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7. TRANSMISSION SERVICE;- 
Automatic  Transmission 
- Change the transmission  fluid  and  filter 
every  15,000  miles 
(25 000 km) for vehicles under  8,600 GVWR or 
every  12,000  miles 
(20 000 km) for vehicles  over 8,600 GVWR if the 
vehicle 
is mainly  driven  under one or more of these conditions: 
In  heavy  city  traffic. 
0 Where  the outside temperature  regularly reaches 90°F (32°C) or 
higher. 
In  hilly  or mountainous  terrain. 
Frequent trailer  pulling. 
0 Uses such as taxi, police,  delivery  or other commercial service. 
If  the  vehicle  is  not  used  mainly  under  any 
of these conditions, change 
the  fluid and filter  every 
30,000 miles (50 000 km) for vehicles  under 
8,600 GVWR  or every 24,000 miles (40 000 km)  for vehicles  over 
8,600 GVWR see “Automatic  Transmission  Fluid” in the  Index  for 
more information. 
Manual  Transmission - Transmission  fluid  does not  require  periodic 
changing. 
8. CDRV SYSTEM INSPECTION* - Check the Crankcase 
Depression Regulator  Valve System  for 
any worn,  plugged  or collapsed 
hoses. Have  the  system  checked as described in the Service Manual. 
9. FUEL  FILTER  REPLACEMENT*$ - Replace  the  fuel  filter at  the 
specified  interval or sooner  if clogged. 
10. SPARK  PLUG  REPLACEMENT* - Replace  spark  plugs  with  the 
type  listed  in  Section 
6. See “Specification  Charts” in the  Index. 
1 1. SPARK  PLUG  WIRE  INSPECTION - Clean wires  and  inspect for 
burns, cracks or other  damage. Check  the  wire  boot fit at  the  distributor 
and  at  the 
spark plugs.  Replace  wires as needed. 
‘% An Emission  Control Service 
$The  California Air Resources  Board  has  determined  that  the  failure  to 
perform  this maintenance item  will 
not nullify the emission warranty or 
limit recall  liability  prior to the completion of the  vehicle  useful  life. 
General Motors,  however,  urges  that  all  recommended  maintenance 
services  be  performed  at  the indicated  intervals  and  the  maintenance  be 
recorded. 
?A  fluid loss  in 
these systems may indicate a  problem.  Have  them 
inspected  and  repaired  at  once. 
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12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
EGR  SYSTEM  INSPECTION* - Conduct EGR SYSTEM CHECK 
as described in the  Service  Manual. 
ELECTRONIC  VACUUM  REGULATOR  VALVE  (EVRV) 
INSPECTION* 
- Inspect  filter for excessive  contamination or 
plugging.  If required,  clean  element  with  a solution  of  biodegradable 
soap  and  water,  let  dry  and  reinstall  element. 
ENGINE  TIMING  CHECK  AND  DISTRIBUTOR  CHECK  (SOME 
MODELS)*$ 
- Adjust  timing to underhood  label  specifications. 
Inspect 
the inside  and  outside  of  the  distributor  cap  and  rotor  for cracks, 
carbon  tracking  and  corrosion.  Clean 
or replace as needed, 
FUEL  TANK,  CAP  AND  LINES  INSPECTION*$ - Inspect  the 
fuel tank,  cap and  lines for  damage  or  leaks.  Remove  fuel  cap, inspect 
gasket  for an  even  filler neck  imprint,  and  any  damage.  Replace  parts 
as needed. 
THERMOSTATICALLY  CONTROLLED  AIR  CLEANER 
INSPECTION*A 
- (If so equipped.)  Inspect  all  hoses  and  ducts for 
proper  hook-up. 
Be sure the  valve  works  properly. 
SINGLE  ENGINE  ACCESSORY  DRIVE  (SERPENTINE)  BELT 
INSPECTION* 
- Inspect  belt.  Look  for cracks,  fraying,  wear,  and 
proper  tension.  Adjust  or replace 
as needed. 
Check  all 
fuel and  vapor  lines  and  hoses  for proper  hookup,  routing, 
and  condition.  Check  that  the  purge  valve  works  properly, 
if equipped. 
Replace  as  needed. 
