Mechanical Inspection: Compression
Warm engine to normal operating temperature before checking the compression. Ensure battery is fully charged. Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Remove spark plugs. On Highlander, manufacturer states to disconnect electrical connectors at fuel injectors. On all models, 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). Reinstall ignition coils.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Normal Compression Pressure | |||
| V6 Models | |||
| Avalon, Camry & Camry Solara | 218 psi (15.3 kg/cm2 ) | ||
| Highlander | 213 psi (15.0 kg/cm2 ) | ||
| Sienna | 218 psi (15.3 kg/cm2 ) | ||
| Tacoma, Tundra & 4Runner | 174 psi (12.2 kg/cm2 ) | ||
| V8 Models | |||
| Land Cruiser, Sequoia & Tundra | 192 psi (13.5 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| V6 Models | |||
| Avalon, Camry & Camry Solara | 145 psi (10.1 kg/cm2 ) | ||
| Highlander | 142 psi (10.0 kg/cm2 ) | ||
| Sienna, Tacoma, Tundra & 4Runner | 145 psi (10.1 kg/cm2 ) | ||
| V8 Models | |||
| Land Cruiser, Sequoia & Tundra | 142 psi (10.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| All Models | 14 psi (1.0 kg/cm2 ) | ||