If the cylinder pressure is too low, it could be due to a number of factors, including:
- Worn piston rings
- Leaking valves
- Head gasket failure
If the cylinder pressure is too high, it could be due to:
- Carbon buildup
- Incorrect ignition timing
- Overheated engine
If you're experiencing problems with your Toyota Cressida, it's important to have the cylinder pressure checked to rule out any potential issues.