
the valve because this will impair its functioning.
Replace the delay valve if the functional test
indicated it to be defective. Otherwise, install the
delay valve in its original position.
The minimum and maximum time for each valve
type to reach 27 kPa (8-in. Hg) is listed in the
Forward Delay Valve Test chart.
Forward Delay Valve Test
COLOR
PART NUMBER
TIME IN SEC.
COLOR
PART NUMBER
MIN.
M A X .
BLK/GRAY
323 5261 10 ± 2
BLK/BROWN 323 7293 20 ± 4
BLK/WHITE 323 1379 63.5 ± 1 3 . 5
BLK/YELLOW
323 1118
100 ± 2 0
BLK/PURPLE 323 6284 4 ± 0 . 8
BLK/GREEN 323 0422 200 ± 4 0
BLK/ORANGE
323 9134
2 ± 0 . 5
90840
B-242