Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: sophos9 on 09 September 2008, 09:16:20
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Car has been handling pretty bad for ages. Wishbones, droplinks and idler arm all changed within a few miles of each other and a full geometry setup, that sorted some of the weirdness...
I'm left however with the car still feeling a bit like it wants to wander and something weird with the steering.
With the car running and the steering wheel in a neutral position, when I turn the wheel I have about 1inch either way of 'free' movement i.e. does not start to turn the wheels... I'm guessing this is whats at the cause of the remaining wandering? Some time ago I got rid of all the slack from the steering box however have not checked it again since all the work was done.
Now heres the thing, sometimes the steering wheel does NOT have the problem with free movement?
Any best guesses where this intermittent free movement is coming from??
Thanks in advance
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Looking like power steering system to me, have you tried bleeding it by leaving it on full lock for a few seconds? (both locks) I am surprised the fault was not found when the steering geometry was done.
Sorry I can't be of more help.
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i have driven a phew omegas now and all have had this inch of play feeling you discribed. I have put this down to the box play you suggest. I have hurd that a box has more play than a rack?? Dont know myself but it does make you wonder. Only thought, was the correct torquing proceedure followed when doing up the wishbone bolts? Ie loose on the ground with the car settled and suspension taking the full load of the car, then tighten to 120 ft lbs and then angle tighten the rest?(check thats correct im working from memory). If not the bushes may well have gone again. Other than that, i guess check track rod ends and the rear end of the car?
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Thanks for the reply... The geometry setup was done by STS and they left the steering wheel off centre - going back for its 500mile check soon so will put my parts on :(
Do you know how often should you change the power steering fluid, can you tell me a bit more about the bleeding procedure?
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Wishbones were new about 500miles ago and should have been done correctly (I did not do them however the bloke that did should have been aware)...
I'm wondering about play in track rod ends as they form part of the steering mechanism. To test play, do I check for available play from 3 and 9 oclock?
Should there be any play at all?
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full geometry setup,
Was it a proper full setup or just tracking?
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Hi,
Was full front and rear camber, caster and toe
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Well, you need to check for play in the steering components (idler, track rod ends etc).
You can also dial out some of the box play. Engine on, steering wheel turned a quarter turn and wind the bolt on top of the box in up to about a quarter turn whilst wiggling the steering wheel to feel the play reduce. Dont over do it though or the box goes stiff!
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Will give those instructions a go tonight, when I did it some time ago, I did not put the steering wheel quarter of a turn...
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i think you need a trip or 2 to wim. 1 to diagnose, go away and fix whats wrong then go back and do the final FULL geometry set up. Maybe give Tony a ring. Hes i good guy.
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It def needs someone who really knows what they are doing to look over and diagnose otherwise I'll end up replacing everything and still have a problem!!!
Idler is fine, no play and replaced in the last 10k
Will try Marks suggestion tonight, can someone confirm how to check for track rod ends pls?
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It def needs someone who really knows what they are doing to look over and diagnose otherwise I'll end up replacing everything and still have a problem!!!
Idler is fine, no play and replaced in the last 10k
Will try Marks suggestion tonight, can someone confirm how to check for track rod ends pls?
Simply look for play in them.
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Cheers
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Got this resolved at Vauxhall today, cost £273!!
I've never read about this problem before however it turned out to be a servotronic electronic control module failed. Dont have the part number but its what controls the amount of assistance that the power steering gives, there are 2 one for the left and one for the right
This had failed, diagnostic had to be done by a technician. Tech2 did not pick it up, reported servotronic was fine. The technician has been with Vx for about 15years and remembered this problem a few times - luckily they had the part in stock.
Steering is now awesome, straight with good resistance either way, car drives perfect! The Omega has done this for the last 3years so now its going to be great to be able to actually drive it!!!
What I was experiencing:
Wandering
Pulling to one side
Constant adjustments to steering which changes at differing speeds
Always having to correct any turn
Random pulling
'Slack' in the steering wheel
Steering wheel slightly over to one side
Hope this helps!
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Sounds like a right load of 'dangle berries'....there are only two items in the control setup for servotronic and these are:
Servotroinc control module (a small relay type device behind the glove box)
Steering box....which simply has an actuator in it.
So, what exactly did they replace!
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Receipt says servotronic control module... £105 ex VAT
Rest was diagnostic labour, checked over all front / rear components, self levelling suspension operation, tech 2 diagnostic etc
Not good then mate?
