What is the quick diagnosis and elimination method of engine spark plug fault?

Engine Spark plug fault diagnosis

The fault performance

(1) Engine weakness

(2) single cylinder or a few cylinders do not work

(3) High engine temperature

(4) The exhaust pipe has an obvious "protruding, protruding" sound

(5) Difficult to start or even unable to start

(6) Multiple Spark Plug failures will lead to startup difficulties or even failure

The cause of the problem

(1) The spark plug gap is too large. For ordinary spark plugs, the wear and tear of the central electrode will increase by 0.1-0.15mm for every 10000km of the vehicle.

(2) Spark plug tear short circuit

(3) The spark plug gap is too small

(4) Spark plug charcoal short circuit

(5) Spark plug oil short circuit

(6) The external insulator is broken

Diagnosis and exclusion

Using the method of cylinder breaking to detect which cylinder does not work or work poorly, you can remove the cylinder spark plug inspection. According to the spark plug phenomenon, analyze the cause of the fault, troubleshoot the fault, and then replace the spark plug.

(1) If spark plug oil, can be dried spark plug continue to use

(2)If the electrode melts, a cooler spark plug should be replaced

(3)If the spark plug scale, can be replaced with a hotter spark plug

Fault diagnosis of spark plug gap too large or too small

Spark plug clearance is too large fault performance:

① Lack of engine fire.

② High speed poor ignition, power drop.

③ Discharge pipe blasting.

④ The Ignition coil is broken down.

Spark plug clearance is too small fault performance:

① Engine idle is unstable

② Poor acceleration of the engine

③ Exhaust emissions exceed the standard

④ The spark plug electrode is ablated prematurely

Cause of failure:

(1) The spark plug gap is too large

① The spark plug has not been replaced for a long time, and the ordinary spark plug should be replaced in the vehicle running 30,000 km.

(2) The spark plug gap is too small

① The spark plug itself does not meet the requirements

② When installing spark plug, do not pay attention to the spark plug electrode deformation

Diagnosis and Exclusion:

Remove the spark plug and check the spark plug. If it does not meet the requirements, replace it with 1D brand spark plug.