Compression (Tacoma)
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature before checking the compression. Shut engine off. Remove intake air connector for access to spark plugs.
- Disconnect the vacuum hose from the fuel pressure regulator. Disconnect the wire clamp from engine wire.
- Loosen the hose clamp and remove the 2 bolts and intake air connector.
- Disconnect electrical connectors at ignition coils. Remove ignition coils and spark plugs.
- Check compression pressure by inserting a compression gauge into the spark plug hole. Fully open the throttle. Read compression in a short a time as possible. Ensure compression is within specification. See COMPRESSION SPECIFICATIONS table.
- If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect again. If adding oil increases the compression, it is likely that the 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 the gasket.
- Install and tighten spark plugs to 19 ft. lbs. (14 N.m) and ignition coil retaining bolts to 66 INCH lbs. (7.5 N.m). Install the intake air connector bolts to 13 ft. lbs (18 N.m)
COMPRESSION SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Normal Compression Pressure | |||
| Camry (Except Partial Zero Emission Vehicle) & Camry Solara | 198 psi (13.9 kg/cm2 ) | ||
| Camry (Partial Zero Emission Vehicle) | 189 psi (13.3 kg/cm2 ) | ||
| Celica | |||
| 1.8L (1ZZ-FE) | 218 psi (15.3 kg/cm2 ) | ||
| 1.8L (2ZZ-GE) | 203 psi (14.3 kg/cm2 ) | ||
| Corolla & Matrix | 189 psi (13.3 kg/cm2 ) | ||
| ECHO | 213 psi (15.0 kg/cm2 ) | ||
| Highlander | 198 psi (13.9 kg/cm2 ) | ||
| MR2 | 184 psi (13.0 kg/cm2 ) | ||
| Prius | 106 psi (7.4 kg/cm2 ) | ||
| RAV4 | 184 psi (13.0 kg/cm2 ) | ||
| Tacoma | 178 psi (12.5 kg/cm2 ) | ||
| Minimum Compression Pressure | |||
| Camry (Except Partial Zero Emission Vehicle) & Camry Solara | 142 psi (10.0 kg/cm2 ) | ||
| Camry (Partial Zero Emission Vehicle) | 145 psi (10.2 kg/cm2 ) | ||
| Celica | |||
| 1.8L (1ZZ-FE) & 1.8L (2ZZ-GE) | 145 psi (10.2 kg/cm2 ) | ||
| Corolla & Matrix | 145 psi (10.2 kg/cm2 ) | ||
| ECHO | 156 psi (11.0 kg/cm2 ) | ||
| Highlander | 142 psi (10.0 kg/cm2 ) | ||
| MR2 | 145 psi (10.2 kg/cm2 ) | ||
| Prius | 77 psi (5.4 kg/cm2 ) | ||
| RAV4 | 145 psi (10.2 kg/cm2 ) | ||
| Tacoma | 128 psi (9.0 kg/cm2 ) | ||
| Maximum Variation Between Cylinders | |||
| Camry (Except Partial Zero Emission Vehicle) & Camry Solara | 14 psi (1.0 kg/cm2 ) | ||
| Camry (Partial Zero Emission Vehicle) | 4.3 psi (0.3 kg/cm2 ) | ||
| Celica | |||
| 1.8L (1ZZ-FE) | 14 psi (1.0 kg/cm2 ) | ||
| 1.8L (2ZZ-GE) | 16 psi (1.1 kg/cm2 ) | ||
| Corolla, ECHO, Highlander, MR2, Matrix, Prius, RAV4 & Tacoma | 14 psi (1.0 kg/cm2 ) | ||