Pontiac Fiero 1988 Service Manual page 273

6-2 ENGINE GENERAL INFORMATION
GENERAL IN
CLEANLINESS A N D CARE
An automobile engine Is a combination of many
machined, honed, polished and lapped surfaces with
tolerances that are measured in the ten-thousandths of
an inch. When any internal engine parts are serviced,
care and cleanliness are important. A liberal coating of
engine oil should be applied to friction areas during
assembly, to protect and lubricate the surfaces on
initial operation. Throughout this section, it should be
understood that proper cleaning and protection of
machined surfaces and friction areas is part of the
repair procedure. This is considered standard shop
practice, even if not specifically stated.
Whenever valve train components are removed
for service, they should be kept in order. They should
be installed in the same locations, and with the same
mating surfaces, as when removed
Battery cables should be disconnected before any
major work is performed on the engine. Failure to
disconnect cables may result in damage to wire harness
or other electrical parts.
ENGINE S E R V I C E
THE FOLLOWING INFORMATION ON
ENGINE SERVICE SHOULD BE NOTED
CAREFULLY, AS IT IS IMPORTANT IN
ENGINE PERFORI
INTRODUCTION
Engine Performance Diagnosis procedures are
guides that will lead to the most probable causes of
engine performance complaints. They cover the
components of the fuel, ignition, and mechanical
systems that could cause a particular complaint, and
then outline repairs in a logical sequence.
It is important to determine if the
" S e r v i c e
Engine Soon"
light is
" O N / #
or has come "ON" for
a short interval while driving. If the
" S e r v i c e E n g i n e
S o o n "
light has come
" O N / '
the Computer
Command Control System or DECS should be
checked for stored
" T r o u b l e C o d e s "
(See Diagnostic
Circuit Check, Section 6E, for the engine you are
working on) which may indicate the cause for the
performance complaint.Each Symptom is defined, and
it is important that the correct one be selected, based
on the complaints reported or found. The definition of
each symptom is included with the symptom.
The words used may not be what you are used to
in all cases, but because these terms have been used
SECTION 6 F - EXHAUST S Y S T E M
This section has information on all exhaust
system parts, such as tailpipes, mufflers, and the
catalytic converter.
ORMATION
PREVENTING DAMAGE AND IN
CONTRIBUTING TO RELIABLE ENGINE
PERFORMANCE.
When raising or supporting the engine for any
reason, do not use a jack under the oil pan. Due to the
small clearance between the oil pan and the oil pump
screen, jacking against the oil pan may cause it to be
bent against the pump screen resulting in a damaged
oil pick-up unit.
When working on the engine, remember that the
12-volt electrical system is capable of causing short
circuits. When performing any work where electrical
terminals could possibly be grounded, the ground cable
of the battery should be disconnected at the battery.
Any time the carburetor or air cleaner is
removed, the intake opening should be covered. This
will protect against accidental entrance of foreign
material, which could follow the intake passage into
the cylinder and cause extensive damage when the
engine is started.
IN THE MECHANICAL PROCEDURES
DESCRIBED IN THIS SECTION, GENERALLY
NO REFERENCES WILL BE MADE TO THE
REMOVAL OF OPTIONAL EQUIPMENT SUCH
AS POWER STEERING PUMP, AIR
CONDITIONING COMPRESSOR, ETC.
SHOULD IT BECOME NECESSARY TO
REMOVE ANY SUCH ITEM TO PERFORM
OTHER SERVICE, REFER TO THE
APPROPRIATE SECTION OF THIS SERVICE
MANUAL FOR SPECIFIC INFORMATION.
ANCE DIAGNOSIS
interchangeably for so long, it was necessary to decide
on the most common usage and then define them. If the
definition is not understood, and the exact Symptom is
not used, the Diagnostic procedure will not work.
It is important to keep two facts in mind:
1. The procedures are written to diagnose problems
on cars that have
" r u n w e l l a t o n e t i m e "
and
that time and wear have created the condition.
2. All possible causes cannot be covered,
particularly with regard to emission controls. If
doing the work prescribed does not correct the
complaint, then either the wrong Symptom was
used, or a more detailed analysis will have to be
made.
All of the Symptoms can be caused by worn out
or defective parts such as Spark Plugs, Ignition
Wiring, etc. If time and/or mileage indicate that
parts should be replaced, it is recommended that
it be done.
Refer to:
® Section 6E - Driveahilitv
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