Exhaust System Components Inspection (On Vehicle); Exhaust System (For 2.3L. 3.Ol. 4.Ol - Mazda B-Series 1997 Workshop Manual

FT
FUEL SYSTEM (FOR 2 . 3 ~ 1 3 . 0 ~ 1 4 . 0 ~ )
Note
Perform the following installation carefully to pre-
vent fuel leakage from the O-ring.
6. Install the injector.
7. Turn the ignition switch ON and check for leaks from
injector.
8. If not as specified, replace the injector.
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EXHAUST SYSTEM (FOR 2.3L / 3.OL / 4.OL)
COMPONENTS
Inspection (On-vehicle)
1. Start the engine and verify that there is no exhaust gas
leakage from the exhaust system components.
2.
If an exhaust leak is found, replace parts as necessary.
3. Connect a vacuum gauge to the intake manifold vacuum
source.
4. Connect a tachometer to the engine.
5.
Start the engine and place the transmission into neutral.
6. Gradually increase the engine speed to 2000 rpm while
observing the vacuum gauge.
7.
Decrease the engine speed to idle while observing the
vacuum gauge.
Note
The vacuum gauge reading may be normal when
the engine is first started and idled. However,
excessive restriction in the exhaust system will
cause the vacuum gauge to drop to
a
low point
even while the engine is idled.
8. The manifold vacuum should exceed 53 kPa
(406 mmHg, 16 inHg).
9. If the manifold vacuum exceeds specified vacuum, then
the exhaust system is OK.
10. If the manifold vacuum does not exceed specified
vacuum or the vacuum is slow to return to normal, then
inspect the following components for restrictions:
Silencer
Three-way catalytic converter
Exhaust manifold(s)
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