Compression (4Runner 4.7L V8)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature before checking compression. Stop engine. Ensure battery is fully charged.
- Remove throttle body cover sub-assembly and air cleaner hose assembly. Disconnect throttle control motor connector.
- Remove ignition coils. See IGNITION COIL under IGNITION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8 article. Remove spark plugs. Disconnect injector connectors.
- Fully open throttle and using compression gauge, check compression while cranking engine. Read compression in a short a time as possible. Ensure compression is within specification. See COMPRESSION SPECIFICATIONS table.
- If cylinder compression is low, pour a small amount of engine oil into cylinder through spark plug hole and inspect again. If adding oil increases compression, it is likely that piston rings and/or cylinder bore are worn or damaged. If pressure stays low, a valve may be sticking or seating improperly, or there may be leakage past head gasket.
- Connect injector connectors. Install and tighten spark plugs to 13 ft. lbs. (18 N.m). Reinstall and tighten ignition coils to 66 INCH lbs. (7.5 N.m). Connect throttle control motor connector. Install air cleaner hose assembly and throttle body cover sub-assembly.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Normal Compression Pressure | |||
| V6 Models | |||
| 4Runner | 189 psi (13.3 kg/cm2 ) | ||
| Avalon | 218 psi (15.3 kg/cm2 ) | ||
| Camry | 213 psi (15.0 kg/cm2 ) | ||
| Camry Solara | 218 psi (15.3 kg/cm2 ) | ||
| Highlander | 213 psi (15.0 kg/cm2 ) | ||
| Sienna | 218 psi (15.3 kg/cm2 ) | ||
| Tacoma & Tundra | 174 psi (12.2 kg/cm2 ) | ||
| V8 Models | |||
| 4Runner | 178 psi (12.5 kg/cm2 ) | ||
| Land Cruiser, Sequoia & Tundra | 192 psi (13.5 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| V6 Models | |||
| Avalon | 145 psi (10.1 kg/cm2 ) | ||
| Camry | 142 psi (10.0 kg/cm2 ) | ||
| 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 | |||
| 4Runner, Land Cruiser, Sequoia & Tundra | 142 psi (10.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| All Models | 14 psi (1.0 kg/cm2 ) | ||