Spark Plugs

[Willieo]

When to change normally? and any risks? I read some issues about the Ford engine stripping threads for the spark plugs on plug removal.

[ksilver]

I think the service manual recommends replacement at 90,000 miles but I would think everyone on here would be a bit more frequent.

I replace mine on the major services (based on OBC alerts that works out at 18,000 for me).

The heads are very soft so do not overtighten, I think 12 - 15 lb/ft torque max.

Have a look here.

[GeoffW]

With the supercharger change every 12K I think, Scooter recommends to remove
once a year lightly copper slip thread and refit, As the TR6 are only just over £ 20.00 a set I put new ones in when I do yearly service, K Silver is right with the torque , not too much

[2V8s]

the original platinum plugs do have a long life, but are more expensive. I do recall the planned first change is after a suprising amount of miles, somewhere between 70k and 90k but I cant remember now

If you change to copper, you will need to change them more frequently but they are much cheaper and to be hinest probably work just as well.

I spent quite a bit on NGK Iridium plugs, and not really had any difference.

[ColinE]

I spent quite a bit on NGK Iridium plugs, and not really had any difference.

Would agree and won't be doing it again

[Willieo]

Think I might leave them alone then. Since new only 65k and running fine. It would be nice to get more than 23mpg but you cant have everything.

[2V8s]

23 MPG - wow you're doing well

[bleeperman]

If it ain't broken don't fix it! Good term for the plugs on this car. The EML will tell you soon enough when you are misfiring.

[MichaelG]

the original platinum plugs do have a long life, but are more expensive. I do recall the planned first change is after a suprising amount of miles, somewhere between 70k and 90k but I cant remember now

If you change to copper, you will need to change them more frequently but they are much cheaper and to be hinest probably work just as well.

I spent quite a bit on NGK Iridium plugs, and not really had any difference.

Do you know the part number for the copper plugs?

I would like to change mine once a year/5000 miles so that I can check the deposits on the plugs at the same time and I would like the cheaper copper one but can't find the right model.