MODEL IDENTIFICATION
Vehicle model is identified by fifth character of Vehicle Identification Number (VIN). VIN is stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION table.
| Series (1) | Model |
|---|
| "A" | 2WD Aztek |
| "B" | 4WD Aztek |
| "C" | 2WD Cab & Chassis, Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon |
| "E" | 2WD Tracker |
| "G" | Cutaway, Express, RV Cutaway & Savana |
| "J" | 4WD Tracker |
| "K" | 4WD Cab & Chassis, Pickup, Sierra, Silverado, Suburban, Tahoe & Yukon |
| "L" | AWD Astro & Safari |
| "M" | 2WD Astro & Safari |
| "S" | 2WD Blazer, Jimmy, Sonoma & S10 Pickup |
| "T" | AWD/4WD Blazer, Bravada, Jimmy, Sonoma & S10 Pickup |
| "U" | Montana, Silhouette & Venture |
| (1) Vehicle series is fifth character of VIN. |
| (1) | Vehicle series is fifth character of VIN. |
INTRODUCTION
Use this article to quickly find specifications related to servicing and on-vehicle adjustments. This article may be used for quick reference when you are familiar with proper adjustment procedures and only need a specification.
ENGINE OIL CAPACITY
| Application | (2) Quantity Qts. (L) |
|---|
| 2.0L | 5.5 (5.2) |
| 2.2L, 3.4L & 4.3L | 4.5 (4.3) |
| 2.5L | 5.8 (5.5) |
| 4.8L, 5.3L & 6.0L | 6.0 (5.7) |
| 5.0L & 5.7L | 5.0 (4.8) |
| 6.5L | 8.0 (7.6) |
| 6.6L | 10.0 (9.5) |
| 8.1L | 6.5 (6.1) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes oil filter capacity. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Includes oil filter capacity. |
FLUID CAPACITY (CRANKCASE) (1)
COOLING SYSTEM FLUID CAPACITY
| Application | (2) Quantity Qts. (L) |
|---|
| 2.0L | 6.9 (6.5) |
| 2.2L | 9.9 (9.4) |
| 2.5L | 8.5 (8.0) |
| 3.4L |
| "A" & "B" Series | 9.6 (9.2) |
| "U" Series |
| Standard |
| With Front A/C Only | 9.5 (9.1) |
| With Front & Rear A/C | 11.9 (11.3) |
| Heavy-Duty |
| With Front A/C Only | 10.5 (10.1) |
| With Front & Rear A/C | 13.2 (12.6) |
| 4.3L |
| "C" & "K" Series | 12.9 (12.2) |
| "G" Series |
| With Rear Heater | 14.0 (13.2) |
| Without Rear Heater | 11.0 (10.4) |
| "L" & "M" Series |
| With Rear Heater | 16.5 (15.6) |
| Without Rear Heater | 13.5 (12.8) |
| "S" & "T" Series |
| Pickup | 14.3 (13.3) |
| Utility | 11.9 (11.3) |
| 4.8L |
| Automatic Transmission | 13.4 (12.7) |
| Manual Transmission | 13.7 (13.0) |
| 5.0L |
| With Rear Heater | 20.0 (18.9) |
| Without Rear Heater | 17.0 (16.0) |
| 5.3L |
| With Front A/C Only | 14.9 (14.1) |
| With Front & Rear A/C | 15.8 (15.0) |
| Without A/C | 13.4 (12.7) |
| 5.7L |
| "C" & "K" Series |
| Standard |
| With A/C | 20.0 (18.9) |
| Without A/C | 17.5 (16.6) |
| Heavy-Duty |
| With A/C | 27.0 (25.5) |
| Without A/C | 26.5 (25.0) |
| "G" Series |
| With Rear Heater | 20.0 (18.9) |
| Without Rear Heater | 17.0 (16.0) |
| 6.0L |
| Automatic Transmission |
| With Optional Oil Cooler | 14.4 (13.6) |
| Without Optional Oil Cooler | 14.8 (14.0) |
| Manual Transmission |
| With Optional Oil Cooler | 14.8 (14.0) |
| Without Optional Oil Cooler | 15.2 (14.4) |
| 6.5L |
| "C" & "K" Series |
| With Rear Heater | 27.5 (26.0) |
