Compass 2WD L4-2.0L VIN 0 (2007)
Compression Check: Testing and Inspection
CYLINDER COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test can be utilized to diagnose several engine malfunctions.
Ensure the battery is completely charged and the engine starter motor is in good operating condition. Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
1. Check engine oil level and add oil if necessary.
2. Drive the vehicle until engine reaches normal operating temperature. Select a route free from traffic and other forms of congestion, observe all
traffic laws, and accelerate through the gears several times briskly.
3. Remove engine cover.
4. Disconnect coil electrical connectors and remove coils.
5. Remove all spark plugs from engine. As spark plugs are being removed, check electrodes for abnormal firing indicators such as fouled, hot, oily,
etc. Record cylinder number of spark plug for future reference.
6. Disconnect injector electrical connectors.
7. Insert compression pressure adaptor 8116 or the equivalent, into the #1 spark plug hole in cylinder head. Connect the 0û500 psi (Blue) pressure
transducer CH7059 with cable adaptors to the DRBIII«. For Special Tool identification.
8. Crank engine until maximum pressure is reached on gauge. Record this pressure as #1 cylinder pressure.
9. Repeat the previous step for all remaining cylinders.
10. Compression should not be less than 689 kPa (100 psi) and not vary more than 25 percent from cylinder to cylinder.
11. If one or more cylinders have abnormally low compression pressures, repeat the compression test.
12. If the same cylinder or cylinders repeat an abnormally low reading on the second compression test, it could indicate the existence of a problem in
the cylinder in question. The recommended compression pressures are to be used only as a guide to diagnosing engine problems. An engine should
not be disassembled to determine the cause of low compression unless some malfunction is present.
