Hyundai Elantra (CN7): Ignition System / Spark Plug
Description and operation
A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture therein by means of an electric spark, while containing combustion pressure within the engine. A spark plug has a metal threaded shell, electrically isolated from a central electrode by a porcelain insulator.
Specifications
Item
|
Specification
|
Type
| SILZKR8J8GS
|
Gap
| 0.7 - 0.8 mm
(0.0275 - 0.0314 in.)
|
Repair procedures
| 1. | Accelerate the engine to about 3,000rpm 3 times or more. |
| 3. | Check the spark plug visually. If the electrode is dry, the spark plug is normal. If the electrode is wet, check the damage and electrode gap as below. |
| 1. | Check the spark plug for any damage on its thread and insulator. If there is damage, replace the spark plug. |
| 2. | Check the electrode. Measure the insulation resistance with an ohmmeter. If the resistance is less than the specified value, adjust the electrode gap. Specification : 10 MΩ or more |
|
| 3. | Check the spark plug electrode gap. If the gap is greater than the maximum, replace the spark plug. Specification : Refer to "Specifications" |
| •
| If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug. |
|
|
The combustion temporarily becomes unstable, due to the aged fuel and the carbon deposits accumulated on the spark plug(s) after long-term storage.
| 1. | Start the engine and keep the engine running at idle for 2 minutes. |
| 2. | Step on the accelerator pedal and hold it steady at 4500 rpm with the shift lever in N position to warm up the engine until the temperature of the engine coolant reaches 80°C. |
| 3. | Keep the engine running at 2500-3000rpm in the N position for 15 minutes. 
|
| •
| The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur). |
|
| 1. | Start the engine and keep the engine running at idle for 2 minutes. |
| 2. | Drive the vehicle for over 20 minutes, keeping the engine speed above 3500rpm. | •
| If equipped with manual transaxle, shift the gear properly for keeping the engine speed above 3500 rpm. |
|
|
| 1. | Remove the ignition coil. (Refer to Ignition System - "Ignition Coil") |
| 2. | Using a spark plug wrench, remove the spark plug (A). Tightening torque : 14.7 - 24.5 N.m (1.5 - 2.5 kgf.m, 10.9 - 18.0 Ib-ft) |
| •
| Be careful that no contaminates enter into spark plug holes. |
|
|
| 1. | Install in the reverse order of removal. |
Description and operation
DescriptionAn ignition coil is an induction coil in an engine's ignition system which transforms the battery's low voltage to the high voltage needed to create an electric spark in the spark plugs to ignite the fuel.
Other information:
General Safety Information and Caution1.Be careful when driving the vehicle using the smart cruise control system as follows.(1)On curves or inclines/declines•
The smart cruise control system may have limits to detect distance to the vehicle ahead due to road and traffic conditions.
Trouble Symptom ChartsTrouble Symptom 1Trouble Symptom 2
Trouble symptom
Probable cause
Remedy
The set vehicle speed varies greatly upward or downward"Surging" (repeated alternating acceleration and deceleration) occurs after settingMalfunction of the vehicle speed se
