Purge Control System Check; Purge Port Vacuum Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

17-8
ENGINE AND EMISSION CONTROL -
<4G6>
Red stripe
Plug
Vacuum hose
(with red stripe)
Negative
pressure
Engine r/min
Emission Control System <MPI>

PURGE CONTROL SYSTEM CHECK

1. Disconnect the vacuum hose (red stripe) from the throttle
body and connect it to a hand vacuum pump.
2. Plug the nipple from which the vacuum hose was removed.
3. When the engine is cold or hot, apply a vacuum while
the engine is idling, and check the condition of the engine
and the vacuum.
When engine is cold
(Engine coolant temperature: 40_C or less)
Vacuum Engine condition
53 kPa 3,000 r/min
When engine is hot
(Engine coolant temperature: 80_C or higher)
Vacuum Engine condition
53 kPa At idle
3,000 r/min
NOTE
*: The vacuum will leak continuously if the atmospheric
pressure is approximately 77 kPa or less, or the temperature
of the intake air is approximately 50_C or higher.

PURGE PORT VACUUM CHECK

1. Disconnect the vacuum hose (with red stripe) from the
throttle body purge nipple, and connect a hand vacuum
pump to the nipple.
2. Start the engine.
3. Check that the negative pressure increases in proportion
to the engine speed when the engine speed is increased.
4. If the negative pressure does not increase, the port is
probably blocked and should be cleaned.
Normal condition
Vacuum is
maintained
Normal condition
Vacuum is
maintained
Vacuum will leak for
approximately 3
minutes after the
engine is started.
After 3 minutes have
passed, the vacuum
will be maintained
momentarily, after
which it will again
leak.*