Compression Test
COMPRESSION CHECKHINT: If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1. Allow the engine to warm up to normal operating temperature, then STOP engine.
2. Disconnect distributor connectors.
3. Disconnect high-tension cords from spark plugs.
- Disconnect the high - tension cords at the rubber boot. Do not pull on the cords.
NOTE: Pulling on or bending the cords may damage the conductor inside.
4. Using a 16 mm plug wrench, remove the 4 spark plugs.
5. Check cylinder compression pressure
a. Insert a compression gauge into the spark plug hole.
b. Fully open the throttle.
c. While cranking the engine, measure the compression pressure.
d. Repeat steps (a) through (c) for each cylinder.
HINT: Always use a fully charged battery to obtain engine revolutions of 250 rpm or more.
NOTE: This measurement must be done in as short a time as possible.
Compression pressure: 1,226 kPa (178 psi) or more
Minimum pressure: 981 kPa (142 psi)
Difference between each cylinder: 98 kPa (14 psi) or less