Removal and installation
1. Disconnect the high voltage wire from the spark plug.
- A) Turn the tip of the spark plug wire half a turn.
- b) Pull the tip to disconnect the wire.
2. Clean the area around the spark plug. If necessary, blow with compressed air.
3. Remove the spark plug. When removing several candles, mark their installation locations.
Torque:
- new spark plugs 20 N.m
- used 15 N.m
4. Installation is made in sequence, return to removal.
Examination
Note: The car manufacturer recommends replacing spark plugs with platinum or iridium electrodes every 100,000 km of the car's run, conventional spark plugs - every 45,000 km. However, taking into account the quality of gasoline in the CIS countries, it is recommended to replace the spark plugs after their actual failure.
Attention: For spark plugs with platinum or iridium electrodes:
- Replace the spark plug if the clearance limit is exceeded.
- Do not attempt to adjust the gap on these spark plugs.
- Cleaning these spark plugs can damage the electrode coating. Therefore, use a spark plug cleaner to remove carbon deposits and completely clean the spark plug within 20 seconds or less to avoid damaging the electrode coating. Do not use a wire brush.
1. Inspect the output (1) spark plug wire and check for damage. Check the tightness of the terminal (it shouldn't rotate).
Examine the insulator (2), check for cracks or soot deposits. Cracks or soot leads to breakdown between the terminal (1) and mass instead of breakdown between the electrodes (3) And (4).
Shake the candle: a rattling sound indicates internal damage to the candle (loose fit of the center electrode (4) reduces the power of the spark discharge).
Inspect the area of the spark plug protruding from the cylinder head. Dirty or damaged threads indicate incorrect spark plug installation.
During normal operation of the candle, the color of the insulator changes from gray-yellow to brown with small inclusions of a powdery substance (combustion products of additives in fuel and oil).
Dry and fluffy carbon deposits can be caused by:
- A) Rich air-fuel mixture:
- leaking nozzles;
- excessive fuel pressure;
- dirty air filter;
- improper combustion.
- b) Low output voltage:
- defective ignition coil;
- defective spark plug wires;
- incorrect gap between the electrodes of the spark plug.
- V) Continuous idling or low speed operation.
2. Make sure the correct spark plugs are installed. The use of an incorrect type of spark plug will cause deterioration in engine performance.
3. Measure the gap between the center electrode and ground electrode. An excessively large gap can cause the spark plug to run irregularly.
Recommended spark plugs:
- Models up to 2007 release:
- NGK - part number 12567759
- AS - part number 25171803
- ACDelco - part number 41-974
- Nominal clearance - 1.5 mm
- Models from 2007 release:
- GM - part number 12571164
- ACDelco - part number 41-985
- Nominal clearance - 1.0 mm