Mazda 626 MX-6 Workshop Manual page 18

1
TUNE-UP PROCEDURE
1—8
.. . . . ....__........................ :
2. If the noise does not stop, check for movement of
each HLA by pushing down each rocker arm by
hand while at TDC of compression stroke.
3. If the rocker arm moves down, replace the HLA.
(Refer to page 1—69.)
86U01X-016
Ignition Timing
1. Warm up the engine and run it at idle.
2. Turn all electric loads OFF.
3. Ground the test connector to the vehicle with a jum­
per wire. (Turbo)
4. Connect a timing light tester.
5. Disconnect the vacuum hose from the vacuum
control, and plug the hose. (Non-turbo)
6. Check that the ignition timing mark (yellow) on the
crankshaft pulley and the timing mark on the tim­
ing belt cover are aligned.
Ignition timing
Turbo
Non-Turbo: 6° ± 1° BTDC
7. If necessary, adjust the ignition timing by turning
the distributor.
86U01X-210
Idle Speed
1. Ground the test connector to the vehicle with a jum­
per wire.
2. Connect a tachometer to the engine.
3. Check the idle speed.
Idle speed (MTX in neutral, ATX " P" range)
750 ± 25 rpm
4. If necessary, remove the blind cap from the throt­
tle body and adjust by turning the air-adjust screw.
5. Install the blind cap and disconnect the jumper wire
from the test connector.
626, MX-6 Revised 10/87
.: J— -
: 9° ± 1 ° BTDC