| Without Rear Heater | 23.5 (22.2) |
| "G" Series |
| With Rear Heater | 27.5 (26.0) |
| Without Rear Heater | 23.5 (22.2) |
| 6.6L | 20.7 (19.6) |
| 8.1L |
| "C", "G" & "K" Series |
| With Rear Heater | 26.0 (24.6) |
| Without Rear Heater | 23.0 (21.8) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Includes heater. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
FLUID CAPACITY (COOLING SYSTEM) (1)
AUTOMATIC TRANSMISSION FLUID CAPACITY
| Application | (2) Quantity Qts. (L) |
|---|
| "A", "B" & "U" Series (4T65-E) | 7.4 (7.0) |
| "C" & "K" Series |
| Allison LCT 1000 | 7.4 (7.0) |
| 4L60-E | 5.0 (4.8) |
| 4L80-E | 7.7 (7.3) |
| "E" & "J" Series (AW03-72LE) | 2.6 (2.5) |
| "G" Series |
| 4L60-E | 5.0 (4.8) |
| 4L80-E | 7.7 (7.3) |
| "L" & "M" Series (4L60-E) | 5.0 (4.8) |
| "S" & "T" Series (4L60-E) | 5.0 (4.8) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark with Dexron-III. (2) Drain and refill capacity only. Does not include torque converter, unless specified otherwise. |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark with Dexron-III. |
| (2) | Drain and refill capacity only. Does not include torque converter, unless specified otherwise. |
FLUID CAPACITY (AUTOMATIC TRANSMISSION) (1)
MANUAL TRANSMISSION FLUID CAPACITY
| Application | Quantity Pts. (L) |
|---|
| "C" & "K" Series |
| NV3500 | (2) 4.2 (2.0) |
| NV4500 | (3) 8.0 (3.8) |
| ZF S6-650 | (4) 13.0 (6.2) |
| "E" & "J" Series |
| 2WD | (3) 4.0 (1.9) |
| 4WD | (3) 3.2 (1.5) |
| "S" & "T" Series |
| 2.2L (NV1500) | (5) 5.7 (2.7) |
| 4.3L (NV3500) | (2) 4.2 (2.0) |
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Synchromesh Transmission Fluid (GM 12345349). (3) SAE 75W-85 GL4 Synthetic Lubricant (GM 12346190). (4) TranSynd™ Synthetic ATF (GM 12378515). (5) Synchromesh Transmission Fluid (GM 12377916). |
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Synchromesh Transmission Fluid (GM 12345349). |
| (3) | SAE 75W-85 GL4 Synthetic Lubricant (GM 12346190). |
| (4) | TranSynd™ Synthetic ATF (GM 12378515). |
| (5) | Synchromesh Transmission Fluid (GM 12377916). |
FLUID CAPACITY (MANUAL TRANSMISSION) (1)
SERVICE INTERVALS & SPECIFICATIONS
| Component | Interval (Miles) |
|---|
| "A" & "B" Series |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter (Engine) | 30,000 |
| Air Filter (Passenger Compartment) | 15,000 |
| Fuel Filter | (2) |
| Oil & Filter | 3000 |
| Spark Plug | 100,000 |
| "C", "K", "L", "M", "S" & "T" Series |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter | 30,000 |
| Engine Coolant | 150,000 |
| Fuel Filter | 30,000 |
| Oil & Filter | (3) 3000 |
| Spark Plugs | 100,000 |
| "E" & "J" Series |
| Accessory Drive Belt | (1) 30,000 |
| Air Filter | 30,000 |
| Engine Coolant | 30,000 |
| Fuel Filter | 30,000 |
| Oil & Filter | 3000 |
| Spark Plug | 60,000 |
| Spark Plug Wires | 60,000 |
| "G" Series |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter | 30,000 |
| Engine Coolant | 150,000 |
| Fuel Filter | 30,000 |
| Oil & Filter | (3) 3000 |
