1 and 3 are normal, good colour but 2 and 4 are like this.




Can someone please help? Is it to rich fuel mixture or oil? Im a bit worried im going to have a big bill soon

Help please.

Clean them up, swap them around, run a week and check again. Come back with the results.

It is not advised to clean platinum/iridium plugs...

Anyone have any input?

They don't look to bad to me.
( Light) brown to grayish, nothing wrong i.m.o.
You have to worry if they are black ( oil) or white ( to lean mixture).
And with a soft copper brush, you can clean any sparkplug, just don't use force.

They are a more of a white but are a tad darker than white.
The reason i am worried is that i had brand new plugs a couple of months ago (replaced myself) and the plug in cylinder two has failed? It started mis firing so i went through all the procedures to diagnose and it was the plug.
It was black and wet when i removed it but i had to drive home with it mis firing (i wasnt far away) but it doesnt explain the failing. No signs of detonation?

I had the ignition coil for cylinder 2 fail about 3 months back.
Seems to be the same cylinder or is it just coincidence?

Also, i cleaned my plugs up before i replaced them and didnt use force and it would randomly misfire, since changing it hasnt happened so it weakens the plug.

Cheers for the comment mate.

What brand do you use?
I have good experiences with Bosch +4 sparkplugs in Italian cars.

Peter Pick-Up said:

What brand do you use?
I have good experiences with Bosch +4 sparkplugs in Italian cars.

Click to expand...

They are ngk, it seems to be the only ones available for the t-jet apart from the ones fiat sell.
How do i find other alternatives?
Tried gsf/eurocarparts and shop4parts (sell the ones fiat sell)
The ngks arent cheap either at £16 each!


Thanks again.

In fact i was wrong, even fiat sell the ngk ones, it seems there are no alternatives.

Have a look here:

http://www.clubplug.net/bosch_ngk.html

Plugs going bad: sometimes bad coil(s) and/or leads can cause this.

www.magnecor.co.uk

Sorry im being a pain but mine isnt listed, even under the iridium section.




This is the failed plug? My guess is it is black due to the misfire and driving whilst its misfiring.
Or is that oil? Im guessing it will work if i clean it :/

Peter Pick-Up said:

Plugs going bad: sometimes bad coil(s) and/or leads can cause this.

www.magnecor.co.uk

Click to expand...

One of my coils is brand new, should i replace the rest? :/

I would.
I also would buy a set of premium leads.

Sweex said:

Sorry im being a pain but mine isnt listed, even under the iridium section.
/

Click to expand...

Sometimes you have no other choice....!

There are no leads on the t jet, its all electrical, individual coils with electrical wires going to them, not leads.

Stick with all new coils than.
(I.m not to familiar with your specific engine, I'm afraid....!)

Well thanks for your input anyway

If the plug is misfiring it will look different. The deposits are unburnt/improperly burnt fuel. This does not mean the plug is at fault.

Swap them between cylinders and try again. Clean or dirty. If the misfire moves, take the plug back and demand a replacement. If the misfire stays on cyl 2, look at leads or coils. Swap components to see if misfire moves.

Move leads around first. This tests the leads.
If no change, swap the coils around. When the misfire follows the component, you've identified it.

portland_bill said:

If the plug is misfiring it will look different. The deposits are unburnt/improperly burnt fuel. This does not mean the plug is at fault.

Swap them between cylinders and try again. Clean or dirty. If the misfire moves, take the plug back and demand a replacement. If the misfire stays on cyl 2, look at leads or coils. Swap components to see if misfire moves.

Move leads around first. This tests the leads.
If no change, swap the coils around. When the misfire follows the component, you've identified it.

Click to expand...

Ive already done that and its the first thing i did. I swapped 1 and 2 plugs around and it moved the misfire to cylinder 1. A different, working plug and the car is perfect again. You think its a defective plug?