| TIBURON(GK) >2008 > G 2.7 DOHC > Engine Mechanical System > General Information>Repair procedures |

INSPECTION
COMPRESSION PRESSURE
If the 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 coils. (Refer to Ignition system in EE Group).
3. | Remove spark plugs. Using a 16mm plug wrench, remove the 6 spark plugs.
4. | Check cylinder compression pressure
(1) | Insert a compression gauge into the spark plug hole.
(2) | While cranking the engine, measure the compression pressure.
Always use a fully charged battery to obtain engine speed of 250 rpm or more.
(3) | Repeat steps (a) through (b) for each cylinder.
This measurement must be done in as short a time as possible.
Compression pressure : 1,420kPa (14.5kgf/cm², 206psi) Minimum pressure : 1,270kPa (13kgf/cm², 184psi) Difference between each cylinder : 100kPa (1.0kgf/cm², 15psi) or less
(4) | If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (a) through (b) for cylinders with low compression.
A. | If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
B. | If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
5. | Reinstall spark plugs. (Refer to Ignition system in EE Group).
6. | Install ignition coils. (Refer to Ignition system in EE Group).