ENGINE COMPRESSION
To check engine compression, bring engine to normal operating temperature. Disconnect fuel injector connectors. Remove air intake hose from throttle body. Remove ignition coils and high-tension cord set assembly. On all models, remove all spark plugs. Fully open throttle. Ensure engine cranking speed is at least 250 RPM when measuring compression.
| Application | Specification |
|---|
| Compression Ratio | 10.5:1 |
| Compression Pressure |
| ES300 | 218 psi (15.3 kg/cm 2 ) |
| GS300 & SC300 | 195 psi (13.5 kg/cm 2 ) |
| GS400, LS400 & SC400 | 178 psi (12.5 kg/cm 2 ) |
| Minimum Compression Pressure |
| ES300 | 145 psi (10.1 kg/cm 2 ) |
| GS300 & SC300 | 156 psi (11.0 kg/cm 2 ) |
| GS400, LS400 & SC400 | 142 psi (10.0 kg/cm 2 ) |
| Maximum Variation Between Cylinders | 14 psi (1.0 kg/cm 2 ) |
COMPRESSION SPECIFICATIONS
VALVE CLEARANCE
| Application | (1) In. (mm) |
|---|
| Intake | .006-.010 (.15-.26) |
| Exhaust | .010-.014 (.26-.36) |
| (1) Check and adjust valves with engine cold. |
| (1) | Check and adjust valves with engine cold. |
VALVE CLEARANCE SPECIFICATIONS
IGNITION COIL
Note. Information for GS400, LS400 & SC400 is not available from manufacturer at time of publication.
| Application | Primary | Secondary |
|---|
| Aisan |
| Cold (1) | .70-.94 | 10,800-14,900 |
| Hot (2) | .85-1.10 | 13,100-17,500 |
| Diamond |
| Cold (1) | .70-.94 | 6,800-11,700 |
| Hot (2) | .85-1.10 | 8,600-13,700 |
| (1) Coil temperature of 14-122°F (-10-50°C). (2) Coil temperature of 123-212°F (51-100°C). |
| (1) | Coil temperature of 14-122°F (-10-50°C). |
| (2) | Coil temperature of 123-212°F (51-100°C). |
| Application | Primary | Secondary |
|---|
| Cold (1) | .33-.52 | 8,500-14,700 |
| Hot (2) | .42-.61 | 10,800-17,200 |
| (1) Coil temperature of 14-122°F (-10-50°C). (2) Coil temperature of 123-212°F (51-100°C). |
| (1) | Coil temperature of 14-122°F (-10-50°C). |
| (2) | Coil temperature of 123-212°F (51-100°C). |
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| All Models | 25,000 Maximum |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Plug No. |
|---|
| NGK | BKR6EKPB-11 |
| Denso | PK20TR-11 |
| Application | Plug No. |
|---|
| NGK | BKR5EKPB-11 |
| Denso | PK16R-11 |
| Application | Plug No. |
|---|
| NGK | IFR6A-11 |
| ND | SK20R-11 |
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| New Plug | .043 (1.10) | 13 (17) |
| Maximum Wear (1) | .051 (1.30) | 13 (17) |
| (1) Replace spark plug if gap exceeds specification. |
| (1) | Replace spark plug if gap exceeds specification. |
SPARK PLUG SPECIFICATIONS
| Application | Gap In. (mm) | Torque Ft. Lbs. (N.m) |
|---|
| New Plug | .043 (1.10) | 13 (17) |
| Maximum Wear (1) | .047 (1.20) | 13 (17) |
| (1) Replace spark plug if gap exceeds specification. |
| (1) | Replace spark plug if gap exceeds specification. |
SPARK PLUG SPECIFICATIONS
FIRING ORDER & CYLINDER NUMBERING
| Application | Firing Order |
|---|
| ES300 | 1-2-3-4-5-6 |
| GS300 & SC300 | (1) |
| GS400, LS400 & SC400 | 1-8-4-3-6-5-7-2 |
| (1) Information is not available from manufacturer at time of publication. |
| (1) | Information is not available from manufacturer at time of publication. |
| Application | (1) Cylinder Number |
|---|
| ES300 |
| Right Bank (2) | 1-3-5 |
| Left Bank (2) | 2-4-6 |
| GS300 & SC300 | (3) |
| GS400, LS400 & SC400 |
| Left Bank (2) | 1-3-5-7 |
| Right Bank (2) | 2-4-6-8 |
| (1) Starting at cylinder closest to timing belt-end of engine. (2) As viewed from flywheel-end of engine. (3) Cylinder No. 1 is located at timing belt end of engine. Cylinder No. 6 is located at flywheel end of engine. |
| (1) | Starting at cylinder closest to timing belt-end of engine. |
| (2) | As viewed from flywheel-end of engine. |
| (3) | Cylinder No. 1 is located at timing belt end of engine. Cylinder No. 6 is located at flywheel end of engine. |
IGNITION TIMING
| Application | (1) Base Timing | (2) Controlled Timing |
|---|
| ES300 | 8-12 @ 650-750 | 7-24 @ 650-750 |
| GS300 & SC300 | 8-12 @ 650-750 | 6-16 @ 650-750 |
| GS400, LS400 & SC400 | 8-12 @ 650-750 | (3) |
| (1) Jumper wire connected between terminals of DLC No. 1. (2) Jumper wire disconnected from DLC No. 1. (3) Information is not available from manufacturer at time of publication. |
| (1) | Jumper wire connected between terminals of DLC No. 1. |
| (2) | Jumper wire disconnected from DLC No. 1. |
| (3) | Information is not available from manufacturer at time of publication. |
FUEL SYSTEM
| Application | Psi (kg/cm 2 ) |
|---|
| All Models | 44-50 (3.1-3.5) |
| Application | Ohms |
|---|
| All Models | .2-3.0 |
FUEL PUMP RESISTANCE SPECIFICATIONS
INJECTOR RESISTANCE
| Application | Ohms |
|---|
| All Models | 13.4-14.2 |
INJECTOR RESISTANCE SPECIFICATIONS
THROTTLE OPENER
| Application | (1) RPM |
|---|
| ES300 | 900-1950 |
| All Other Models | (2) |
| (1) Disconnect and plug throttle opener vacuum hose. Specification is with engine at idle and at normal operating temperature. (2) Information is not available from manufacturer at time of publication. |
| (1) | Disconnect and plug throttle opener vacuum hose. Specification is with engine at idle and at normal operating temperature. |
| (2) | Information is not available from manufacturer at time of publication. |
THROTTLE OPENER SET SPEED SPECIFICATIONS
THROTTLE POSITION (TP) SENSOR
| Application & Throttle Plate Position | TP Sensor Terminals | Resistance Ohms @ 68°F (20°C) |
|---|
| ES300 (1) (2) |
| Throttle Fully Closed | VTA & E2 | 200-6300 |
| Throttle Fully Open | VTA & E2 | 2000-10,200 |
| All Positions | VC & E2 | 2500-5900 |
| GS300 & SC300 | VC & E2 | 1200-3200 |
| GS400, LS400 & SC400 | VC & E2 | 1250-2350 |
| (1) Disconnect vacuum hose from throttle opener. Apply vacuum to throttle opener to allow throttle to fully seat. (2) For terminal identification, see THROTTLE POSITION (TP) SENSOR in ADJUSTMENTS article. |
| (1) | Disconnect vacuum hose from throttle opener. Apply vacuum to throttle opener to allow throttle to fully seat. |
| (2) | For terminal identification, see THROTTLE POSITION (TP) SENSOR in ADJUSTMENTS article. |
THROTTLE POSITION (TP) SENSOR RESISTANCE
