Spark plug electrode broke off

This topic has 15 replies, 6 voices, and was last updated 3 years, 6 months ago by Nateodog.

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June 5, 2021 at 4:46 PM #173681

Olaf Williams
Participant

South Africa

Posts: 11

Hi Guys,

Yesterday got CheckEngineLight and car had a slight rough idle. Checked the spark plugs the one that had a broken electrode look really odd, see picture.

Replaced the plugs with OEM and car is pulling strong again, should I be concerned about the piece that broke off? Im hoping that it just went out the exhaust valve and is sitting in the cat.

Any feedback would be appreciated.

Regards,

June 5, 2021 at 5:59 PM #173684

nicklulu
Participant

USA

Posts: 1756

I would had a borescope and checked the cylinder before replacing the spark plug.

June 5, 2021 at 6:08 PM #173688

71-bda
Participant

UK - England

Posts: 9256

are you running a tune ??

No nothing.

No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.

No tackiness.

Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.

Innit?

June 6, 2021 at 7:53 AM #173715

Olaf Williams
Participant

South Africa

Posts: 11

Stage 1 Revo Tune with 100% stock hardware

June 6, 2021 at 8:20 AM #173716

71-bda
Participant

UK - England

Posts: 9256

are you running low octane fuel?? If the other 3 plugs were showing signs of overheating/melting etc I’d be worried that you are on the cusp of LSPI !! but as the other plug appears to be ok, its possibly just a faulty spark plug , are you running std heat range plugs? maybe one stage colder might suit?

No nothing.

No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.

No tackiness.

Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.

Innit?

June 6, 2021 at 8:20 AM #173717

Olaf Williams
Participant

South Africa

Posts: 11

Just to add, its a 2016 plate with only 43000 kms (27 000 miles) on the clock. Plugs have never been changed

June 6, 2021 at 8:38 AM #173720

Olaf Williams
Participant

South Africa

Posts: 11

@71-bda

Just using normal shitty South African pump fuel (E95 unleaded). Im no expert in reading these plugs, but the centre electrode of the faulty is clearly larger than the one next to it (I wonder why)

June 6, 2021 at 8:56 AM #173722

nicklulu
Participant

USA

Posts: 1756

Are they the same part number on the plugs?

Have you checked cylinder where the faulty plug was from?

June 6, 2021 at 9:11 AM #173724

Olaf Williams
Participant

South Africa

Posts: 11

@nicklulu

Same part number yes. Didn’t have the tools at the time to check to check the cylinder. Figured that its a really small piece so I took my chances. The car is running extremely smoothly at the moment

June 6, 2021 at 9:22 AM #173725

71-bda
Participant

UK - England

Posts: 9256

I think you may find that the porcelain insulator has ‘slipped’ down? have you tried tapping/pushing it back up into the metal body?

No nothing.

No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.

No tackiness.

Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.

Innit?

June 7, 2021 at 10:10 PM #173819

Nateodog
Participant

UK - England

Posts: 1023

Don’t worry that is fine you have been very lucky

and he electrode will just fizzle up in the combustion process

if the ceramic had dropped down Ito the engine is hen that’s a different story as that doesn’t burn and it just gets smashed up inside

change your plugs to one step folder gap them correctly and carry one enjoying it

SABRE

666.6 bhp 99 oct & wmi

558 lbft

OEMeth installs

Aquamist

sabre tuning

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June 8, 2021 at 12:01 PM #173839

white-rs2
Participant

UK - England

Posts: 4832

Their was an issue with the Denso ITV plugs with the ceramic dropping down and covering the electrode.
Your picture shows the ceramic much lower or higher on the left plug covering the electrode.

RS Edition.

FPM375 Rocks

The rest of the “M” maps suck

June 8, 2021 at 9:09 PM #173904

GM
Participant

UK - Wales

Posts: 2841

The ceramic has dropped but there is a bit of the ground missing

June 9, 2021 at 7:23 PM #173980

Nateodog
Participant

UK - England

Posts: 1023

Yes none of that matters really as the ceramic hasn’t dropped into the cylinder as stated very lucky

mine dropped into the cylinder with an NGK plug as they are what’s supplied as stock

SABRE

666.6 bhp 99 oct & wmi

558 lbft

OEMeth installs

Aquamist

sabre tuning

Spec-R

J9-performance

funk motorsport

Hel

Owen developments

WP Pro brakes

HELIX Automotive

KW suspensions

Barney Build

Grant Motorsport

June 9, 2021 at 7:27 PM #173982

Nateodog
Participant

UK - England

Posts: 1023

SABRE

666.6 bhp 99 oct & wmi

558 lbft

OEMeth installs

Aquamist

sabre tuning

Spec-R

J9-performance

funk motorsport

Hel

Owen developments

WP Pro brakes

HELIX Automotive

KW suspensions

Barney Build

Grant Motorsport
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