(7) If pressure exceeds maximum limits, inspect
exhaust system for restricted component. For further
catalytic converter inspection procedures, (Refer to 11
- EXHAUST SYSTEM/CATALYTIC CONVERTER -
INSPECTION). Replace component(s) as necessary.
EXHAUST BACK PRESSURE LIMITS
Exhaust Back Pressure Limit (Max)
Vehicle in Park/Neutral
(no load) @2000 RPM
3.45 Kpa (0.5 psi)
INSPECTION
EXHAUST SYSTEM INSPECTION
Inspect the exhaust pipes, catalytic converters, and
resonators for cracked joints, broken welds and cor-
rosion damage that would result in a leaking exhaust
system. Inspect the clamps, support brackets, and
isolators for cracks and corrosion damage.
NOTE: Slip joint band clamps are spot welded to
exhaust system. If a band clamp must be replaced,
the spot weld must be ground off.
ADJUSTMENTS
EXHAUST SYSTEM ALIGNMENT
A misaligned exhaust system is usually indicated
by a vibration, rattling noise, or binding of exhaust
system components. These noises are sometimes hard
to distinguish from other chassis noises. Inspect
exhaust system for broken or loose clamps, heat
shields, isolators, and brackets. Replace or tighten as
necessary. It is important that exhaust system clear-
ances and alignment be maintained.
Perform the following procedures to align the
exhaust system:
(1) Loosen clamps and support brackets.
(2) Align the exhaust system starting at the front,
working rearward.
(3) Tighten all clamps and brackets once align-
ment and clearances are achieved.
Fig. 2 VACUUM DIAGRAM
(
ACTIVATED
(
ZB EXHAUST SYSTEM 11 - 3
EXHAUST SYSTEM (Continued)
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