Spark plug issues

[jolucy1981]

So I have had misfire issues
I had spark plugs and coils changed
I had another misfire and was told the spark plugs looked they they hadn't been changed
My question is how would car run for a few weeks of they hadn't been changed?
Also could they have been changed but the car is causing them to fail and look dirty etc...

 

[Mottie]

Need a close up picture of the spark plug electrodes to tell if they are recent.

 

[jolucy1981]

These R what they removed

 

[Burnerman]

Iridium spark plugs can last for ages......even 50k miles or more.
They last well because the voltages used are very high, and the current very low - this prevents the plugs from burning away.
Theose plugs look a little past their best, from what I can see so new ones are a good idea - the price can be eye watering though!
John

 

[Burnerman]

The right hand plug seems to have a large gap, but other than that they don’t look that old.
How many miles are they supposed to have done?
John

 

[Mottie]

The third from left looks different and newer than the others.

 

[Burnerman]

The left two seem to have some green verdigris on the insulator.....pretty unusual these days!
John

 

[jolucy1981]

They were supposedly replaced in November ( I do 3000miles a year)
Then in Feb said I needed another as one was faulty.
Surely they can go that quick unless car is doing something to them.
If they hadn't changed them how would the car drive a few weeks?

 

[jolucy1981]

For arguments sake and they were changed recently
Do they look like there is to rich fuel or oil getting into them?

 

[Mottie]

They do look like it’s running rich but thinking about it, were they taken out when the engine was at working temperature or just after it had been started from cold?