Note: If lack of power, increased oil and/or fuel consumption is observed, measure the end compression pressure.
1. Check the end compression pressure in the cylinders.
a) Insert the compression tester into the spark plug hole.
b) Open the throttle valve fully.
c) While turning the engine with the starter, measure the compression pressure.
Note: Always use a fully charged battery to obtain engine speed of 250 rpm or more.
d) Repeat steps (a) through (c) for each cylinder.
Note: Measurements should be taken in as short a time as possible.
End compression pressure:
3S-FE, 4S-FE
- nominal - 12.5 kg/cm²
- minimum - 10.0 kg/cm²
The pressure difference between cylinders is no more than 1.0 kg/cm²
4A-FE, 7A-FE
- nominal - 13.5 kg/cm²
- minimum - 10.0 kg/cm²
The pressure difference between cylinders is no more than 1.0 kg/cm²
5A-FE
- nominal - 14.0 kg/cm²
- minimum - 10.0 kg/cm²
The pressure difference between cylinders is no more than 1.0 kg/cm²
d) If the end compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (a) through (c) for cylinders with low compression pressure.
- If adding oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
- If the pressure remains low, the valve may be sticking or not seating properly, or there may be a leak through the cylinder head gasket.