Had new tyres last week , noticed it's pulling to the right after,been for tracking this morning still bad , swapped the wheels round still the same ,any idea where to start looking ?? Thanks peri 2017 tdci econetic

Under Braking, or Accelerating ?

1 minute ago, Paulkp said:

Under Braking, or Accelerating ?

All the time , faster I go the worse it is

So, when you brake it stops in a straight line ?

54 minutes ago, Paulkp said:

So, when you brake it stops in a straight line ?

It seams to be the same when braking,still pulls , nothing seems to affect it

Too much of a coincidence that ...change tyres, get pulling?

Amazed alignment hasn't shown anything and from what you say, nothing to do with braking so must be something on wheels or steering or tyres?
Get the old tyres back if it didn't do this before (not a serious suggestion but something has obviously changed...?)

I'm not sure either ! But what if the o/s rear drum was binding ?

Worth jacking it up and spinning all the wheels to see how they rotate, and if they are on square, and checking that one wheel hub is not getting hot after driving?

The only thing likely to cause this is a worn rubber bush on the wishbone. The wheel will get pushed further out of alignment the faster you drive, but then go back to the original position when stationary.

I agree it's very strange it only happened after a tyre change though.

Been to a mates this morning , swapped all wheels around again ,same ,he's been under the car ,can't see anything obvious

What about a very close inspection of the rubber bushes as suggested by @TomsFocus , were you able to focus on this (lever it with a long bar to look for play/damage?).
You may have ruled out tyres.

33 minutes ago, Shearers said:

What about a very close inspection of the rubber bushes as suggested by @TomsFocus , were you able to focus on this (lever it with a long bar to look for play/damage?).
You may have ruled out tyres.

Swapped all wheels round to see if it makes any difference , think I'll order some wishbones

14 minutes ago, Perimold21 said:

I'll order some wishbones

I'm no expert on these at your age (do they have an issue on Fiesta 2017 as ours are still fine at 15YO) but suggest inspecting first rather than guessing - up to you of course!

Yes, it's easy enough to test them before replacing. Just get a pry bar in everywhere.

Alternatively get a trusted assistant to sit in the car with the handbrake on tight and then load up the clutch in 1st gear while you watch the wheel. If the bush is knackered you'll see the wheel move backwards in the arch when the engine tries to pull away.

Also just thought, have you checked the tyre pressures since the new tyres were fitted? Shouldn't be that if you've swapped wheels around but worth checking as it's free.

I had a knock from front some time ago, and my regular MOT tester ut it on some shaker plates to highlight any bush problem.

Straw clutching, are your track rods the same length each side ?

1 minute ago, Paulkp said:

I had a knock from front some time ago, and my regular MOT tester ut it on some shaker plates to highlight any bush problem.

Straw clutching, are your track rods the same length each side ?

I'm unsure about track rod length ,I had the tracking done yesterday,

Going back years, it was thought by some people that track rod length could be used to centralize the steering wheel, when steering straight ahead. But if the ratio between track control length and track rod length is not the same on both sides, then you can get a steering effect with suspension movement.

So unlikely that it is the problem, but a simple check to make.

7 minutes ago, Paulkp said:

Going back years, it was thought by some people that track rod length could be used to centralize the steering wheel, when steering straight ahead. But if the ratio between track control length and track rod length is not the same on both sides, then you can get a steering effect with suspension movement.

So unlikely that it is the problem, but a simple check to make.

How would I check?

I'm not familiar with a car a new as yours, but if you count the number of threads showing where the track rod end goes into the ball joint it will give you a good idea.

It will look a bit like this, but not a shiny !

Is the steering wheel straight ahead when travelling? If one spoke of the wheel is higher than the other side it usually means the steering alignment has only been altered on one track rod. The best way to check the alignment is with a full steering geometry check which shows the caster and camber angles in addition to toe-in/ toe_out.

On most ford cars the caster and camber angles are not adjustable, and any variation from spec would be caused by worn bushes or joints or more likely a bent component. Sometimes new tyres can exaggerate a slight pull and make it more noticeable.

1 minute ago, Alun Dutfield said:

Is the steering wheel straight ahead when travelling? If one spoke of the wheel is higher than the other side it usually means the steering alignment has only been altered on one track rod. The best way to check the alignment is with a full steering geometry check which shows the caster and camber angles in addition to toe-in/ toe_out.

On most ford cars the caster and camber angles are not adjustable, and any variation from spec would be caused by worn bushes or joints or more likely a bent component. Sometimes new tyres can exaggerate a slight pull and make it more noticeable.

No the steering wheel pulls to the right , I can hold the steering wheel straight and it drives straight ,as soon as I let go it steers right

Which almost guarantees that one of the wishbone bushes (which are almost impossible to see as they are located inside the subframe assembly and thus shrouded from view,) is worn out. The increased grip from new tyres accentuates the leverage on the bush and the tracking can not be assumed to be accurate because of the excessive slop in the suspension. It may have made matters worse.

Have you had a word with who fitted the tyres ?