- Engine 4A-F/FE 13.5 Bar
- Engine 3S-FE 13.0 Bar.
The wear limit for all engines is 10.0 bar. If the compression is below this value, you must decide whether to replace or repair the engine. It is also important whether one or all cylinders have insufficient compression. If, for example, the difference between individual cylinders is 1.0 atm, it may be that "bad" the valves are stuck in the cylinder and only the cylinder head needs to be repaired, that is, the valves need to be repaired. It is also possible that the piston rings are stuck, causing pressure to bleed along the piston into the crank mechanism. With a uniform loss of compression, in most cases, cylinder wear can be judged. To check compression, warm up the engine to operating temperature and remove the spark plugs. Disconnect the middle wire from the ignition coil. On an injection engine, also disconnect the connectors from the cold engine start injector and from the injectors. Connect the compression tester in accordance with the manufacturer's operating instructions. The assistant should get into the car and turn on the starter for about 5 seconds, while pressing the gas pedal all the way. Check the compression in all cylinders sequentially and compare with the specified value. If the compression is low in one cylinder, you can, as a first aid, to temporarily restore compression, pour the appropriate preparation available in the sale of related products into the spark plug hole. Information about these substances can be obtained from auto parts dealers.