| Spark Plugs | 100,000 |
| "U" Series |
| Accessory Drive Belt | (1) 60,000 |
| Air Filter | 30,000 |
| Engine Coolant | 150,000 |
| Fuel Filter | (2) |
| Oil & Filter | 7500 |
| Spark Plugs | 100,000 |
| (1) Inspect and replace as necessary. (2) No scheduled replacement interval is given by manufacturer. Check and replace as necessary. (3) On diesel engines, change every 2500 miles. |
| (1) | Inspect and replace as necessary. |
| (2) | No scheduled replacement interval is given by manufacturer. Check and replace as necessary. |
| (3) | On diesel engines, change every 2500 miles. |
BELT TENSION
| Application | (1) Belt Deflection |
|---|
| 2.0L |
| Accessory Drive Belt | (2) |
| Water Pump |
| New Belt | 0.16-0.19" (4.1-4.8 mm) |
| Used Belt (3) | 0.20-0.27" (5.1-6.9 mm) |
| 2.5L |
| A/C Compressor | 0.16-0.28" (4.1-7.1 mm) |
| Generator/Water Pump |
| New Belt | 0.28-0.35" (7.1-8.9 mm) |
| Used Belt (3) | 0.35-0.43" (8.9-11.0 mm) |
| Power Steering | 0.16-0.28" (4.1-7.1 mm) |
| All Others (Serpentine Belt) | (2) |
| (1) Deflection is with 22 lbs. (10 kg) pressure applied midway on longest belt run. (2) Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator). (3) Used belt is a belt in operation for more than 5 minutes. |
| (1) | Deflection is with 22 lbs. (10 kg) pressure applied midway on longest belt run. |
| (2) | Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator). |
| (3) | Used belt is a belt in operation for more than 5 minutes. |
ENGINE COMPRESSION
| Application | Specification |
|---|
| Normal Compression Pressure |
| 2.0L | 199 psi (14 kg/cm 2 ) |
| 2.5L | 199-227 psi (14-16 kg/cm 2 ) |
| 6.5L | (1) |
| 6.6L | 300 psi (21 kg/cm 2 ) |
| All Others | (2) |
| Minimum Compression Pressure |
| 2.0L | 170 psi (12 kg/cm 2 ) |
| 2.5L | 185 psi (13 kg/cm 2 ) |
| 6.5L | (1) |
| 6.6L | 250 psi (18 kg/cm 2 ) |
| All Others | (2) |
| (1) Lowest compression reading should not be less than 80 percent of highest compression reading. No cylinder compression reading should be less than 370 psi (27 kg/cm 2 ). (2) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). |
| (1) | Lowest compression reading should not be less than 80 percent of highest compression reading. No cylinder compression reading should be less than 370 psi (27 kg/cm 2 ). |
| (2) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (7 kg/cm 2 ). |
ENGINE COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | In. (mm) |
|---|
| 6.6L |
| Intake & Exhaust | 0.012 (0.3) |
| All Others | (1) |
| (1) Equipped with hydraulic lifters. Adjustment is not required. |
| (1) | Equipped with hydraulic lifters. Adjustment is not required. |
VALVE CLEARANCE SPECIFICATIONS
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| 2.0L & 2.5L | (1) |
| 2.2L | 12,000 Per Ft. |
| 3.4L | 3000 Per Ft. |
| 4.3L, 4.8L, 5.3L, 6.0L & 8.1L | 1000 Per Ft. |
| 5.0L & 5.7L | 700 Per Ft. |
| (1) Not equipped with high tension secondary wires. |
| (1) | Not equipped with high tension secondary wires. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Type | Part No. |