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Not great no.....so all they have done is replace the bloody relay module......Wonder if they checked the coding first.....is the steering now heavier or lighter?
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Nice :(
Do not know if it was programmed or not, does say tech1 work on receipt. Steering does not feel any heavier or lighter....
Is it a big problem if its not programmed?
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oh and part number is 24410986
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oh and part number is 24410986
I hope this guy has the wrong part number :o :-/
http://shop.ebay.co.uk/?_from=R40&_trksid=m38&_nkw=24410986+
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Thast the bugger....its more than a relay as it has a micro controller in it....got a few in the garage.
They did of course mean TECH2 work I trust!
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omfg.... please NO :-/
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There are a few variant options basd on the steering box and age of car.....so they should have checked that was correct first
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Mark, are you saying that the eBay item is the same as the £105 part they put in today?
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Mark, are you saying that the eBay item is the same as the £105 part they put in today?
Yes.....although that item on ebay I suspect is second hand and the seller just thinks its a relay.
I am AMAZED they had one in stock!
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The bloke did say that he was totally amazed as they dont ever see any Omega's in the workshop anymore.
Man, I feel well done over knowing what I know now :-[
On the flip side, I took the car there as I was at my wits end and could not fix the problem, had no idea what it was, was about to get rid of the car and Vauxhall did fix the problem
My arse is sooooo sore :-[
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Mark, are you saying that the eBay item is the same as the £105 part they put in today?
Yes.....although that item on ebay I suspect is second hand and the seller just thinks its a relay.
I am AMAZED they had one in stock!
maybe had one in stock and wanted to get rid... i had servo tronic relay go on me before on old mig, purely changed the strength of resistance felt at the wheel ie intermitantly alot stiffer.
it was suspected and could only be confirmed by tech 2 ,which it confirmed,
i just bought a new one and plugged it in behind glove box, cured. still handled crap as geometry was all to cock at the time.
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Mark, in your opinion - with this failing, would it cause the issues that were cured today?
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Mark, in your opinion - with this failing, would it cause the issues that were cured today?
Difficult to see how, you state that the TECH2 showed nothing up but, if it was failed I would expect it to not talk....or at least the live data to be errored.
The ideal would be to have the old part for diag.
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The Vx Tech said the Tech2 does not cover the diagnostic of Servotronic on the 1997. I used my Vauxhall Diagnostic Scanner (bought from UK ODB) to check, Servotronic came back as no fault codes.
The receipt say that the Vx Tech had to refer to TIS to diagnose and just says tech1
The problem is resolved for sure. I pretty much done everything - what could it have been outside of the what they *fixed*?
This is what I checked/replaced
Full Geometry Setup
New wishbones
New droplinks
New tie rods
New front/rear suspension (inc. suspension bearings/stops/seals etc)
New steering idler arm
Checked over all rear suspension
Checked ball joints
Checked tyre pressures / wear pattern
Checked PS leaks/fluid
Removed excess play from the steering box
Everything done to Vx spec torque
You can see why I lost the will.... Is there any programming that can be done to 'calibrate' the servotronic?
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The Vx Tech said the Tech2 does not cover the diagnostic of Servotronic on the 1997. I used my Vauxhall Diagnostic Scanner (bought from UK ODB) to check, Servotronic came back as no fault codes.
The receipt say that the Vx Tech had to refer to TIS to diagnose and just says tech1
The problem is resolved for sure. I pretty much done everything - what could it have been outside of the what they *fixed*?
This is what I checked/replaced
Full Geometry Setup
New wishbones
New droplinks
New tie rods
New front/rear suspension (inc. suspension bearings/stops/seals etc)
New steering idler arm
Checked over all rear suspension
Checked ball joints
Checked tyre pressures / wear pattern
Checked PS leaks/fluid
Removed excess play from the steering box
Everything done to Vx spec torque
You can see why I lost the will.... Is there any programming that can be done to 'calibrate' the servotronic?
I will check tonight.
What I can say is that there is a code index that you programme them with based on model year and a code on the steering box......would love to know what the new and old one was/is set to.
99% sure that Tech II can work on all version of servotronic to....as its not changed since it was introduced (will check this also this PM).
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Awesome, appreciate it! Just wish I lived closer to you guys...
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Right
Did a few tests
The servotronic has not changed throughout production (checked with a relay out of a 1995 car that I had) but, you have to set the model year to 1997 on Tech 2.
