ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Normal Compression Pressure |
| 1.3L | (1) 192 psi (13.5 kg/cm 2 ) |
| 1.8L | (1) 218 psi (15.3 kg/cm 2 ) |
| 1.9L | 190 psi (13.4 kg/cm 2 ) |
| 2.2L, 2.4L, 3.0L, 3.1L, 3.4L, 3.8L & 5.7L | (2) |
| 3.5L, 4.0L & 4.6L | (3) |
| Minimum Compression Pressure |
| 1.3L | (1) 156 psi (11.0 kg/cm 2 ) |
| 1.8L | (1) 145 psi (10.2 kg/cm 2 ) |
| 1.9L | 180 psi (12.7 kg/cm 2 ) |
| 2.2L, 2.4L, 3.0L, 3.1L, 3.4L, 3.8L & 5.7L | (2) |
| 3.5L, 4.0L & 4.6L | (3) |
| (1) No cylinder compression reading should be less than 15 psi (1.1 kg/cm 2 ) of highest compression reading. (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 (7.0 kg/cm 2 ). (3) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 140 psi (9.8 kg/cm 2 ). |
| (1) | No cylinder compression reading should be less than 15 psi (1.1 kg/cm 2 ) of highest compression reading. |
| (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 (7.0 kg/cm 2 ). |
| (3) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 140 psi (9.8 kg/cm 2 ). |
ENGINE COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | In. (mm) |
|---|
| "S" Body |
| Intake | (1) .006-.010 (.15-.25) |
| Exhaust | (1) .010-.014 (.25-.35) |
| All Others | (2) |
| (1) Adjustments are made with engine cold 77°F (25°C). (2) Equipped with hydraulic lifters. Adjustment is not required. |
| (1) | Adjustments are made with engine cold 77°F (25°C). |
| (2) | Equipped with hydraulic lifters. Adjustment is not required. |
VALVE CLEARANCE SPECIFICATIONS
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| 1.3L | Less Than 30,000 |
| 1.8L, 2.4L, 3.0L, 3.5L & 4.6L | (1) |
| 1.9L | 1500-15,000 Per Ft. |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | 12,000 Per Ft. |
| Saturn ("L" Series) | (1) |
| 3.1L & 3.4L | 3000 Per Ft. |
| 3.8L |
| Except Police | 3000 Per Ft. |
| Police | 600 Per Ft. |
| 5.7L |
| "F" Body | 700 Per Ft. |
| "Y" Body | 700 Or Less Per Ft. |
| (1) Not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. |
| (1) | Not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. |
HIGH TENSION WIRE RESISTANCE
FIRING ORDER
Note. For Saturn 1.9L engine, the coil pack spark plug wire positions and routing are different from the firing order, which is controlled internally by the ECU. For firing order information (Scheme 1) For spark plug wire positions and routing (Scheme 8)and (Scheme 9).
Scheme 1
Scheme 1: Firing Order (1.3L, 1.8L, 1.9L, 2.2L & 2.4L)
Scheme 2
Scheme 2: Firing Order & Spark Plug Wire Routing (3.1L & 3.4L)
Scheme 3
Scheme 3: Firing Order (3.0L & 3.5L)
Scheme 4
Scheme 4: Firing Order (3.8L - Except "F" Body)
Scheme 5
Scheme 5: Firing Order (3.8L - "F" Body)
Scheme 6
Scheme 6: Firing Order (4.0L& 4.6L)
Scheme 7
Scheme 7: Firing Order (5.7L)
Scheme 8
Scheme 8: Saturn 1.9L Spark Plug Wire Routing
Scheme 9
Scheme 9: Saturn 1.9L Coil Pack Spark Plug Wire Routing
IGNITION TIMING
Note. All models are equipped with an electronic computer-controlled ignition system. Timing is not adjustable.
FUEL PUMP
| Application | (1) KOEO psi (kg/cm 2 ) |
|---|
| 1.3L | 39-44 (2.7-3.1) |
| 1.8L | 44-50 (3.1-3.5) |
| 1.9L | 40-55 (2.8-3.9) |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | 53-59 (3.8-4.2) |
| Saturn ("L" Series) | 50-60 (3.5-4.2) |
| 2.4L | 53-59 (3.8-4.2) |
| 3.0L |
| "J" Body | 39-49 (2.7-3.4) |
| "V" Body | 40-46 (2.8-3.2) |
| 3.5L & 4.6L | 41-47 (2.9-3.3) |
| 3.1L & 3.4L | 52-59 (3.7-4.2) |
| 3.8L |
| VIN K | (2) 52-59 (3.7-4.2) |
| VIN 1 | 48-55 (3.4-3.9) |
| 4.0L | 41-47 (2.9-3.3) |
| 5.7L | 55-62 (3.9-4.4) |
| (1) KOEO is ignition key ON and engine OFF. (2) 48-54 psi (3.4-3.8 kg/cm 2 ) on Camaro and Firebird. |
| (1) | KOEO is ignition key ON and engine OFF. |
| (2) | 48-54 psi (3.4-3.8 kg/cm 2 ) on Camaro and Firebird. |
INJECTOR RESISTANCE
| Application | (1) Ohms |
|---|
| 1.3L | 12.0-13.0 |
| 1.8L | 13.4-14.4 |
| 1.9L | 12.0 |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | 11.0-14.0 |
| Saturn ("L" Series) | 12.0 |
| 2.4L, 3.1L, 3.4L, 3.5L, 3.8L, 4.0L, 4.6L & 5.7L | 11.0-14.0 |
| 3.0L |
| "J" Body | 14.0-23.0 |
| "V" Body | (2) |
| (1) Injector resistance specification is at 50-95°F (10-35°C). (2) Injector voltage is measured. Voltage reading should be 8.0-8.5 volts. |
| (1) | Injector resistance specification is at 50-95°F (10-35°C). |
| (2) | Injector voltage is measured. Voltage reading should be 8.0-8.5 volts. |
INJECTOR RESISTANCE SPECIFICATIONS
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 models, throttle control is electronic with NO mechanical link from engine to accelerator pedal. The PCM and Throttle Actuator Control (TAC) module monitors the position of accelerator pedal based on signals from a nonadjustable Accelerator Pedal Position (APP) sensor. The APP sensor is mounted above accelerator pedal.
| Application | (1) Volts |
|---|
| 1.3L | 0.2-1.0 To 4.8 |
| 1.8L | 0.1 To 4.9 |
| 1.9L | 0.4 To 4.7 |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | 0.1 |
| Saturn ("L" Series) | 0.4 To 4.7 |
| 2.4L, 3.0L, 3.1L, 3.4L, 3.5L, 3.8L, 4.0L & 4.6L | (2) |
| 5.7L ("F" Body) | (2) |
| (1) Voltage range is from idle position to wide open throttle position. (2) Voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. |
| (1) | Voltage range is from idle position to wide open throttle position. |
| (2) | Voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. |
TP SENSOR ADJUSTMENT VOLTAGE
