Diagnosis of Faults

Appearance of the cape:

Cable contamination due to oil leakage, cleaning products or products for detecting leakage current. The cable may have a damp appearance. (presence of oil) or dried out, causing loss of cable elasticity.

Problems:

Misfire;

Higher probability of flash over occurrence.

Causas:

1. 1. Engine oil leak;
2. 2. Use of solvents for engine cleaning;
3. 3. Use of Leakage Current Detection Products;

Solutions:

For Cause 1, fix engine oil leaks;

For Cause 2, avoid the use of solvents in engine washing;

For Cause 3, avoid using spray to detect leakage current;

for all causes, replace the cables with those specified in the NGK application table.

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Appearance of the cape:

Cut in protective cover or sealing sleeve.

Problems:

current leakage;

Misfire.

Cause:

Inappropriate tool use for cable removal, causing a cut in the rubber (incorrect handling).

Solutions:

Replace the cables with those specified in the NGK application table.

Avoid using sharp tools to remove cables.

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Appearance of the candle, cable and coil:

Sail: Dark vertical marks between terminal pin and metal castle, caused by the passage of electric current on the outside of the spark plug.

Cape: Vertical marks on the cable insulation rubber, caused by the passage of electric current.

Coil: Vertical marks on the coil insulation rubber or between the high voltage terminals, caused by the passage of electric current.

Problems:

Misfires, especially at higher engine torque rotations, which can generate overflows in the intake manifold in case of CNG use.

Consumption increase;

Increased levels of pollutant emissions;

Causes:

1. 1. Replacing only one component affected by flashover;
2. 2. Presence of contaminants between the surface of the spark plug and cable or spark plug and ignition coil;
3. 3. lean mixture;
4. 4. Excessive wear of spark plugs;
5. 5. Cable or coil with dry or inelastic rubber terminal;
6. 6. Compression ratio or turbo pressure too high;
7. 7. delayed ignition timing;
8. 8. Incorrect candle application, cables and coil;

Solutions:

For Cause 1, replace candles, cables and coil simultaneously;

For Cause 2, clean your hands, avoiding oil residue, greases and solvents in ignition components;

For Cause 3, check the correct operation of the injection system;

For causes 4 and 5, follow the maintenance plan specified by the engine manufacturer. If you do not have the maintenance plan, the recommendation is to inspect every 10.000km and change every 3 years or 60.000Whichever comes first;

For Cause 6, check compression ratio or turbo pressure, correcting if necessary;

For Cause 7, in CNG systems (gas) and programmable injection system, check the correct ignition timing;

For Cause 8, replace the candles, cables and ignition coil by those specified in the NGK application table.

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Appearance of the cape:

When replacing the ignition cable, which is apparently normal, motor fails with new cable. There may have been a hole in the spark plug terminal, due to misalignment with the spark plug at the time of installation.

Trouble:

Misfire.

Cause:

Misalignment between spark plug and cable at installation.

Solution:

Install the cable correctly, according to spark plug alignment.

Replace the cables with those specified in the NGK application table.

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Appearance of the cape:

Connection terminal with oxidation.

Trouble:

Misfire;

High contact resistance.

Causes:

1. 1. Bad connection between cable and spark plug or cable and coil, in this case there is formation of ozone that is highly oxidizing;
2. 2. Water or moisture infiltration;
3. 3. Chemical attack.

Solutions:

For Cause 1, make sure the cable is well connected to the spark plug and ignition coil;

For causes 2 and 3, avoid the application of solvents, chemicals and water in ignition cables.

for all causes, replace the cables with those specified in the NGK application table.

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Appearance of the cape:

Cables and their terminals are produced based on high performance polymers, but with constant heating they show dryness and loss of elasticity.

Problems:

Misfire;

Higher probability of flash over occurrence.

Causas:

1. 1. Lack of preventive maintenance;
2. 2. overheating;

Solutions:

For Cause 1, perform preventive maintenance as specified by the assembler or engine manufacturer. Substitua os cabos de ignição a cada 3 anos ou 60.000km;

For Cause 2, check the cooling system. In the case of cables that are positioned next to the exhaust manifold, check for obstruction or cracks in the exhaust manifold and lack of heat deflectors.

for all causes, replace the cables with those specified in the NGK application table.

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Appearance of the cape:

Release of the metallic cable connector, tear in the ignition cable protective cap.

Problems:

Installation difficulty;

High electrical resistance or discontinuity.

Causes:

1. 1. Cable inclination when uninstalling;
2. 2. Pull the cable by the wire when uninstalling.

Solutions:

For Cause 1, pull the cable in line with the spark plug,

For Cause 2, remove the cable through the terminal, turning the terminal to take off the sail;

for all causes, replace the cables with those specified in the NGK application table.

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