There are 6 settings, 3 for pre 2000 and 3 for 2000 onwards.
And thats about it!
So, set the car to max assist (code 011 for a 2000 car)....and its to assisted.....all over the place.
Set car back to min assist (code 009 for a 2000 car which is that standard setting) much better......and not all over the place any more
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Cheers mate...
So whats your verdict? They replaced a faulty relay and programmed it correctly or they just reprogrammed the existing relay?
I presume these dont fail often (no info on the web about it!)
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Cheers mate...
So whats your verdict? They replaced a faulty relay and programmed it correctly or they just reprogrammed the existing relay?
I presume these dont fail often (no info on the web about it!)
Never seen one fail....spoke to my contact also......and he rang 4 other dealers to.....and none of them (5 in total) have ever sold one according to thier records.....
I reacon (hope) they replaced the relay.....but its now programmed correctly!
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Awesome, thanks for your help - good thing to know!
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Drove to work this morning with mine set to max assits....and it bloody awful.
Reset it for the journey home before getting out of the car.
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Hi Mark,
Can you define awful? Mine was just wandering all over, needing constant adjustment, front was unable to track correctly and felt like the steering wheel and wheels were not attached correctly....
Is this the same as you experienced?
Thanks for helping out with!
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Hi Mark,
Can you define awful? Mine was just wandering all over, needing constant adjustment, front was unable to track correctly and felt like the steering wheel and wheels were not attached correctly....
Is this the same as you experienced?
Thanks for helping out with!
Exactly that....terrible when cruising at motorway speeds.....it was all over the shop!
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The Vx Tech said the Tech2 does not cover the diagnostic of Servotronic on the 1997. I used my Vauxhall Diagnostic Scanner (bought from UK ODB) to check, Servotronic came back as no fault codes.
The receipt say that the Vx Tech had to refer to TIS to diagnose and just says tech1
The problem is resolved for sure. I pretty much done everything - what could it have been outside of the what they *fixed*?
This is what I checked/replaced
Full Geometry Setup
New wishbones
New droplinks
New tie rods
New front/rear suspension (inc. suspension bearings/stops/seals etc)
New steering idler arm
Checked over all rear suspension
Checked ball joints
Checked tyre pressures / wear pattern
Checked PS leaks/fluid
Removed excess play from the steering box
Everything done to Vx spec torque
You can see why I lost the will.... Is there any programming that can be done to 'calibrate' the servotronic?
I will check tonight.
What I can say is that there is a code index that you programme them with based on model year and a code on the steering box......would love to know what the new and old one was/is set to.
99% sure that Tech II can work on all version of servotronic to....as its not changed since it was introduced (will check this also this PM).
Tech2 can read all systems on all Omegas except:
IR locking/immobiliser
Pre 1997 2.0l engine ECUs
U25DT tractor engine ECUs (ie, non maf ones)
All of which require Mr Omegatoy to turn up with his Tech1.
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Hi Mark,
Can you define awful? Mine was just wandering all over, needing constant adjustment, front was unable to track correctly and felt like the steering wheel and wheels were not attached correctly....
Is this the same as you experienced?
Thanks for helping out with!
Exactly that....terrible when cruising at motorway speeds.....it was all over the shop!
Hmmm, think my MV6 is set for mid setting.... ....I wonder.... :-/
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Exactly that....terrible when cruising at motorway speeds.....it was all over the shop!
Awesome! Good to hear... I spoke to Vauxhall, they said the module would not communicate with tech2 so they swapped it out with a new module and reprogrammed, job done!
Handling is spot on now so despite having to spend a packet I'm happy
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..... so despite having to spend a packet I'm happy
Some times it's best to just ignore the outlay if you're otherwise happy with the reuslt. :y
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Exactly that....terrible when cruising at motorway speeds.....it was all over the shop!
Awesome! Good to hear... I spoke to Vauxhall, they said the module would not communicate with tech2 so they swapped it out with a new module and reprogrammed, job done!
Handling is spot on now so despite having to spend a packet I'm happy
Really....so its Tech2 they used this time and not Tech1.....Should only have taken about 15 mins to diag that one!
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Here is a pic of the little bugger by the way.....I had one in the garage.
(http://i23.photobucket.com/albums/b394/Marks_DTM_Calib/DSC00080.jpg)
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Here is a pic of the little bugger by the way.....I had one in the garage.
