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INTRODUCTION — General Precautions
WRONG
CORRECT
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Know the importance of periodic maintenance.
(a)
Every service item in the periodic maintenance list
must be performed.
Listen to the customers comments carefully.
Always determine exactly what the customer complaint is,
if any, and verify it before proceeding with repairs.
Determine
if you
have an engine or emission system pro-
blem.
{a)
Engine problems are usually not caused by the emis-
sion control systems,
(b)
When troubleshooting, always check the engine and
the ignition system first.
Check hose and wiring connections first.
The most frequent cause of problems is simply a bad con-
nection in wiring or vacuum
hoses, Always make sure that
connections are secure and correct.
Observe the following precautions to avoid damage to the
parts:
(a)
To disconnect vacuum hoses, pull on the end, not the
middle of the hose,
(b}
To pull apart electrical connectors, pull on the con-
nector itself, not the wires.
(c)
Be careful not to drop electrical components, such as
sensors or relays. If they are dropped on a hard floor,
they should be replaced and not reused.
(d)
When
steam cleaning an engine, protect the distri-
butor, coil, air filter, carburetor intake, air pump and
VCV from water.
(e)
Never
use an
impact wrench
to remove
or install
thermo switches or thermo sensors.
(f)
When
checking
continuity
at the
wire
connector,
insert the tester probe carefully to prevent terminals
from bending.
(g)
When
using a vacuum
gauge,
never
force the hose
onto a connector that is too large. Use a step-down
adapter instead. Once the hose has been stretched, it
may leak,
INTRODUCTION —
Example
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General Precautions, Precautions for
Vehicles Equipped with a Catalytic Converter
1-3
Tag hoses before disconnecting them:
(a)
When disconnecting vacuum
hoses, use tags to identi-
fy how they should be reconnected.
(b)
After completing a job, double check that the vac-
uum hoses are properly connected. A label under the
hood shows the proper layout.
PRECAUTIONS FOR VEHICLES EQUIPPED WITH A
CATALYTIC CONVERTER
WARNING:
\f large amounts of unburned gasoline flow into
the catalytic converter, it may overheat and create a fire hazard.
To prevent this, observe the following precautions and explain
them to your customer.
1
2s
Use only unleaded gasoline.
Avoid prolonged idling.
Avoid running the engine at fast idle speed for more than
10 minutes and an idle speed for more than 20 minutes.
Avoid spark jump test.
(a)
Spark jump only when absolutely necessary. Perform
this test as rapidly as possible.
(b)
While testing, never race the engine.
Avoid prolonged engine compression measurement.
Engine
compression
tests
must
be made
as
rapidly
as
possible.
Do not run engine when fuel tank is nearly empty.
This may cause the engine to misfire and create an extra
load on the catalytic converter.
Avoid
coasting
with ignition turned off and prolonged
braking.
Do not dispose of used catalytic converter near parts con-
taminated with gasoline or oil.
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