Chevrolet Impala 1969 Owner's Manual page 81

*controlled
combustion
system (ccs)
NEW CARBURETOR
LEAN MIXTURES,
ENGINE IDLE
INCREASED
KEY TO
c.c.s.
SYSTEM
. . . . 1ltAl(IIU I!O(I!HOOO .....
q
U "OE l HODD All
~
HOT(XIIJ.UST
•
-
I
SPARK
TIMING
C1WIGED
CONTROLLED
INTAKE AIR
HEAT EXCHANGEIl
FROM EXHAUST
MANifOLD TO
UNDERHOOD
AIR FLOW
OPERATION: The Controlled Combustion System is
entirely separate from the Positive Crankcase Ventilation
system and is designed to reduce exhaust air pollution by
altering the combustion process . CCS includes a special
air cleaner which incorporates thermostatic control of
heated air to the carburetor, a special calibrated carbu·
retor and distributor and related components .
MAINTENANCE: Complete effectiveness of the system,
as well as full power and performance, depend upon
engine idle speed, ignition timing, and idle fuel mixture
being set according to the specifications shown on a decal
under the hood. These adjustments should be checked
at the first oi l change (4 months or 6,000 miles, whichever
comes first). Subsequent checks shou ld be made at 12
month or 12,000 mile intervals, whichever comes first.
These adjustments are also included as part of the quality
tune-up recommended at the same intervals.
* System illustrated on V-S engine, 6-cylinder system similar.
DO YOUR SHARE FOR CLEANER AIR-FOLLOW PERIODIC SERVICE RECOMMENDATIONS
(See previous three pages)
• All items affecting vehicle emission can·
trois should be checke d at the first oi l change
(4 months or 6,000 miles, whi chever comes
first).
• A subsequent check should be made
at 12 months or 12 ,000 miles , whichever
comes first,
and e very
12
months
or
12,000
miles Iherea/tar .t
t
A check of those ilems vilal 10 your veh icle's emis-
sion control system is included in th e re commended
quality Engine Tun e-Ups at the same spec ified inter-
va ls.