(http://i23.photobucket.com/albums/b394/Marks_DTM_Calib/DSC00080.jpg)
They're making a tidy profit on those at 105+VAT :o
Just a microcontroller and a power MOSFET to PWM the valve in the steering box I guess?
Kevin
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I will be*very* interested to hear the answer because I have almost identical symptoms, have done for the last year. New tyres, wishbones and full geo setup have failed to solve it....
ETA TheBoy , I may have to pop round to you and have you set mine to min assist and see if that solves my problem !
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Here is a pic of the little bugger by the way.....I had one in the garage.
(http://i23.photobucket.com/albums/b394/Marks_DTM_Calib/DSC00080.jpg)
They're making a tidy profit on those at 105+VAT :o
Just a microcontroller and a power MOSFET to PWM the valve in the steering box I guess?
Kevin
Yep......I would guess at about 3-4 quid for bits so maybe a tenner assembled in volume.
Its a bog basic microcontroller (freescale/motorola OE38B) with an I2C device (93LC46 - Microchip), a comparator (LM2903) and a PNP transistor ( A1244)....plus a few minor passives etc
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I wonder what difference unplugging it makes? :-/ :y
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I wonder what difference unplugging it makes? :-/ :y
We already know that........heavy steering same as when the fuse blows
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I wonder what difference unplugging it makes? :-/ :y
We already know that........heavy steering same as when the fuse blows
Is that the same as least assistance?
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TheBoy YHM :-)
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I wonder what difference unplugging it makes? :-/ :y
We already know that........heavy steering same as when the fuse blows
Is that the same as least assistance?
I suspect zero assistance......having driven a car with no engine (on tow) for 60+miles).....
Pretty sure the servotronic will not totaly turn off the assistance.
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Pretty sure the servotronic will not totaly turn off the assistance.
That is hard work ... been there too.
I also had the 'fan belt' break on my diseasal Astra mid roundabout. Must be cos the alternator isn't running, the electric pump stops and that's hard work steering too.
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Thanks to TheBoy for re-programming my power steering this afternoon (and the other bits you helped with too, yes I am a lazy bugger !)
The result of changing it to least assistance is that the problem hasnt totally disappeared but I reckon its about 80% improved :y. Still seems to have full assistance at low speed but weights up more once on the move. Where before I was having to make constant corrections moving the steering wheel maybe an inch either way (while going in a straight line) its now only the occasional correction and maybe only half as much movement of the wheel. It also seems to corner in a much more linear way now I can follow a curve without major corrections !
So steering idler is on the cards next to see if I can totally eliminate it.
Cheers !
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Good to hear you got it sorted. Mine seems the opposite though, it feels like the steering is harder at low speeds than high - I thought it should be the other way around, light when slow, heavier when fast??
Can the module be plugged in the wrong way around? :D
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Here is a pic of the little bugger by the way.....I had one in the garage.
(http://i23.photobucket.com/albums/b394/Marks_DTM_Calib/DSC00080.jpg)
Ah! Thats the big bugger behind glovebox? I was looking for another relay over weekend, and noticed that.
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Thanks to TheBoy for re-programming my power steering this afternoon (and the other bits you helped with too, yes I am a lazy bugger !)
The result of changing it to least assistance is that the problem hasnt totally disappeared but I reckon its about 80% improved :y. Still seems to have full assistance at low speed but weights up more once on the move. Where before I was having to make constant corrections moving the steering wheel maybe an inch either way (while going in a straight line) its now only the occasional correction and maybe only half as much movement of the wheel. It also seems to corner in a much more linear way now I can follow a curve without major corrections !
So steering idler is on the cards next to see if I can totally eliminate it.
Cheers !
Well, glad its an improvement, even if not entirely cured...
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My car was still pretty nervous after changing the wishbone bushes. Everything else in the suspension is solid and the geometry is set up spot on now.
Decided yesterday to have a practice with the Tech 2 and noticed the Servotronic was set to the middle setting (10 IIRC). Set to Min (9) and it's transformed the car. There's actually some feedback through the steering now and it doesn't need constant corrective input on anything but a perfect road surface. :D
Kevin
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Oh wow... finally an answer (I hope!)!!!!
Right. I'm an electronics+software engineer, now how the hell do I build/cobble/bodge/buy something that I can do this change with?????
Failing that, a visit to VX ££££..??