|---|
| 2.0L & 2.5L | Denso | SK16PR11 |
| 2.2L | AC | 41-948 |
| 3.4L | AC | 41-940 |
| 4.3L | AC | R41-932 |
| 4.8L, 5.3L & 6.0L | GM | 25171803 |
| 5.0L & 5.7L | AC | 41-952 |
| 8.1L | Denso | TJ14R-P15 |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| 2.0L & 2.5L | .039-.043 (1.0-1.1) | 18 (25) |
| 2.2L | .040 (1.02) | 13 (18) |
| 8.1L | .060 (1.52) | 15 (20) |
| All Others | .060 in. (1.52 mm)/ | 11 (15) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Scheme 1
Scheme 1: Firing Order (2.0L & 2.2L)
Scheme 2
Scheme 2: Firing Order (2.5L)
Scheme 3
Scheme 3: Firing Order (3.4L "A" & "B" Series)
Scheme 4
Scheme 4: Firing Order (3.4L "U" Series)
Scheme 5
Scheme 5: Firing Order (4.3L)
Scheme 6
Scheme 6: Firing Order (4.8L, 5.3L, 6.0L & 8.1L)
Scheme 7
Scheme 7: Firing Order (5.0L & 5.7L)
IGNITION TIMING (GASOLINE)
All models are equipped with an electronic computer-controlled ignition system. Timing on this system is only adjustable on Tracker equipped with 2.0L and 2.5L engines. Timing should be set to 5 degrees BTDC. For adjustment procedure, see ON-VEHICLE ADJUSTMENTS - TRUCKS - TRACKER article.
INJECTION PUMP TIMING (DIESEL)
Injection pump timing can be checked using scan tool. For adjustment procedure, see ON-VEHICLE ADJUSTMENTS - TRUCKS - EXCEPT TRACKER article.
FUEL PUMP
| Application | Psi (kg/cm 2 ) |
|---|
| 2.0L & 2.5L | (1) 36-43 (2.5-3.0) |
| 2.2L | 41-47 (2.9-3.3) |
| 3.4L | 52-59 (3.7-4.1) |
| 4.3L | 60-66 (4.2-4.6) |
| 4.8L, 5.3L, 6.0L & 8.1L | 55-62 (3.9-4.4) |
| 5.0L & 5.7L | 55-60 (3.9-4.2) |
| 6.5L & 6.6L | 1450 (102) |
| (1) Pressure should maintain at least 26 psi (1.8 kg/cm 2 ) for one minute after fuel pump is turned off. |
| (1) | Pressure should maintain at least 26 psi (1.8 kg/cm 2 ) for one minute after fuel pump is turned off. |
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| 2.0L | 13-16 |
| 2.2L | 2.0-2.3 |
| 2.5L | 9-14 |
| All Others | 11-14 |
| (1) Injector resistance specification is at 50-95°F (10-35°C). |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
INJECTOR RESISTANCE SPECIFICATIONS (1)
IDLE SPEED & MIXTURE
Note. Idle mixture is controlled by Powertrain Control Module (PCM). Idle speed is preset by manufacturer and is not adjustable.
THROTTLE POSITION (TP) SENSOR
Note. TP sensor is not adjustable unless specified otherwise. For further testing procedures, refer to appropriate SELF-DIAGNOSTICS or SYSTEM & COMPONENT TESTING article.
Note. On some engines, throttle control is electronic with NO mechanical link from engine to accelerator pedal. The PCM monitors the position of accelerator pedal based on signals from a non-adjustable Accelerator Pedal Position (APP) module. The APP module is mounted above the accelerator pedal.
| Application | Voltage |
|---|
| 2.0L & 2.5L | 0.5-1.2 To 3.4-4.7 |
| 2.2L, 3.4L, 4.3L, 4.8L, 5.3L & 6.0L | 1.0-4.0 |
| 5.0L & 5.7L | .5-4.5 |
| 8.1L |
| Sensor 1 | (1) .4-.9 |
| Sensor 2 | (1) 4.3-4.8 |
| (1) At idle. |
THROTTLE POSITION (TP) SENSOR VOLTAGE
