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 «Back to Brisk Technical Info

SPARK PLUG DIAGNOSIS

Diagnostic of failure

Failure

Cause

Consequences

Fig.

Improperly adjusted ignition system

Spark advance (from a proper moment)

Pre - ignitions Detonation burning

2

 

Spark delay (from a proper moment)

Excessive formation of combustion deposits

1

Improper air/fuel ratio

Rich mixture

Excessive formation of combustion deposits

1

 

Lean mixture

Pre - ignitions Detonation burning

2

Low or no performance of the air filter

Dust penetration into the combustion area

Excessive deposits

3

 

Filter impassability

Excessive formation of combustion deposits

1

Compression pressure

Low

Excessive formation of combustion deposits

1

Improperly selected spark plug

Too hot

Pre - ignitions Detonation burning

2

 

Too cold

Excessive formation of combustion deposits

1

None

 

Perfect performance of the spark plug

4


 

MAINTENANCE

Spark plugs do not require any maintenance during the replacement interval. Certain level of maintenance is, however, required by the vehicle whose part the spark plugs are. All deficiencies caused by insufficient vehicle maintenance can be reflected on the spark plug. That is why we recommend, within the framework of prevention, to check the spark plugs at least once a year. Their appearance reflects technical conditions of your vehicle.

Spark plugs replacement intervals are specified for a maximum mileage performance of the engine in a good technical condition. Therefore never exceed the replacement intervals prescribed for a given type of spark plugs! Possible spark plug replacement before the interval prescribed will not cause any problem.