Thanks Mark et all...
Edwin
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I imagine it's a Tech 2 job only. Not sure if any 3rd party tools can program it.
Depends on the attitude of the dealer as to how much they'd charge and, TBH, whether they'd even touch it if it is already "correctly" coded for the vehicle. :-/
.. of course, if someone collected a couple of control units from the scrappies and made up a harness to program them they could perhaps be done by post on an exchange basis. The control unit is small enough after all.
Kevin
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Oh wow... finally an answer (I hope!)!!!!
Right. I'm an electronics+software engineer, now how the hell do I build/cobble/bodge/buy something that I can do this change with?????
Failing that, a visit to VX ££££..??
Thanks Mark et all...
Edwin
I have a spare that I could programme up for you to try....
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That would be stunning :-)
Absolutely stunning: its pre-2000 (1998) and I suspect min assist would be appropriate! (and after replacing pretty much every link in the suspension/steering, I have the same symptoms as above....)
Shall we do a swap - I've got a spare on its way to me (courtesy of 3.99 and ebay :-/ ) ?
If you could drop me a PM, it would be *very* much appreciated!
Cheers,
Ed
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I'm having similar or identical problem. Replaced only the shocks and that long thing that goes from power steering pump to wheal (I don’t know what it calls). My power steering is leaking and I taut that the correction in driving has something to do with it, maybe power steering pump has some lose in it, if that is possible.
The symptoms are (especially now with wider tires):
- need to correct the steering wheel when going on straight road, if the road is not so flat (angled or bumps)
- when I turn full to the right and than to opposite only when standing still I hear and feel a bang like click bat harder and is felt throe the car, wary unpleasant
- the power steering pump is leaking
- car is wobbly when changing lanes and if there is deformation between the lanes it is scary :) , it takes me to fast over it like I turn harder but I don’t
- and pullyng to the left when braking
Sorry for bad language I hope that you can understand what I mean
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I'm having similar or identical problem. Replaced only the shocks and that long thing that goes from power steering pump to wheal (I don’t know what it calls). My power steering is leaking and I taut that the correction in driving has something to do with it, maybe power steering pump has some lose in it, if that is possible.
The symptoms are (especially now with wider tires):
- need to correct the steering wheel when going on straight road, if the road is not so flat (angled or bumps)
- when I turn full to the right and than to opposite only when standing still I hear and feel a bang like click bat harder and is felt throe the car, wary unpleasant
- the power steering pump is leaking
- car is wobbly when changing lanes and if there is deformation between the lanes it is scary :) , it takes me to fast over it like I turn harder but I don’t
- and pullyng to the left when braking
Sorry for bad language I hope that you can understand what I mean
It sounds like you have more issues than simply over-assisted steering. Particularly the pulling under braking and noises on full lock make me think you might have a failed wishbone bush or track rod end. I would take a careful look over all the front suspension for anything with play in it.
Was it the steering idler you have recently replaced? If not, this is another candidate for failure.
Kevin
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did not noticed play in any part, i think that ideler was not changed, need to see what was changed, before that change there was serious play in steering wheel now there is yust a little but correction on bad road needs to be done. aligment is ok and car is not puling on fine road (thats rare in croatia :) )
i wish i can change all the suspitious parts but that is lots of money :( so im trying to find the cause and save some money
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After driving the car for a while, I'm still noticing some strange things going on, nowhere near as bad but some I would like to nail so can you help with a couple of questions please...
What will happen if I remove the relay, will the car default to min assist?
If so, Mark - Can I send you my relay for you to check the programming (and/or reprogramme to min assist please)
Many thanks...
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Whereabouts in Norfolk are you?
I can't promise anything, but I'm visiting my cousin in Wymondham at the weekend.
Kevin
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Hi mate,
Thanks for the offer. I'm only about 30 miles away but may struggle as I'm moving. Will pull the relay first, read a previous post by Mark saying it will give you heavy steering - yey that would be good!
Do I have to pull the glove box out to get to it?
Thanks
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Right
Did a few tests
The servotronic has not changed throughout production (checked with a relay out of a 1995 car that I had) but, you have to set the model year to 1997 on Tech 2.
There are 6 settings, 3 for pre 2000 and 3 for 2000 onwards.
And thats about it!
So, set the car to max assist (code 011 for a 2000 car)....and its to assisted.....all over the place.
