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.
CAPACITIES
| Application | Cold Crank Amps @ 0°F (-18°C) | Reserve Minutes | |
|---|---|---|---|
| 2.5L (VIN E) | 525 | 90 | |
| 2.8L (VIN R) | 525 | 90 | |
| 3.1L (VIN D) | 525 | 90 | |
| 4.3L (VIN Z) | |||
| Standard | 525 | 90 | |
| Heavy Duty | 630 | 115 | |
| 5.0L (VIN H) | |||
| Standard | 430 | 90 | |
| Heavy Duty | 525 | 90 | |
| 5.7L (VIN K) | |||
| Standard | 525 | 90 | |
| Heavy Duty | 630 | 115 | |
| 6.2L (VIN C) | 570 | 90 | |
| 7.4L (VIN N) | 630 | 115 | |
BATTERY SPECIFICATIONS
| Application | (1) Quantity - Qts. (L) | ||
|---|---|---|---|
| Crankcase | |||
| 2.5L (VIN E) | (2) 3.0 (2.8) | ||
| 2.8L (VIN R) | (2) 4.0 (3.8) | ||
| 3.1L (VIN D) | (2) 4.0 (3.8) | ||
| 4.3L (VIN Z) | (2) 4.0 (3.8) | ||
| 5.0L (VIN H) | (2) 4.0 (3.8) | ||
| 5.7L (VIN K) | (2) 4.0 (3.8) | ||
| 6.2L (VIN C) | 7.0 (6.5) | ||
| 7.4L (VIN N) | (2) 5.0 (4.7) | ||
| Cooling System (Includes Heater) | |||
| 2.5L (VIN E) | 11.5 (11.0) | ||
| 2.8L (VIN R) | 10.5 (10.0) | ||
| 3.1L (VIN D) | 13.0 (12.3) | ||
| 4.3L (VIN Z) | 13.5 (12.8) | ||
| 5.0L (VIN H) | 18.0 (17.0) | ||
| 5.7L (VIN K) | 18.0 (17.0) | ||
| 6.2L (VIN C) | 25.0 (23.5) | ||
| 7.4L (VIN N) | 25.0 (23.5) | ||
| Automatic Transaxle (Dexron-II) (3) | |||
| 3.1L (VIN D) | 4.0 (3.8) | ||
| Automatic Transmission (Dexron-II) (3) | |||
| 2.5L (VIN E) | 5.0 (4.7) | ||
| 2.8L (VIN R) | 5.0 (4.7) | ||
| 4.3L (VIN Z) | 5.0 (4.7) | ||
| All V8 Engines | |||
| THM 400 | 4.2 (4.0) | ||
| THM 700 | 5.0 (4.7) | ||
| Manual Transmission | |||
| 2.5L (VIN E) | (4) 2.2 (2.0) | ||
| 2.8L (VIN R) | (4) 2.2 (2.0) | ||
| 4.3L (VIN Z) | (4) 2.2 (2.0) | ||
| All V8 Engines | |||
| 4-Speed (117 mm) | (4) 4.2 (4.0) | ||
| 4-Speed (85 mm) | (4) 1.8 (1.7) | ||
| 5-Speed (85 mm) | (4) 1.8 (1.7) | ||
| 5-Speed Overdrive (85 mm) | (5) 1.8 (1.7) | ||
| (1) Fluid capacities listed are approximate. Always fill to FULL mark. (2) Does not include oil filter capacity. (3) Drain and refill capacity only. Does not include torque converter. (4) Dexron-II. (5) Manual Trans. Fluid (1052931). | |||
| (1) | Fluid capacities listed are approximate. Always fill to FULL mark. |
| (2) | Does not include oil filter capacity. |
| (3) | Drain and refill capacity only. Does not include torque converter. |
| (4) | Dexron-II. |
| (5) | Manual Trans. Fluid (1052931). |
FLUID CAPACITIES
SERVICE INTERVALS & SPECIFICATIONS
| Component | Interval (Miles) |
|---|---|
| Oil & Filter | (1) 7500 |
| Air Filter | 30,000 |
| Coolant | 30,000 |
| Fuel Filter | (2) 60,000 |
| Spark Plugs | 30,000 |
| (1) Gasoline engines only. On diesel engines, replace every 5000 miles. (2) Gasoline engines only. On diesel engines, replace every 30,000 miles. | |
| (1) | Gasoline engines only. On diesel engines, replace every 5000 miles. |
| (2) | Gasoline engines only. On diesel engines, replace every 30,000 miles. |
REPLACEMENT INTERVALS
| Application | Tension |
|---|---|
| All Models | (1) |
| (1) All models are equipped with serpentine belts. Belt tension is maintained by automatic tensioner and is not adjustable. Check for missing belt ribs and if belt is within tensioner's operating length or range. Replace as necessary. | |
| (1) | All models are equipped with serpentine belts. Belt tension is maintained by automatic tensioner and is not adjustable. Check for missing belt ribs and if belt is within tensioner's operating length or range. Replace as necessary. |
BELT ADJUSTMENT
ENGINE COMPRESSION
| Application | Compression Ratio |
|---|---|
| 2.5L (VIN E) | 8.3:1 |
| 2.8L (VIN R) | 8.9:1 |
| 3.1L (VIN D) | 8.9:1 |
| 4.3L (VIN Z) | 9.3:1 |
| 5.0L (VIN H) | 9.3:1 |
| 5.7L (VIN K) | 8.2:1 |
| 6.2L Diesel (VIN C) | 21.3:1 |
| 7.4L (VIN N) | 7.9:1 |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
Note. All models are equipped with hydraulic lifters. No adjustments are required.
