fuel pump CHEVROLET MONTE CARLO 1981 4.G Owners Manual

Downloaded from www.Manualslib.com manuals search engine FUEL REQUIREMENTS
Your engine is designed to use only unleaded gasoline . Unleaded gasoline must be uSed for the emission control system to operate properly . Its use will
also reduce spark
plug fouling, exhaust .system corrosion and engine oil deterioration.
Using
leaded gaso~ne can damage the emission control system and could
result
in loss of warranty coverage. The effectiveness of the catalyst in the
catalytic converter decreases after use of as little as one tank of leaded
gasoline.
Also, your vehicle may have the "Computer Command Control" system, which includes an oxygen sensor. Leaded gasoline will damage the
sensor,
and attect emissioncont(ols. (For more information, see "Computer
Command Control
System" in "Service and Maintenance,"Section 5 of this manual. Federal regulations require that pumps delivering unleaded-gasoline
be labeled with the word UNLEADED. Only these pumps have nozzles whichftl the filler neck of your vehicle's gasoline tank.
In the United States, Federal law also requires that gasoline octane ratings be
posted on the pumps. The octane rating shown is an average of Research
octane (R) and Moto< octane (M). In most parts of the United States , you
should use unleaded gasoline with an octane rating of at least 87. However,
you may use unleaded gasoline with an Q!;tane rating as low as 85 in these
. high -altitude areas: Coloraclo , Montana, New Mexico , Utah , Wyoming,
northeastern Nevada, southern Idaho, western South Dakota, and that part of
Texas which is directly south of New Mexico .
Using unleaded gasoline with
an octane rating lower than stated above can
cause persistent, heavy
"spark knock." (" Spark knock" is a metallic rapping
noise.) " severe, this can
lead to engine darnage. " you detect heavy spark knock even ",hery using gasoline of the stated octane rating, 0<. if you hear steady spark knoo~ 'wfiil.)' Holding a' steady speed on level roads, have your
dealer correct the
problem . Failure to take steps to stop such knocking is
misuse
of the vehicle, for which Chevrolet is not responsible . However, now and then you may notice light spark knock for a short time while accelerating
or driving
up hills : This is no cause fo< concern, because you get the greatest
fuel economy
benem from the gasoline's octane rating when there is
occasional light spark knock. Using .gasoline with a higher .octane rating than
that which
allows occasional spark knock is an unnecessary expense.
Gasohol
Gasohol, a mixture of unleaded gasoline and ethanol (grain alcohol), is
available in some areas , You may use gasohol in yourvehicle ,provided it is no
more than 10% ethanoL Be sure the gasohol has octane ratings no lower than
those stated above for unleaded
gasoline . Some vehicles using gasohol could run leaner . Most drivers will not notice a difference, but some may. In such
cases your authorized dealer can make c.ertain adjustments, provided they are
not in violation of the Federal
Clean Air Act. " you. are still not satisfied with gaSOhol performance , you may prefer to uSe unleaded gasoline. •
NOTICE: ,Take care to not spiH gasohol on painted surfaces. Gasohol can cause paint damage, which may not be covered und~r the new vehicle warranty.
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Downloaded from www.Manualslib.com manuals search engine DISC BRAKE WEAR INDICATORS
Front disc brakes have bum-in we .ar indicators which are desigled to make a
high-pitched squeating or
cricket·tike warning sound when the brake pads are
worn to where new pads are needed . The sound will come
and go. or be heard
all the time when the wheels are rolling, but will stop when the brake pedal is
pushed down
firmly. Expensive damage can result if pads are not replaced When needed .
See also the brake checks listed in the Maintenance Schedule folder.
INSTRUMENT PANEL AND CONTROLS
INSTRUMENTS
The instruments . gages and indicator lights convenienlly grouped in the
instrument cluster are designed to tell you at a glance many important things
about the perform ance of your
vehicle. The following information will enabl e
you to more quickly understand and properly interpret these instruments.
Speedometer
The speedometer hand indicates vehicle speed in miles per hour and
kilometers per hour.
Odometer
The group of six figures in the, speedometer lower center sectiori indicates the
accumulated mileage.
Trip Odometer (optional)
The trip odometer may be reset to zero by turning stem to. the right This
instrument may be used to 1TI<\':!1 .. aPC~rately record trip mileages 'or kilometers .
Fuel Gage
The fuel gage will register the APPROXIMATE fuel level in the tank. when the
ignition is in the
RUN position .
When the
gage registers EMPTY. some fuel is still available as a reserve .
When the gage registers FULL. some
additional fuel can still be added to the
tank. The following conditions maybe considered normal:
•
Gas station pump may shut off before fuel gage indicates FULL
• Amount of gasoline reqUired ior fill~up may not exaclly correspond to gage.
• Needle
may not move awa y from FULL until some time aiter fill·up .
• Needle
may move during turns. stops and accelerations.
When the ignition switch is turned to the OFF position, the needle will not
necessarily return all the way·to the EMPTY mark.
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Downloaded from www.Manualslib.com manuals search engine OPERATION OF THE TURBOCHARGED
3.8L
V-6 (CODE 3) ENGINE
Turbocharging Gives You Extra Power ...
A turbocharger is ci device that supplies a conventional internal· combustio n
engin e with
extra power on demand . Basically . it's a pump powered by exhaust
~es.
··'···"'wha F tulbl>charging .does is to recover some of that exhaust gas energy to
increase engine power output. The turbocharger consists of
an eXhaust-gas ­
driven turbine which is coupled to a compressor in the intake system . As
engine speed and load increase, exhaust gases spin the turbine, which in turn
dri v
es the compre ssor and forces a denser ail/fuel mixture charge into the combustion chambers. This denser charge, when ignited in the conventional
manner, delivers more power per stroke of the piston than
the non­
turbocharged engine.
Since the turbocharger is powered
by exhaust gases that normally go out the
tailpipe ,
in effect it recycles energy that would otherwise be wasted .
When we say it works "on demand ." we mean exactly that. When the
turbocharged
V-6 is driven under normal OQnditions, a normal air Ifuel mixture
reaches the cylinders . But , in a situation requiring extra power in passing, for
instance -pressing down on the
accelerator .speeds up the turbo, and the 3.8
liter V-6 engine increases its power output. When you litt your foot, the
turbocharger slows down again.
Turbocharging has long
been recognized as an answer to high-altitude
operation. Anon-turbocharged engine can
Jose as much as 25% of its poWer
at 8,000 feet. Turbocharging compensates for altitude changes, letting the
engine breathe "
sea level" air at high ; "thin air," anitudes . It restores
otherwise lost power, reduces . gearshitting
and the n9E)d for heavy pressure on the accelerator .
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