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A spark plug (sometimes, in British English, a sparking plug, and, colloquially, a 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 by 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 ceramic insulator. The central electrode, which may contain a resistor, is connected by a heavily insulated wire to the output terminal of an ignition coil or magneto. The spark plug's metal shell is screwed into the engine's cylinder head and thus electrically grounded. The central electrode protrudes through the porcelain insulator into the combustion chamber, forming one or more spark gaps between the inner end of the central electrode and usually one or more protuberances or structures attached to the inner end of the threaded shell and designated the side, earth, or ground electrode(s).
Spark plugs may also be used for other purposes; in Saab Direct Ignition when they are not firing, spark plugs are used to measure ionization in the cylinders – this ionic current measurement is used to replace the ordinary cam phase sensor, knock sensor and misfire measurement function. Spark plugs may also be used in other applications such as furnaces wherein a combustible fuel/air mixture must be ignited. In this case, they are sometimes referred to as flame igniters.

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  1. T

    Spark coming from water line

    The main water line, which is metal, has a spark/light coming from it that is hot to the touch. This was noticed when we turned on our dryer and other items as well. It would light/heat and then stay on for a short period of time. Obviously we find this very dangerous. Does anyone know what does...
  2. K

    Ferroli Domicondens spark electrode fault

    Does anyone have any experience with resolving an A02 fault? "Flame present signal with burner off." Possible cause: electrode or card fault. It usually starts with an error code regarding no flame after ignition phase and is replaced by A02. I had a gas valve fault being displayed but got rid...
  3. U

    Halstead spark lead replacement

    Halstead hero 60 boiler works fine but spark lead is a bit tatty and all spares sites show it as obsolete, if it burns out what grade of cable couls I use to replace it , or could I use a cable of suitable length from a different boiler? Thanks
  4. D

    Ideal Classic FF230 pilot lights but continues to spark

    Hi When the boiler is needed, the fan starts and the pilot lights but continues to spark. The main burner does not light. I checked the ignition probe and found the lead was damaged so replaced it but I have the same symptoms. The fault finding guide suggests replacing the PCB but I would like...
  5. Eyespy999

    Rothenberg sperfire 2 not igniting

    Evening, My superfire has stopped igniting, It has been intermittent and now wont spark, is there a quick fix or is it a replacement job? Its only 15 months old. I could use a match to light it!
  6. G

    Intermittent spark sound from boiler

    Hi All I have an Ariston Combi 23MMFI boiler and while it is on, now and again I can hear a spark sound from the unit, it's a single sound not like something is shorting out or continual crackling or sparking. It is separate from the igniter when it goes boof to light burner, it is after that...
  7. S

    Alpha cd35 c spark genny

    Hi al,l a customer of mine has a apha cd35c not sparking, replaced the genarator lasted a day and stopped again, replaced again and fitted new ht lead thinking it was a duffer, and its stopped again 2 days later no spark again. i see the genny has 2 lead outs, my ht lead is in the left hand...
  8. P

    Dumb question from a spark....

    I'm fitting a Triton thermostatic mixer shower in my son's flat. The mixer valve has 3/4" BSP female outlets. I planned to use 15mm x 3/4" male elbows, but...... When I screw in the elbows, they don't end up in the downward facing position I want. There's got to be an obvious answer (apart from...
  9. Simon F

    Halstead combi, spark but going to lock out

    halstead combi finest gold 47-333-07 getting a spark but failing to fire up, going to lock out after 3 attempts. faulty gas valve?? no gas pressure at burner whilst sparking possible fault with diverter valve, water has been temperamental but is improved by firing heating up. ( before...
  10. B

    Spark electrode on unica he

    I've never personally removed them on a unica. Other engineer I work with said he doesn't renew the washer on it if he takes it out to clean it or inspect it. He says sometimes the the washer splits in 2 but he fits it back and analyses it to make sure it's OK. Surely that's not right? I'd...
  11. phil hair

    potterton performa 24 eco he flaim failure

    i have been trying to fix a performa 24 eco he, flame failure fault. (before you ask, yes i am, 546451) originally there was no spark, replaced the spark generator/wire and it was up and running, bobs you uncle, on my way, thank you very much. 2 hours later the lady phones me, its not...
  12. K

    No spark

    Mexico Super2 RS70. After a very recent system flush (to stop kettling) the boiler went off, there is no spark, therefore no ignition. After the powerflush the kettling returned once the system had reached fully heated (albeit slightly muted). I did not notice that the powerflush...
  13. O

    Ideal 80N boiler spark generator 076115

    It's broken and I need a new one but it looks lioke it's obsolete. Can some one help me? I'm cold at 75! Alfie
  14. P

    Help no spark

    Problems with a worcester camry greenstar. There is no spark across the electrodes. Have tried 2 diferent control boxes , 2 solenoids and 2 photocells as well as checking the pump and the ht leads . there is 50v across white wire. the motor and fan runs continuously but no spark comes across...
  15. M

    Old worcestor 28 junior.... Try's to spark for 2 secs goes to lockout...

    As title... Only try's for 2 seconds goes to lockout?
  16. D

    Can I trust my plummer

    Hi All,I recently had a Ravenheat 780 combi installed but it became very tempermental and will not light sometimes. I was told it is the spark electrode faulty as the ignitor (ayman's term) can be heard trying to light the boiler but there is no spark. I had the electrode replaced but no luck...
  17. Q

    Thermecon with intermittent spark

    Hi Everyone, I have my oftec but am relatively new to oil and am after a bit of advice please. I went to a customers today whose boiler - (Thermecon) wouldn't start but went to lockout. Whilst trying to start it I could hear the spark and it was intermittent, after a couple of goes it started...
  18. M

    potterton performa 24HE no spark

    Hi everyone I am a first time user, when I call for heating or hot water my boiler makes all the clicks and sounds with the fan running as it should, but the boiler does not spark, but when I gentle blow into the air pressure switch it makes a click sound then the boiler sparks then the burner...
  19. B

    RIP lyn powerpoint the spark

    knew the bloke,not well but would talk to him if i seen him in the merchants killed yesterday in a head on smash,truck crossed the central reservation,the road in question has claimed many lives over the years,makes you realize how short life is BBC News - A465 Resolven crash: Man, 45, dies...
  20. R

    promax 28 he a, intermittent e133 fault

    problem only occurs on central heating, replaced spark probes already as slightly bent, correct voltage from board to spark generator 190v Dc, signal from flame proving probe fine. heating fires up initialy but once at temperature does not cut back in, will do if you run dhw flame then stays...
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