ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Normal Compression Pressure | Psi (kPa) |
| 1.8L | (1) 218 (1500) |
| 1.9L | 185-205 (1276-1414) |
| 3.5L |
| Aurora | 140-170 (965-1172) |
| Intrigue | (2) |
| 4.0L & 4.6L | 140-170 (965-1172) |
| All Others | (3) |
| Minimum Compression Pressure |
| 1.8L | (1) 145 (1000) |
| 1.9L | 180 psi (1241 kPa) |
| 3.5L |
| Aurora | (4) |
| Intrigue | (2) |
| 4.0L & 4.6L | (2) |
| All Others | (3) |
| (1) No cylinder compression reading should be less than 15 psi (100 kPa) 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 140 psi (965 kPa). (3) Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (690 kPa). (4) Information is not available from manufacturer. |
| (1) | No cylinder compression reading should be less than 15 psi (100 kPa) 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 140 psi (965 kPa). |
| (3) | Lowest compression reading should not be less than 70 percent of highest compression reading. No cylinder compression reading should be less than 100 psi (690 kPa). |
| (4) | Information is not available from manufacturer. |
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 |
|---|
| 1.9L | 1500-15,000 Per Ft. |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | (1) |
| Saturn ("L" Series) | (2) |
| "N" Body | (2) |
| 3.1L | 3000 Per Ft. |
| 3.4L |
| Except Impala & Monte Carlo | 3000 Per Ft. |
| Impala & Monte Carlo | 600 Per Ft. |
| 3.8L |
| Except Police | 3000 Per Ft. |
| Police | 600 Per Ft. |
| 5.7L | 700 Per Ft. |
| All Others | (2) |
| (1) Vehicles identified with 8th VIN character "F", are not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. On vehicles identified with 8th VIN character "4", resistance is 12,000 ohms per foot. (2) Not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. |
| (1) | Vehicles identified with 8th VIN character "F", are not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. On vehicles identified with 8th VIN character "4", resistance is 12,000 ohms per foot. |
| (2) | Not equipped with high tension wires. Ignition coils are connected directly to spark plugs by boots. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Spark Plug Type | Spark Plug No. |
|---|
| 1.8L | Denso | SR16R-11 |
| NGK | IFR5A-11 |
| 1.9L |
| DOHC | NGK | BKR5ESA-11 |
| SOHC | NGK | BKR4ESA-11 |
| 2.2L |
| Alero & Grand Am | AC | 41-981 |
| Cavalier & Sunfire | AC | (1) |
| Saturn ("L" Series) | AC | 41-628 |
| 2.4L | AC | 41-963 |
| 3.0L | Bosch | FLR9LTE |
| 3.1L & 3.4L | AC | 41-940 |
| 3.5L |
| Aurora | AC | 41-950 |
| Intrigue | AC | PTR5C-13 |
| 3.8L | AC | 41-921 |
| 4.0L | AC | 41-950 |
| 4.6L | AC | PT16EPR-C13 |
| 5.7L |
| Camaro & Firebird | AC | 41-952 |
| Corvette | AC | 41-974 |
| (1) Vehicles identified with 8th VIN character "F", use spark plug No. 41-981. Vehicles identified with 8th VIN character "4", use spark plug No. 41-928. |
| (1) | Vehicles identified with 8th VIN character "F", use spark plug No. 41-981. Vehicles identified with 8th VIN character "4", use spark plug No. 41-928. |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| 1.8L | .040-.043 (1.02-1.09) | 13 (18) |
| 1.9L | .040 (1.02) | 20 (27) |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | (1) | (2) |
| Saturn ("L" Series) | .045 (1.14) | 15 (20) |
| "N" Body |
| Alero & Grand Am | .042 (1.07) | 15 (20) |
| Malibu | .60 (1.52) | 11 (15) |
| 2.4L | .050 (1.27) | 13 (18) |
| 3.0L | .040 (1.02) | 18 (25) |
| 3.1L & 3.8L | .060 (1.52) | 11 (15) |
| 3.4L |
| Except Impala & Monte Carlo | .060 (1.52) | 11 (15) |
| Impala & Monte Carlo | .060 (1.52) | 20 (27) |
| 3.5L |
| Aurora | .050 (1.27) | 15 (20) |
| Intrigue | .060 (1.52) | 15 (20) |
| 4.0L | .050 (1.27) | 13-16 (18-22) |
| 4.6L |
| Deville & Seville | .050 (1.27) | 13-17 (18-23) |
| Eldorado | .050 (1.27) | 11 (15) |
| 5.7L |
| Camaro & Firebird | .060 (1.52) | 11 (15) |
| Corvette | .060 (1.52) | (3) |
| (1) On vehicles identified with 8th VIN character "F", gap is .042" (1.07 mm). On vehicles identified with 8th VIN character "4", gap is .040" (1.02 mm). (2) On vehicles identified with 8th VIN character "F", torque is 15 ft. lbs. (20 N.m). On vehicles identified with 8th VIN character "4", torque is 13 ft. lbs. (18 N.m). (3) Torque spark plugs on new heads to 20 ft. lbs. (27 N.m). Torque spark plugs on used heads to 11 ft. lbs. (15 N.m). |
| (1) | On vehicles identified with 8th VIN character "F", gap is .042" (1.07 mm). On vehicles identified with 8th VIN character "4", gap is .040" (1.02 mm). |
| (2) | On vehicles identified with 8th VIN character "F", torque is 15 ft. lbs. (20 N.m). On vehicles identified with 8th VIN character "4", torque is 13 ft. lbs. (18 N.m). |
| (3) | Torque spark plugs on new heads to 20 ft. lbs. (27 N.m). Torque spark plugs on used heads to 11 ft. lbs. (15 N.m). |
SPARK PLUG SPECIFICATIONS
FIRING ORDER
Scheme 1
Scheme 1: Firing Order (1.8L, 1.9L, 2.2L & 2.4L)
Scheme 2
Scheme 2: Firing Order (3.0L & 3.5L)
Scheme 3
Scheme 3: Firing Order (3.1L & 3.4L)
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)
IGNITION TIMING
Note. All models are equipped with an electronic computer-controlled ignition system. Timing is not adjustable.
