l-36 Chapter 1 Tune-up and routine maintenance
2.4L Engine
44.1 Tools needed to check and adjust the ignition timing
1 Vacuum plugs
- Vacuum hoses will, in most cases, have
to be disconnected and plugged. Molded plugs in various
shapes and sizes are available for this.
2 Inductive pick-up timing
light - Flashes a bright
’ concentrated beam of light when the number one spark
plug fires. Connect the leads according to the instructions
supplied wiih the light.
3 Distributor wrench
- On some models, the hold-down
bolt
for the distributor is difficult to reach and turn with
conventional wrenches or sockets. A special wrench like
this must be used.
1 The proper ignition timing setting for your vehicle is printed on the
VECI label located in the engine compartment. Some special tools will be
required for this procedure
(see illustration).
2 Locate the timing plate on the front of the engine, near the crankshaft
pulley. The T or 0 mark is Top Dead Center (TDC). To locate which mark
the notch in the pulley must line up with for-the timing to be correct, count
backfrom the TorO markthe number of degrees BTDC (Before Top Dead
Center) noted on the VECI label.
3 Locate the timing notch in the pulley and mark it with a dab of paint or
chalk so it’ll be visible under the strobe light. To locate the notch it may be
necessary to have an assistant temporarily turn the ignition key to Start in
short bursts to turn the crankshaft.
Warning:
Stay c/ear ofall moving en-
gine components if the engine is turned in this manner!
4 Connect a tachometer according to the manufacturer’s instructions
and make sure the idle speed is correct (carbureted models). Adjust it, if
necessary, as described in Chapter 4.
5 Allow the engine to reach normal operating temperature. Be sure the
air conditioner, if equipped, and all other accessories are off.
6 With the ignition switch off, connect the pick-up lead of the timing light
to the number one spark plug wire. On four-cylinder engines, it’s the front
one. On V6 engines its the first spark plug on the right side asviewed from
the driver’s seat. Use either ajumper lead between the wire and plug or an
I inductive-type pick up. Don’t pierce the wire or attempt to insert a wire be-
tween the boot and plug wire. Connect the timing light power leads accord-
ing to the manufacturer’s instructions. On fuel-injected models, should it
be necessary to connect a tachometer (to verify the idle speed is correct),
insert a paper clip into the wire side of the fuel injector connector -without
disconnecting it
- (see illustrations).
Connect the tachometer between
the paper clip and ground.
44.6a To connect a tachometer on fuel-injected models, locate
the fuel injector connector (arrows). . .
Female connector
Male connector
44.6b. . . and insert a paper clip as shown into the connector -
the tachometer Is then connected between the paper clip
and ground
44.7 On fuel-injected models, connect a jumper wire between
the ignition timing adjusting connector and ground (Montero
model shown)
7 On fuel-injected models, remove the waterproof cover from the igni-
tion timing adjusting connector (in the engine compartment) and connect a
wire with alligator clips between the terminal in the connector and ground
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