Daihatsu F300 Service Manual page 1130

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(2) Dis-connect the plug from vacuum hose.
Connect the MitgVac to the vacuum advancer of distributor,
check the ignition advance timing, while vacuum is applied.
EGR SYSTEM (For US'83)
(1) Maintain the engine speed approximately at 3500 r.p.m.
(2) While maintaining the engine speed at this level, clog the
vacuum hose between the EGR valve and the EGR
modulator (port 0).
(3) Fully close the accelerator while the hose is held clogged .
Ensure that the engine stalls .
MA-15
MAINTENANCE
WFE90-MA039