This last month ive replaced all the wishbone bushes front and back with poly ones, along with shocks and track rod ends. There is no play in the steering at all. New wheels and tyres have also been fitted. Tracking has been done twice - all four wheels.

There seems to be a bit of play in the drive train affecting the steering though. Its most noticeable on a smooth road surface in a straight line such as a motorway for example at all speeds.

If i apply the gas, the steering wheel twitches to the right. Enough to be noticeable. Maybe by a cm in rotation of the steering wheel.

The opposite happens when i let off the gas, the steering wheel twitches to the left.

Is this normal? I doubt it..... Any suggestions on what to look for?

as everything else seems to have been checked
tyre pressures?
tyre tread depth/pattern/make ?

I would want to establish that the 4wd is delivering power correctly to both front and rear. No / not enough power to the rear could make the front wheels kick. I would expect it to show more when flooring it with some lock on like going into a roundabout slowly and then booting it. FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

It's called "Torque Steer" and is a common problem with transverse engines - this article covers it fairly well (and before anyone points out that our cars are 4 wheel drive - they are in effect 2 wheel drive most of the time)
https://practicalmotoring.com.au/car-advic...or-doesnt/ No Longer the owner of a 2013MY Fuji White GS

"Fiat Lux" a philosophy not a car

I agree with YBob, the 4wheel drive should kick in long before enough torque is applied to front wheels to get any kick back.

Of course you may have altered the equation by fitting much stiffer bushes.

I have always been very impressed by my FL2s in the way they can get their power down on the road in the lower gears.

Other powerful cars I have driven in the past have displayed difficulty at lower speeds. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)

Leftofcentre did you sort out the similar problem that you posted before?

http://www.freel2.com/forum/topic32217.html FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)

Tyres are Pirelli Scorpion with aprox 5mm tread on all (Wheels from an Evoque - changed from badly kerbed 19" alloys to 18")
All tyres at 32PSI as per spec on door pillar.

Ive removed the Haldex fuse so will report back on 4WD tomorrow. Car had recon Diff and Haldex service around May this year.

I was told on a prev post that the FL2 does not have torque steer. Is that fact or opinion? Can i assume you then have similar symptoms Westville?

IanMetro - the new bushes and shocks, Wheels was an attempt to fix that problem and i must admit its mostly gone. However an issue remains as above.

Thanks for your comments.

I take it that your FL2 goes straight when braking very hard. Ruling out anything moving in your suspension.
Do bumps in the road effect direction of travel? Have you any fault codes lurking in system?
Do you get wheel spin if you accelerate very hard from standstill, and do you run straight?

In the transmission, the FL2 has things like equal length drive shafts, to try to design out any torque steer, even without taking the advantage of the 4 wheel drive.

I have looked on the web and at road tests and nobody seems to believe that the 4x4 FL2 has torque steer or any thing else other than 'light but direct steering'.

I believe that your MY FL2 has a Haldex gen 4 unit, which has a separate pump and should be very responsive. From what I read, these pumps can get a bit 'iffy' with time as they are continually cycled on and off. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)

Yes all is fine with braking hard. Bumps, grooves, camber have minimal affect now that the bushes and shocks have been replaced. Only thing i can comment on is there is slight tyre squeel on turning into a road where i live although the road surface is very smooth and shiny.

May i ask how the Haldex would cause a twitching steering wheel in your opinion?

If all the power goes to the front it will snatch. FL2 MY10 TD4 GS traded in at 2 years
FL2 MY13 TD4 GS Current

Quote:

I was told on a prev post that the FL2 does not have torque steer. Is that fact or opinion? Can i assume you then have similar symptoms Westville?

Not on my FL2 have had it on other vehicles which is why I am aware of it - offered as a suggestion as you seem to have tried all the other obvious culprits
It seems some cars do and some cars don't as Racey might say  No Longer the owner of a 2013MY Fuji White GS

"Fiat Lux" a philosophy not a car

Both front halfshaft are the same length, so no torque steer on FL2.

I would check the alignment.
A static toe out situation will lead to your symptoms, as when accelerating the toe out is accentuating.

Ok so driven today with haldex disabled.
With moderate acceleration both front tyres screach like a boyracer.
Hard acceleration the front end jumps about and it tries to “walk” down the road. In other words, the steering tries to snatch right and left, especialy if i let go of the wheel (for investigation purposes).

Haldex re-enabled, all symptoms above disapear, bar the slight twitch on taking power as originaly stated.

If accelerated hard though, the front tyres do still squeel slightly with the haldex enabled. Pressures are ok. Decent tyres being Pirelli scorpion. Tracking done twice using Hunter 4 wheel in last month.

Any further ideas? I gather these symptoms are NOT normal?

Leftofcentre
Firstly thank you for the very good description of what we can expect if the Haldex fails. Although I hope not to have to experience it.
I have re-read the steering part of the Repair Manual and I cannot see that it can be other than a damaged item in the suspension or a misalignment. There is one other possibility, that is a fluctuation in the steering pump pressure causing the steering wheel to feel as if it is moving. I just can't see why or how this can happen??? FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 76k+ miles) (MY2015)

No worries Ian

I was wondering if this could possibly be a front diff issue? Transfering drive in an odd manner?
Literally everything has been replaced apart from the steering rack. And there is zero play in that so im stumped.
Unless the two places that tracked it have both cocked up or used uncalibrated equipment? Unlikely..

I guess i’ll just learn to live with it until such time that something becomes more obvious.

Just wondering how the two wheel drive FL2 gets on??