Compression test
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'''Disable spark and fuel''' | '''Disable spark and fuel''' | ||
| − | + | On a vehicle with a electric fuel pump pull the fuel pump relay, let engine idle until it stalls out. For mechanical fuel pump, I think using a vise grip and 2 thin blocks of wood (to avoid crimping the soft line) on the rubber fuel line will work. This prevents fire hazard. | |
Remove the coil wire, or ECM fuse or wiring harness clip off the coil for computerized engines,- by allowing the coils to be energized you could get a serious jolt! | Remove the coil wire, or ECM fuse or wiring harness clip off the coil for computerized engines,- by allowing the coils to be energized you could get a serious jolt! | ||
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'''Hook up compression tester''' | '''Hook up compression tester''' | ||
| − | The fitting threads into the spark plug hole, and many models also have a vacuum gauge function as well. | + | The compression tester fitting threads into the spark plug hole, and many models also have a vacuum gauge function as well. |
Crank the engine over for 10 seconds, and record maximum pressure reading. Record your findings. | Crank the engine over for 10 seconds, and record maximum pressure reading. Record your findings. | ||
Move onto the next cylinder, repeat the compression test, and when you're done they should not be more than 10% off from each other, and none should be really low (0). If they are, you have some problems. | Move onto the next cylinder, repeat the compression test, and when you're done they should not be more than 10% off from each other, and none should be really low (0). If they are, you have some problems. | ||
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