Set car back to min assist (code 009 for a 2000 car which is that standard setting) much better......and not all over the place any more
Any idea what a code index of 018 means? :-/
Kevin
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Hi everyone, I am so glad I joined this forum,on here two minutes and my god an answer to the problem I have had since i bought my 2000 omega 2.2 3 years ago.
I was so dissapointed when i bought the car cause it handles like a soggy sponge all the symptoms described i am still suffering I am assuming that these units are on all model Omegas perhaps you folks can clarify this for me, I see a mention of programming is this correct or can you simply unplug and plug a new one in? any advice would be more than gratefully received.
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I have a feeling the 2.2 doesn't have servotronic PAS. Only V6s IIRC? I might be wrong... :-/
Kevin
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oh no there was me thinking yahoo at last an answer, is it worth pulling the glove box out and having a look, the symptoms listed are absoluetly spot on and as mentioned in the earlier post on motorways it gets pretty scary and ruts in the road are like a roller coaster ride.
I love the car to bits and thats why i have stuck at it, the misses has driven it once and said oh no not for me its all over the road never got behind the wheel since.
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Might be worth having a look. I have conflicting information here. :-/
Otherwise, the usual suspects are worn front wishbone bushes, play in steering idler bush and suspension geometry incorrect.
Kevin
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I've been following this thread with some interest as I'm not entirely happy with my steering either. I've always suffered with a bit of tramlining but have been told its fairly common with the wider tyres I have on the Azev rims. I had the geometry done at WIM earlier this year as well as new front tyres, and Tony also checked the wishbones, steering idler, etc. and said all was ok but said one of the wishbones had a very tiny amount of play but said it wouldn't need replacing for some time. It was noticeably better after the WIM treatment but seems to have got worse again, particularly on uneven road surfaces where it tends to wander with the ruts and bumps in the road. There's no play in the steering either so I'm wondering if I might need the steering assist settings adjusted that have been mentioned in this thread?
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Hi guys,
I have spoken to a mechanic friend at work last night who is mates with an ex vauxhall technician he is going to try and find out if my model has the unit fiitted hopefully this will save me pulling out the glovebox in vein, its amazing how long I have put up with this at one stage I even thougth the car had been front ended badly and put back together slightly bent, however its a relief to learn that the symptons others describe fit the problem i have perfectly.
I have had new front wishbones,tyres and tracking done with next to no noticeable improvement the tyres wear evenly and the car looks balanced the rear shocks and springs have also been replaced thinking perhaps that was causing the floaty vagueness being experienced but alas its still there.
whats strange is somedays its feels almost normal to drive then others its here we go get the stetson and cowboy boots out its rodeo time if you know what i mean.
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I know exactly what you mean, mine is still randomly wandering around - think I will just pull the relay and see how it goes
(if I can find it, can someone post a pic or a quick instruction how to get to it please??)
Thanks
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There is a pic posted in the earlier threads it looks from what i have seen like a standard plug in relay from the outside, the cover in the pic i have seen is red, but looking at the internal components its obviously more than just a relay it has a small what looks like a mirco processor or chip, thats where i guess the need too program it as per model comes in.I would try and add the pic but can't figure how to do it yet lol.
Hope this helps
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Quick update, the car was great for a period of time however its reverted back to its usual of wandering all over the road (really bad) so today I have just pulled out the servotronic control module and will see how I go without out it.
My suspicion is that the module is blowing somehow - may be wrong.
Any ideas how to test the module (Mark - could I post it to you please for a check on its programming status (want least assistance)
Will I cause it any damage to drive around with the module removed?
Thanks for your help
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Have you checked that it is not the front tyres causing the problem, my michelin pilot primacy tyres were perfect but the pirelli p7000 tyres that i have now are very nervous on some roads and get a lot of tramlining, A trip to WIM did help but tony explained how some tyre designs do not help with certain suspension set ups. when i need to replace the tyres i will go back to michelins.Can you swop your tyres around if you have other brands on the rear from the front,and make a comparison, also have you checked tyre pressures with a calibrated gauge. Gary
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Have you checked that it is not the front tyres causing the problem, my michelin pilot primacy tyres were perfect but the pirelli p7000 tyres that i have now are very nervous on some roads and get a lot of tramlining,
Add that because OEM Omega tyres were Pirelli's
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My CAR CAME WITH MICHELIN PRIMACY AS STD.[sorry not shouting] HONEST.!!!
;D