FUEL PUMP
| Application | (1) KOEO psi (kPa) |
|---|
| 1.8L | 44-50 (303-345) |
| 1.9L | 40-55 (276-379) |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire |
| VIN "F" (2) | 50-60 (345-414) |
| VIN "4" (2) | 53-59 (365-407) |
| Saturn ("L" Series) | 50-60 (345-414) |
| "N" Body | 50-60 (345-414) |
| 2.4L | 53-59 (365-407) |
| 3.0L | 40-50 (276-345) |
| 3.1L & 3.4L | 52-59 (359-407) |
| 3.5L, 4.0L & 4.6L | 41-47 (283-324) |
| 3.8L |
| VIN "K" (2) | (3) 53-59 (365-407) |
| VIN "1" (2) | 48-54 (331-372) |
| 5.7L | 55-62 (379-428) |
| (1) KOEO is ignition key ON and engine OFF. (2) Eighth VIN character. (3) 48-55 psi (331-379 kPa) on Camaro and Firebird. |
| (1) | KOEO is ignition key ON and engine OFF. |
| (3) | 48-55 psi (331-379 kPa) on Camaro and Firebird. |
INJECTOR RESISTANCE
| Application | (1) Ohms |
|---|
| 1.8L | (2) 13.4-14.4 |
| 1.9L | (3) 11.8-12.6 |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | 11.0-14.0 |
| Saturn ("L" Series) | (3) 12.0-13.0 |
| "N" Body | 11.0-14.0 |
| 3.0L | 14.0-23.0 |
| 3.4L |
| Except Impala & Monte Carlo | 11.0-14.0 |
| Impala & Monte Carlo | 11.4-12.6 |
| All Others | 11.0-14.0 |
| (1) Unless otherwise specified, injector resistance specification is at 50-95°F (10-35°C). (2) Injector voltage is also measured. Voltage reading should be 6.7-7.7 volts. (3) Injector resistance specification is at 74°F (23.3°C). |
| (1) | Unless otherwise specified, injector resistance specification is at 50-95°F (10-35°C). |
| (2) | Injector voltage is also measured. Voltage reading should be 6.7-7.7 volts. |
| (3) | Injector resistance specification is at 74°F (23.3°C). |
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 |
|---|
| 1.8L | 0.1 To 4.9 |
| 1.9L | (2) |
| 2.2L |
| "J" Body |
| Cavalier & Sunfire | (3) |
| Saturn ("L" Series) | (4) |
| "N" Body | (3) |
| 3.0L | (5) |
| 3.8L | (6) |
| 5.7L |
| Camaro & Firebird | (3) |
| Corvette | (7) |
| 2.4L, 3.1L, 3.4L, 3.5L, 4.0L & 4.6L | (3) |
| (1) Voltage range is from idle to wide open throttle. (2) Voltage ranges from 0.2-0.6 volt with throttle closed to 4.7 volts at wide open throttle. (3) Voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. (4) Voltage ranges from 0.15-0.55 volt with throttle closed to 4.65 volts at wide open throttle. (5) Voltage ranges from 0.50 volt with throttle closed to 4.15-4.35 volts at wide open throttle. (6) On Camaro and Firebird, voltage range is from 0.25 volt with throttle closed to 4.49 volts at wide open throttle. On all other vehicles, voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. (7) TP sensor is 2 individual units within one housing. TP sensor 1 signal voltage ranges from one volt with throttle closed to more than 3.5 volts at wide open throttle. TP sensor 2 signal voltage ranges from about 3.8 volts with throttle closed to less than one volt at wide open throttle. |
| (1) | Voltage range is from idle to wide open throttle. |
| (2) | Voltage ranges from 0.2-0.6 volt with throttle closed to 4.7 volts at wide open throttle. |
| (3) | Voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. |
| (4) | Voltage ranges from 0.15-0.55 volt with throttle closed to 4.65 volts at wide open throttle. |
| (5) | Voltage ranges from 0.50 volt with throttle closed to 4.15-4.35 volts at wide open throttle. |
| (6) | On Camaro and Firebird, voltage range is from 0.25 volt with throttle closed to 4.49 volts at wide open throttle. On all other vehicles, voltage range is from less than one volt at closed throttle to greater than 4 volts at wide open throttle. |
| (7) | TP sensor is 2 individual units within one housing. TP sensor 1 signal voltage ranges from one volt with throttle closed to more than 3.5 volts at wide open throttle. TP sensor 2 signal voltage ranges from about 3.8 volts with throttle closed to less than one volt at wide open throttle. |
TP SENSOR ADJUSTMENT VOLTAGE
