Manifold Vacuum Check - Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement

Ventilation hose
Vacuum gauge
PCV valve
ENGINE <4G9> –
7. Measure the compression pressure for all the cylinders,
and check that the pressure differences of the cylinders
are below the limit.
Limit: Max. 100 kPa
8. If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repeat the
operations in steps 6 and 7.
(1) If the compression increases after oil is added, the
(2) If the compression does not rise after oil is added,
9. Connect the crank angle sensor connector.
10. Install the spark plugs and ignition coils.
11. Use the MUT-II to erase the diagnosis codes.
NOTE
This will erase the diagnosis code resulting from the crank
angle sensor connector being disconnected.

MANIFOLD VACUUM CHECK

1. Before inspection, set the vehicle to the pre-inspection
condition.
2. Disconnect the ventilation hose from the positive crankcase
ventilation (PCV) valve, and then connect a vacuum gauge
to the ventilation hose.
3. Check the intake manifold vacuum while the engine is
idling.
Limit: Min. 34 kPa
On-vehicle Service
cause of the malfunction is a worn or damaged piston
ring and/or cylinder inner surface.
the cause is a burnt or defective valve seat, or pressure
is leaking from the gasket.
11A-13