Compression Check: Testing and Inspection

INSPECT COMPRESSION
(a) Warm up and stop the engine.
(b) Remove the 2 bolts, 2 screws and No. 1 engine under cover.
(c) Drain engine coolant.
(d) Remove the front wiper motor and link.
(e) Remove the front cowl top outer panel.





(f) Remove the 2 nuts and V-bank cover.
(g) Loosen the clamp and remove the No. 2 air cleaner hose.





(h) Disconnect the ventilation hose.





(i) Disconnect the MAF connector.
(j) Using a clip remover, detach the 2 wire harness clamps.
(k) Disconnect the vacuum hose.





(l) Loosen the hose clamp and remove the 2 bolts and air cleaner with element.
(m) Remove the intake air surge tank.
(n) Remove the 6 ignition coils.
(o) Remove the 6 spark plugs.
(p) Disconnect the 6 fuel injector connectors.





(q) Inspect the cylinder compression pressure.
(1) Insert a compression gauge into the spark plug hole (Procedure "A").
SST 09992-00500
(2) While cranking the engine, measure the compression pressure (Procedure "B").
Compression pressure: 1300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure: 1000 kPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi)

HINT:
^ Use a fully-charged battery so that the engine speed can be increased to 250 rpm or more.
^ Measure the compression in as short a time as possible.

(3) Repeat procedures "A" and "B" for each cylinder.
(4) If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat procedures "A" and "B" for cylinders with low compression.
^ If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
^ If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage from the gasket.
(r) Connect the 6 injector connectors.
(s) Install the 6 spark plugs.
Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)
(t) Install the 6 ignition coils.
Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf)
(u) Install the intake air surge tank.
(v) Install the air cleaner with element.
(w) Install the No. 2 air cleaner hose.





(x) Install the V-bank cover with the 2 nuts.
Torque: 7.5 N*m (76 kgf*cm, 66 in.*lbf)
(y) Install the front cowl top outer panel.
(z) Install the wiper motor and link.
(aa) Add engine coolant.
(ab) Install the No. 1 engine under cover with the 2 bolts and 2 screws.
Torque:
for bolt 29 N*m (296 kgf*cm, 21 ft.*lbf)
for screw 5.4 N*m (55 kgf*cm, 48 in.*lbf)