Check Compression


If there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.

a. Warm up and stop engine.

1. Allow the engine to warm up to normal operating temperature.

b. Remove spark plugs (See ON-VEHICLE INSPECTION ).

c. Check cylinder compression pressure.

1. Insert a compression gauge into the spark plug hole.

2. Fully open the throttle.

3. While cranking the engine, measure the compression pressure. HINT:

Always use a fully charged battery to obtain engine speed of 250 rpm or more.

2006 ENGINE Engine Mechanical - Sequoia

4. Repeat steps (a) through (c) for each cylinder.

4. Repeat steps (a) through (c) for each cylinder.

Fig. 7: Checking Cylinder Compression Pressure Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.


Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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