Results Of Incorrect Operation; Crankcase Ventilation (Cv) System Inspection; Drive Belt Chirping, Squeal, And Whine Diagnosis - Suzuki XL7 2007 Service Manual

6. Apply shop air pressure to the J 35667-A and adjust
according to the manufacturers instructions.
7. Record the cylinder leakage value. Cylinder leakage
that exceeds 25 percent is considered excessive
and may require component service. In excessive
leakage situations, inspect for the following
conditions:
– Air leakage sounds at the throttle body or air inlet
hose that may indicate a worn or burnt intake
valve or a broken valve spring
– Air leakage sounds at the exhaust system tailpipe
that may indicate a worn or burnt exhaust valve or
a broken valve spring
– Air leakage sounds from the crankcase, oil level
indicator tube, or oil fill tube that may indicate
worn piston rings, a damaged piston, a worn or
scored cylinder bore, a damaged engine block or
a damaged cylinder head
– Air bubbles in the cooling system may indicate a
damaged cylinder head or a damaged cylinder
head gasket.
8. Perform the leakage test on the remaining cylinders
and record the values.
Crankcase Ventilation System Inspection/
Diagnosis

Crankcase Ventilation (CV) System Inspection

• Test for vacuum at the vacuum hose where it
connects to the crankcase ventilation valve or the
cylinder head cover. There should be manifold
vacuum present at the hose. If there is no vacuum,
inspect for a plugged hose, leaking hose or a plugged
vent adapter.
• Plug the end of the vacuum hose while the engine is
running. Inspect the hose for any areas that collapse
when the end of the hose is blocked. Replace the
hose if it collapses when blocked.
• If oil has accumulated in the intake air duct, inspect for
the following conditions:
– Plugged vacuum orifice in the crankcase ventilation
housing
– Plugged or restricted crankcase ventilation housing
– Excessive crankcase pressure or blow-by, refer to
"Oil Consumption Diagnosis: ".
• Additional items to inspect:
– Plugged or leaking fresh air vent hose assembly or
vent adapter
– Plugged or restricted passages in the throttle body
– Missing or damaged O-ring seals on the vent
adapter
– Inspect the cam covers, the oil pan gasket, and
other sealing areas for leaks

Results of Incorrect Operation

A plugged crankcase ventilation housing or hose may
contribute to the following conditions:
• A rough idle
• Stalling or a slow idle speed
• Oil leaks
• Oil accumulation in the intake air duct
• Sludge in the engine
A leaking housing or hose may contribute to the
following conditions:
• A rough idle
• Stalling
• Unstable idle speed
Drive Belt Chirping, Squeal, and Whine
Diagnosis
Diagnostic Aids
• A chirping or squeal noise may be intermittent due to
moisture on the drive belts or the pulleys. It may be
necessary to spray a small amount of water on the
drive belts in order to duplicate the customers
concern. If spraying water on the drive belt duplicates
the symptom, cleaning the belt pulleys may be the
probable solution.
• If the noise is intermittent, verify the accessory drive
components by varying their loads making sure they
are operated to their maximum capacity. An
overcharged A/C system, power steering system with
a pinched hose or wrong fluid, or a generator failing
are suggested items to inspect.
• A chirping, squeal or whine noise may be caused by a
loose or improper installation of a body or suspension
component. Other items of the vehicle may also
cause the noise.
• The drive belts will not cause a whine noise.
Test Description
The numbers below refer to the step numbers on the
diagnostic table.
2.
The noise may not be engine related. This step is to
verify that the engine is making the noise. If the engine is
not making the noise do not proceed further with this
table.
3.
The noise may be an internal engine noise. Removing
the drive belts one at a time and operating the engine for
a brief period will verify the noise is related to the drive
belt. When removing the drive belt the water pump may
not be operating and the engine may overheat. Also
DTCs may set when the engine is operating with the
drive belts removed.
4.
Inspect all drive belt pulleys for pilling. Pilling is the small
balls or pills or it can be strings in the drive belt grooves
from the accumulation of rubber dust.
Engine Mechanical: 1D-35