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

11C-12
Vacuum gauge
ENGINE <4G6-MPI> -
(2) If the compression does not rise after oil is added,
10. Connect the crank angle sensor connector.
11. Install the spark plugs and spark plug cables.
12. 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. Attach a three-way union to the vacuum hose between
the fuel pressure regulator and the air intake plenum,
and connect a vacuum gauge.
3. Start the engine and check that idle speed is within
standard value. Then read off the vacuum gauge.
Limit: Min. 69 kPa

LASH ADJUSTER CHECK

If an abnormal noise (knocking) that seems to be coming
from the lash adjuster is heard after starting the engine and
does not stop, carry out the following check.
NOTE
(1) The abnormal noise which is caused by a problem
(2) If there is a problem with the lash adjusters, the noise
1. Start the engine.
2. Check that the noise occurs immediately after the engine
is started, and that the noise changes in accordance
with changes in the engine speed.
If the noise does not occur immediately after the engine
is started, or if it does not change in accordance with
the engine speed, the problem is not being caused by
the lash adjusters, so check for some other cause of
the problem. Moreover, if the noise does not change in
accordance with the engine speed, the cause of the
problem is probably not with the engine. (In these cases,
the lash adjusters are normal.)
On-vehicle Service
the cause is a burnt or defective valve seat, or pressure
is leaking from the gasket.
with the lash adjusters is generated after the engine
is started, and will vary according to the engine speed.
However, this noise is not related to the actual engine
load.
Because of this, if the noise does not occur
immediately after the engine is started, if it does not
change in accordance with the engine speed, or if
it changes in accordance with the engine load, the
source of the noise is not the lash adjusters.
will almost never disappear, even if the engine has
been run at idle to let it warm up.
The only case where the noise might disappear is
if the oil in the engine has not been looked after
properly and oil sludge has caused the lash adjusters
to stick.