2.5L (VIN E)
I-E-I-E-E-I-E-I (Front-to-rear).
2.8L (VIN R)
Left Bank - E-I-I-E-I-E (Front-to-rear).
Right Bank - E-I-E-I-I-E (Front-to-rear).
3.1L (VIN D)
Left Bank - E-I-I-E-I-E (Front-to-rear).
Right Bank - E-I-E-I-I-E (Front-to-rear).
4.3L (VIN Z)
Left Bank - E-I-E-I-I-E (Front-to-rear).
Right Bank - E-I-I-E-I-E (Front-to-rear).
5.0L (VIN H)
Both Banks - E-I-I-E-E-I-I-E (Front-to-rear).
5.7L (VIN K)
Both Banks - E-I-I-E-E-I-I-E (Front-to-rear).
6.2L (VIN C)
Left Bank - I-E-I-E-I-E-I-E (Front-to-rear).
Right Bank - E-I-E-I-E-I-E-I (Front-to-rear).
7.4L (VIN N)
Left Bank - E-I-E-I-E-I-E-I (Front-to-rear).
Right Bank - I-E-I-E-I-E-I-E (Front-to-rear).
IGNITION COIL
| Application | Ohms |
|---|---|
| All Models w/HEI-EST | 500-1500 |
PICK-UP COIL RESISTANCE
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|---|
| All Models | 30,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | AC |
|---|---|
| 2.5L (VIN E) | R43TS6 |
| 2.8L (VIN R) | R43TSK |
| 3.1L (VIN D) | R43TS |
| 4.3L (VIN Z) | CR43TS |
| 5.0L (VIN H) | CR43TS |
| 5.7L (VIN K) | CR43TS |
| 7.4L (VIN N) | CR43RS |
SPARK PLUG TYPE
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|---|---|
| 2.5L (VIN E) | .060 (1.52) | 17 (23) |
| 2.8L (VIN R) | .060 (1.52) | 22 (30) |
| 3.1L (VIN D) | .045 (1.14) | 18 (24) |
| 4.3L (VIN Z) | .035 (0.89) | 22 (30) |
| 5.0L (VIN H) | .035 (0.89) | 11 (15) |
| 5.7L (VIN K) | .035 (0.89) | 11 (15) |
| 7.4L (VIN N) | .035 (0.89) | 11 (15) |
SPARK PLUG SPECIFICATIONS
2.5L (VIN E) Firing Order & Timing Marks. Scheme 1
2.8L (VIN R) Firing Order & Timing Marks. Scheme 2
3.1L (VIN D) Firing Order & Timing Marks. Scheme 3
4.3L (VIN Z) Firing Order & Timing Marks. Scheme 4
5.0L, 5.7L & 7.4L Firing Order & Timing Marks. Scheme 5
6.2L Diesel Engine Firing Order. Scheme 6
IGNITION TIMING
Note. For timing procedures, see ADJUSTMENTS article.
| Application | (1) Manual Transmission | (2) Automatic Transmission |
|---|---|---|
| 2.5L (VIN E) | 8 @ Idle | 8 @ Idle |
| 2.8L (VIN R) | 10 @ Idle | 10 @ Idle |
| 3.1L (VIN D) | 10 @ Idle | 10 @ Idle |
| 4.3L (VIN Z) | 0 @ Idle | 0 @ Idle |
| 5.0L (VIN H) | 0 @ Idle | 0 @ Idle |
| 5.7L (VIN K) | 0 @ Idle | 0 @ Idle |
| 7.4L (VIN N) | 4 @ Idle | 4 @ Idle |
| (1) Set in Neutral. (2) Set in Neutral or Park. | ||
| (1) | Set in Neutral. |
| (2) | Set in Neutral or Park. |
IGNITION TIMING (Degrees BTDC @ RPM)
FUEL PUMP
| Application | Psi (kg/cm 2 ) |
|---|---|
| 6.2L Diesel (VIN C) | 8-12 (.5-.8) |
| All Others | 9-13 (.63-.91) |
FUEL PUMP PERFORMANCE
INJECTOR RESISTANCE
| Application | Resistance (Ohms) |
|---|---|
| All Except 3.1L (VIN U) | 1.3 |
| 3.1L (VIN U) | 1.2 |
INJECTOR RESISTANCE SPECIFICATIONS (At 140°F (60°C))
IDLE SPEED & MIXTURE
Note. Idle mixture on fuel injected models is controlled by the ECM and is not adjustable.
THROTTLE POSITION SENSOR (TPS)
Note. TPS is adjustable only on 2.8L (VIN R) and 6.2L Diesel (VIN C) engines. For further testing, refer to appropriate TESTS W/CODES article.
| Application | (1) (2) Voltage |
|---|---|
| 2.8L (VIN R) | .42-.45 |
| 6.2L Diesel (VIN U) | 1.2 |
| (1) At idle RPM or closed throttle. (2) This is a TPS Voltage Ratio. For adjustment procedure see ADJUSTMENTS article in the ENGINE PERFORMANCE Section. | |
| (1) | At idle RPM or closed throttle. |
| (2) | This is a TPS Voltage Ratio. For adjustment procedure see ADJUSTMENTS article in the ENGINE PERFORMANCE Section. |
TPS ADJUSTMENT VOLTAGE