SHIELDS  AND  UNDERHOOD  INSULATION  INSPECTIONAV 
- Inspect  shields  and  underhood  insulation for damage  or looseness. 
Adjust  or replace 
as required. 
AIR  INTAKE  SYSTEM  INSPECTIONAV - Check the air intake 
system  installation  to see  that  gaskets  are sealed  properly  and  all  hose 
connections,  fasteners,  and  other components  are tight.  Also  check  to 
be  sure  that 
the air cleaner  housing is properly  seated,  that the cover  fits 
tightly,  and  the  wing  nuts  are tight.  Tighten  connections  and  fasteners 
or  replace  damaged  parts 
as required. 
'% An Emission  Control  Service 
ANoise  Emission  Control  Service 
P'Applicable  only  to vehicles  sold 
in the  United  States 
$The  California  Air  Resources  Board 
has determined  that  the  failure  to 
perform  this  maintenance  item  will  not  nullify 
the emission  warranty  or 
limit  recall  liability  prior  to  the  completion  of  the  vehicle  \
useful  life. 
General  Motors,  however,  urges  that 
all recommended  maintenance 
services  be  performed  at  the  indicated  intervals  and  the  maintenance  be \
recorded. 
EVAPORATIVE  CONTROL  SYSTEM  (ECS)  INSPECTION* - 
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Lap  and  Shoulder  Belts  Condition  and  Operation - Inspect  belt system, 
including  webbing,  buckles,  latch  plates,  retractors,  guide  loops\
  and 
anchors. Have 
a belt  assembly  replaced if the webbing  has  been  cut  or 
otherwise damaged. 
Body Lubrication  Service - Lubricate  all  body  door hinges  with  engine 
oil. 
Also lubricate the tailgate,  tailgate  handle  pivot  points,  and  tailgate 
mounted  spare tire  carrier  (if  equipped). Lubricate  the  body  hood, 
fuel door 
and  rear  compartment  hinges, latches and  locks  including  interior  glove box 
and  console doors,  and  any folding seat  hardware.  Lubricate  the  hood  safety 
lever  pivot  and  prop rod  pivot.  More  frequent  lubrication  may  be  required 
when  exposed  to 
a corrosive  environment. 
Periodic  Maintenance  Inspections - Listed  below  are inspections  and 
services  which  should  be  performed  at  least  twice 
a year (for instance  each 
spring  or fall).  You should  let  your 
GM dealer’s  service  department  or other 
qualified  service center  do 
these jobs. Make sure  any  necessary  repairs  are 
completed  at once. 
Steering  and  Suspension  Inspection? - Inspect  front  and  rear suspension 
and  steering  system  for  damaged, loose or missing  parts,  signs 
of wear  or 
lack  of  lubrication.  Inspect  power  steering  lines  and  hoses  for proper 
hook-up,  binding,  leaks,  cracks,  chafing, etc. Lubricate the  steering  linkage. 
Accelerator  Control  System - On gasoline  engines,  lubricate the pivot  at 
the 
TBI throttle  lever  stud  with  engine oil. Do not oil any  accelerator  or 
cruise  control  cables. Replace  any  cables that  have  high  effort  or excessive 
wear. 
Exhaust  System  Inspection - Inspect  the  complete system  including  the 
three-way  catalytic converter.  Inspect  the  body  near 
the exhaust  system. 
Look  for broken,  damaged,  missing or out-of-position  parts, 
as well as, 
open  seams, holes, loose  connections  or other conditions  which  could cause 
a  heat  buildup 
in the  floor  pan or could let exhaust  fumes seep into the 
passenger  compartments. 
Drive  Axle  Service? - Check  readfront  axle tluid  level  and  add as needed, 
Check constant  velocity joints and axle seals  for leaking. 
Transfer  Case  (Four-wheel  Drive)  Inspection+ - Every 12 months  or at 
oil change  intervals,  check  front axle and transfer case  and  add  lubricant 
when  necessary.  Oil  the  control  lever  pivot  point  and  all  exposed control 
linkage.  Check 
vent hose  at  transfer  case for kinks  and  proper  installation. 
More frequent  lubrication  may  be  required  on  heavy-duty or off-road  use. 
?A fluid  loss in these  systems  may indicate  a problem.  Have  them  inspected 
and  repaired  at  once. 
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