Mechanical Inspection: Compression
Check engine mechanical condition with a compression gauge, vacuum gauge, or an engine analyzer. If compression gauge is used, see COMPRESSION SPECIFICATIONS
table. Ensure engine cranking speed is about 300 RPM. If vacuum gauge is used, check for low or unstable vacuum condition. If engine analyzer is used, see manufacturer's manual for specific instructions.
COMPRESSION SPECIFICATIONS
| Application |
Specification |
| Compression Pressure |
| 2.2L |
|
| 3.2L |
199 psi (1373 kPa) |
| 3.5L |
199 psi (1373 kPa) |
| 4.2L |
199 psi (1373 kPa) |
| 5.3L |
|
| Compression Pressure (Minimum) |
| 2.2L |
|
| 3.2L |
|
| 3.5L |
|
| 4.2L |
139.3 psi (700 kPa) |
| 5.3L |
100 psi (690 kPa) |
| Compression Ratio |
| 2.2L |
10.0:1 |
| 3.2L & 3.5L |
9.1:1 |
| 4.2L |
9.1:1 |
| 5.3L |
9.45:1 |