Air Injection Reactor System (A .L.r; E Vaporation Control System (E.c.s; Early Fuel Evaporation (E.f.e.) System; Air C Leaner - Chevrolet 1977 light duty truck Service Manual

be tested for pro per function and serviced, if necessary
(Also see m aintenance schedule at end o f this section.)
Air Injection Reactor System
(A .I.R .)--C ontrolled Combustion
System (E.C.S.)
The Air Injection Reactor system should have the
drive belt inspected for w ear and tension every 24
m onths or 30,000 miles (4 m onths or 6,000 miles Heavy
Duty Emission Vehicles), whichever occurs first. In
addition, complete effectiveness o f either system, as well
as full power an d perform ance, depends upon idle speed,
ignition timing, and idle
according to specification. A quality
includes these adjustm en ts
periodically to assure norm al engine efficiency, operation
and perform ance.
Evaporation Control S ystem (E.C.S.)
Every 30,000 miles
Emission Vehicles) or 24 months, (more often under
dusty conditions) the filter in the base o f the canister
must be replaced and the canister inspected.

Early Fuel Evaporation (E.F.E.) System

First 7,500 miles or 12 months check valve for
freedom o f operation. A binding condition must be
corrected. Check hoses
deterioration. Replace parts as necessary.

Air C leaner

Do not remove the engine air
CAUTION:
cleaner unless temporary removal is necessary
during repair or maintenance o f the vehicle.
When the air cleaner is removed backfiring can
cause fire in the engine compartment.
N O T E: U n d e r prolonged dusty driving conditions,
it is recom m ended
perfo rm e d more often.
Replace the engine
norm al operatin g conditions every 30,000 miles (12,000
miles Heavy Duty Emission Vehicles except C alifornia
350-400 engines, replace every 24,000 miles).

Fuel Filter

L ig h t D u ty Em ission V eh icles-R ep lace
located in c arburetor inlet every 12 months or 15,000
miles whichever occurs first, or, if an in-line filter is also
used, replace both filters every 30,000 miles.
Heavy Duty
Em ission
ment in carburetor inlet every 12 months or 12,000 miles,
w hichever comes first, except C alifornia 350-400 engines
should be replaced every 24 months or 24,000 miles.
A c c ele rato r Linkage
Lubricate with engine oil every 15,000 miles (12,000
miles Heavy D uty Emission Vehicles) as follows:
fuel mixture being
tune-up which
should be p e rfo rm e d
(24,000 miles Heavy Duty
for cracking, abrasion
that these operations
air cleaner element under
filter element
filter ele­
Vehicles-R ep lace
1. On V8 engine, lubricate the ball stud at the
carburetor lever.
2. On L6 engine, lubricate the two ball studs at the
carburetor lever and lubricate the lever m ounting stud.
Do not lubricate the accelerator cable.
A U T O M A T IC T R A N S M IS S IO N
Fluid Recom m endations
Use automatic transmission fluids identified with the
mark D E X R O N ® II.
Check the fluid level at each engine oil change
period.
Automatic transmissions are frequently overfilled
set
because the fluid level is checked when the fluid is cold
and the dipstick
However, the low reading is norm al since the level will
rise as the fluid tem perature increases. A level change o f
over 3 /4 inch will occur as fluid tem perature rises from
60 F to 180°F.
Overfilling can cause foam ing and loss o f fluid
through the vent. Slippage and transmission failure can
result.
Fluid level too low can cause slipping, particularly,
when the transmission is cold or the vehicle is on a hill.
Check the transmission fluid level with engine
running, the shift lever in PARK and the vehicle level.
NOTE: If the vehicle has recently been operated
or
for an extended period at high speed o r in city
traffic in hot w eather or the vehicle is being used to
pull a trailer, an accurate fluid level cannot be
determ ined until the fluid has cooled down -
usually about 30 minutes after the vehicle has been
parked.
Remove the dipstick and touch the transmission end
o f the dipstick cautiously to find out if the fluid is cool,
w arm or hot.
W ipe it clean and re-insert until cap seats. Remove
dipstick and note readings.
be
• If the fluid feels cool, about room temperature
65 °F to 8 5 °F the level should be 1/8 to 3 /8 inch below
the ADD mark. The dipstick has two dimples below the
"A D D ' mark to show this range (fig. 0B-1).
• If it feels warm , the level should be close to the
ADD m ark (either above or below).
i - r ^ A D D 1
\ ____
NOTE: DO NOT OVERFILL. It takes only one pint to raise
level from ADD to FULL with a hot transmission.
indicates fluid should be
( 6 5 85 F .) ( 1 8 ? 9 C . )
C O O L H O T
H O T
I
__ S ______________
W A R M
added.
'