GASOLINE  ENGINES WITH HEAVY  DUTY  EMISSIONS 
- MAINTENANCE  SCHEDULE yf 
Item Miles (000) 3 
No. Kilometers (000) 5 Service 
I 
1 Engine  Oil  Change*-Every 3 Months,  or t 
Oil  Filter  Change*-Every 3 Months,  or t 
12 Chassis  Lubrication-Every 12 Months,  or I+ 
II 
3 Clutch  Fork  Ball  Stud  Lubrication  (5-speed  manual 
transmission  with  deeplow only) 
Cooling  System  Service*-Every  24  Months or 
Air  Cleaner  Filter  Replacement*  Front  Wheel  Bearing  Repack 
Transmission  Service 
** 
Fuel  Filter  Replacement* 
10 
11 
12 
13 
14 
15 
16 
17 
18 
I9 
Spark  Plugs  Replacement* 
Spark  Plug  Wire  Inspection* 
EGR  System  Inspection* 
Electronic  Vacuum  Regulator  Valve  (EVRV) 
Inspection* 
Engine  Timing  Checkk 
Fuel  Tank,  Cap  and  Lines  Inspection 
* 
Thermostatically  Controlled  Air  Cleaner 
Inspectionk 
Engine  Accessory  Drive  (Serpentine)  Belt 
Inspection* 
Evaporative  Control  System  Inspection* 
Shields  and  Underhood  Insulation  InspectionA. 
20 
21 
- 
23 
24 
- 
Air  Intake  System  InspectionA. I 
Brake  Systems  Inspection** I 
* An  Emission  Control  Service 
** See  “Explanation  of Scheduled  Maintenance  Services”  in  the  Index. 
A A Noise  Emission Control Service 
Applicable  only to vehicles  sold  in the  United  States 
t To determine  the  emissions  classification of your  engine,  refer to “Selecting  the  Proper 
Maintenance  Chart”  in this  section. 
TO404 
7-10 
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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* - 
7-20 
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