Mechanical Inspection: Compression
Warm engine to normal operating temperature before checking the compression. Ensure battery is fully charged. Remove ignition coils and spark plugs. See IGNITION SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Check engine mechanical condition with a compression gauge, vacuum gauge, or engine analyzer with throttle fully open. See engine analyzer manual for specific instructions. See COMPRESSION SPECIFICATIONS table. Install and tighten spark plugs to 13 ft. lbs. (18 N.m).
COMPRESSION SPECIFICATIONS
| Application | psi (kg/cm2 ) | |
|---|---|---|
| Normal Compression Pressure | ||
| ES300 | 218 (15.3) | |
| GS300 & SC300 | 192 (13.5) | |
| GS400, LS400 & SC400 | 178 (12.5) | |
| LX470 | 192 (13.5) | |
| RX300 | 218 (15.3) | |
| Minimum Compression Pressure | ||
| ES300 | 145 (10.1) | |
| GS300 & SC300 | 156 (11.0) | |
| GS400, LS400, LX470 & SC400 | 142 (10.0) | |
| RX300 | 145 (10.1) | |
| Maximum Variation Between Cylinders | ||
| All Models | 14 (1.0) | |