2. Disconnect high voltage wires from spark plugs.
3. Remove all spark plugs.
4. Disconnect the 7-pin connector from the ignition distributor.
Note. Disconnecting the connector from the ignition distributor will disable the ignition system and the fuel injection system.
5. When turning the crankshaft with a starter, cover all spark plug holes with a towel or cloth. After cranking the crankshaft with the starter, check for impurities adhering to the towel.
Warnings
Do not stand in front of the spark plug holes when checking compression.
If during the measurement of compression in the cylinder (as a result of cracks) If coolant, oil, fuel, etc. gets in, these substances will heat up and be ejected under pressure from the spark plug hole, which can be dangerous.
6. Connect a compression gauge to the spark plug hole of cylinder #1 (pic. 3.11).
Pic. 3.11. Connecting a compression gauge to the spark plug hole
7. Open the throttle, turn the engine crankshaft with a starter and write down the result.
Rated compression at crankshaft speed 250-400 min1: 1598 kPa
The minimum allowable compression at a crankshaft speed of 250-400 min1: 1161 kPa
8. Check up a compression in other cylinders and write down the received indications. The pressure in all cylinders must be the same or differ no more than the permissible value.
Permissible compression difference in the engine cylinders: 100 kPa.
9. If any cylinder pressure is too low, pour a teaspoon of clean engine oil into the cylinder through the spark plug hole and repeat steps 7 and 8.
- (1) If the pressure increases after adding oil, the piston rings and/or cylinder are worn.
- (2) If the pressure does not increase, then the cause is worn or burned valves or a blown cylinder head gasket. Low pressure in two adjacent cylinders almost always means that a head gasket is blown between them.
10. Connect a socket to the distributor of ignition.
11. Screw in the spark plugs and connect the high voltage wires.
12. Use the MUT-II to clear diagnostic trouble codes.
Note. The DTC will be cleared as a result of disconnecting the connector from the crankshaft position sensor.