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 SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 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. Reinstall ignition coils. Install and tighten spark plugs to 13 ft. lbs. (18 N.m).
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Normal Compression Pressure | |||
| V6 Models | |||
| Avalon, Camry, Camry Solara & Sienna | 218 psi (15.3 kg/cm2 ) | ||
| Tacoma, Tundra & 4Runner | 174 psi (12.2 kg/cm2 ) | ||
| V8 Models | |||
| Land Cruiser & Tundra | 192 psi (13.5 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| V6 Models | |||
| All Models | 145 psi (10.1 kg/cm2 ) | ||
| V8 Models | |||
| Land Cruiser & Tundra | 142 psi (10.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| V6 Models | |||
| All Models | 15 psi (1.1 kg/cm2 ) | ||
| V8 Models | |||
| Land Cruiser & Tundra | 14 psi (1.0 kg/cm2 ) | ||