1990 SUBURBAN MAINTENANCE SCHEDULE

This page is dedicated to the maintenance and service schedule for 1990 Suburban and 1990 Light Trucks for Chev and GMC. The information here came straight out of the 1990 Light Truck General Motors Maintenance Schedule. The maintenance schedule booklet accompanies with the owners manual and would have been in the glove box of your Suburban. If you have any information and would like to contribute, please email me.

First determine which maintenance schedule you should follow.

Maintenance Schedule 1, denoted by a plus sign (+), are vehicles driven under one or more of the following conditions:
When most trips are less than 4 miles (6 kilometers)
When most trips are less than 10 miles (16 kilometers) and outside temperatures remain below freezing

Maintenance Schedule 2, denoted by a black circle (), are for vehicles where none of the driving conditions in Maintenance Schedule 1 apply.

 

Maintenance Schedule for LIGHTY DUTY Emission Engines

Light Duty emission engines are determined by the engine size and Vin Code. Light Duty Emission Engines are:

2.5L L4/TBI (8th digit of VIN is E)
2.8L V6/TBI (8th digit of VIN is R)
4.3L V6/TBI Except P Model (8th digit of VIN is Z)
4.3L V6/TBI/H.O. (8th digit of VIN is B)
5.0L V8/TBI (8th digit of VIN is H)
5.7L V8/TBI Except G31303, P Models, 8500 GVWR and below (8th digit of VIN is K)
6.2L V8/Diesel (8th digit of VIN is C)
7.4L V8/TBI Except with RPO B4U (8th digit of VIN is N)

+   Maintenance Schedule 1       Maintenance Schedule 2

Item # The services shown in this schedule up to 60k mi / 100k km) are to be performed after 60k mi / 100k km at the same intervals
Service Miles (000)  3   6  7.5  9  12 15 18 21 22.5 24 27 30 33 36 37.5 39 42 45 48 51 52.5 54 57 60
Km (000)  5  10 12.5 15 20 25 30 35 37.5 40 45 50 55 60 62.5 65 70 75 80 85 87.5 90 95 100
1 Engine Oil Change
   (every 3 mos, or)
+ + + + + + + + + + + + + + + + + + + +
   (every 12 mos, or)
Oil Filter Change
   (every 3 mos, or)
+ + + + + + + + + + + + + + + + + + + +
   (every 12 mos, or)
2A Chassis Lubrication
   (every 12 mos, or)
+ + + + + • + + + + + • + + + + + • + + + + + •
2B Clutch For Ball Stud Lubrication + • + •
4 Cooling System Service *
   (every 24 mos, or)
+ • + •
5 Air Cleaner Element Replacement + • +
6 Front Wheel Bearing Repack (2WD Only) + + • + + •
7 Transmission Service - Refer to Section B
8A PVC System Inspection * + •
9 Fuel Filter Replacement * + •
12 Spark Plugs Replacement * + + •
13 Spark Plug Wire Inspection * + • + •
15 Electronic Vacuum Regulator Valve (EVRV) Inspection * + •
16 Engine Timing Check * + •
17 Fuel Tank, Cap and Lines Inspection * + + •
20 Engine Accessory Drive Belt(s) Inspection * + •
31 Tire and Wheel Rotation + + + +
32 Drive Axle Service + + + + + • + + + + + • + + + + + • + + + + + •

 

Maintenance Schedule for HEAVY DUTY Emission Engines

Heavy Duty emission engines are determined by the engine size and Vin Code. Heavy Duty Emission Engines are:
4.3L V6/TBI P Model
5.7L V8/TBI G31303, P Models, 8501 GVWR and above (8th digit of VIN is K)
6.2L V8/Diesel (8th digit of VIN is J)
7.4L V8/TBI Except with RPO B4U (8th digit of VIN is N)

 

 

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