Toyota Celica 2005 Repair Manual page 1389

Compression Gauge
2005 CELICA (RM1131U)
ENGINE MECHANICAL −
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE IGNITION COIL (See page IG−6)
3. REMOVE SPARK PLUGS
4. INSPECT 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.
HINT:
Always use a fully charged battery to obtain engine speed of
250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
A01037
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
1ZZ−FE 1,500 kPa (15.3 kgf/cm
2ZZ−GE 1,400 kPa (14.3 kgf/cm
Minimum pressure:
1ZZ−FE 1,000 kPa (10.2 kgf/cm
2ZZ−GE 1,000 kPa (10.2 kgf/cm
Difference between each cylinder:
1ZZ−FE 100 kPa (1.0 kgf/cm
2ZZ−GE 110 kPa (1.1 kgf/cm
(e) If the cylinder compression in one more cylinders 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.
S
S
5. REINSTALL SPARK PLUGS
6. INSTALL IGNITION COIL (See page IG−7)
1388
COMPRESSION
If adding oil helps 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 is improper, or there may be leakage past
the gasket.
EM−3
2
, 218 psi)
2
, 203 psi) or more
2
, 145 psi)
2
, 145 psi)
2
, 15 psi) or less
2
, 16 psi) or less
EM05K−18