Something Seriously Wrong With Car, Need Advise/Help Please

[PhilT]

As above there is something seriously wrong with the car so I will explain what its doing. Sorry its a long one! The car is a 2013 C63 Saloon with a V5 Eurocharged Remap.

It has 4 new tyres on which are Michelin Pilot Super Sports which where fitted in December & I would have a guess at the car has done 2000 miles if that since they were fitted.

Note this is even on a straight and worse going round bends. AND the Tyre pressure monitor has come on twice recently and I have checked pressures & reset them but it has come on again.

In s+ the traction light is coming on in 1st and 2nd seriously cutting the power even in the dry. It never used to do this, It used to be fine even in the dry

In s+ and sport mode turned on which normally lets a little bit of slip, The car is pulling all over the road like its on ice with 1000bhp in the dry (Seriously grabbing onto the steering wheel fighting to keep it straight). It never used to do this, All it used to do was like normal allow a tiny bit of slip but no wheel spin and the car would drive straight

It feels pretty dangerous to be honest and I always used to have fun abit round the bends but I tried it while it was like this once and it was not easy to control at all.

I have also noticed the front end seems like it was gone light & also the car even in comfort in the dry when it sets off in 2nd gear traction kicks in this is on a straight and worse when setting off on a bend.

I have put the right pressure in the tyres as advised in the fuel cap too. They are also standard tyre sizes for the 19" optional wheels.

I hope you can help as I have no clue what could be up with the car and I am normally pretty good with cars. I remember having a little bit of wheel spin on the yoko tyres and the car didnt feel as fast which I put down to needing new tyres and it has been worse like above since.

It was fine for 2.5 years since I have owned it from new (remap since new) till just before symptoms started before the tyre change.

This also maybe relevant, When it was on the yokos I had a blow out on the rear drivers side at only 20 mph and pulled over straight away which I admit was due to myself as I did not check the inside of the rear tyres which had both worn down to the canverse, Part of the tread came away from the tyre and flapped about in the wheel well. (This was over 1 year ago)

Also 2 weeks ago I took the car for a good drive and the tyre pressure monitor came up with check pressure, I was in the middle of no where so parked on a flat surface and all the tyres looked like they were inflated, the car drove fine for 1 hour then 5 minutes from home there was a lot of road noise and the car felt like the tyre was coming off so I pulled over straight away into a petrol station and the rear drivers tyre had gone completely flat! I tried to put air in and it wouldn't hold pressure. I swapped it to the spare and drove home and checked the wheel/tyre. The tyre was ripped which was because it was flat when I drove into the petrol station and there was a cut in part of the tread which may have been the cause for it going flat. I took the wheel to a wheel repair place and they took the tyre off to inspect the wheel which they said looked fine apart from the inner wheel did move slightly on the wheel weight machine but he said that wasn't enough to cause any problems. To be safe I bought a brand new rear wheel and tyre but I still have the problems.

 

[brucemillar]

I am guessing here.... You may have snapped a drop link or shredded a suspension arm bush. Running with a flat (even a short distance) put's a bigger load onto the suspension. Drop links, springs, suspension arms are all made out of chocolate on Merc's. I would get it up in the air and have a good look around as well as a good heave on the suspension.

 

[ash59fifty-uk]

As above, because what you're experiencing reminds me of something that regularly happened with an XR3i I had many moons ago. I didn't get tyre problems but it literally felt like I had skateboards beneath the back wheels.

Horrible feeling. This happened twice, whatever caused the original one to snap, and for the replacement to snap a few months later I couldn't work out

 

[grober]

http://www.mbclub.co.uk/forums/2102646-post68.html

As suggested probably something worn/broken on the rear suspension

THE COMPLETE THREAD
http://www.mbclub.co.uk/forums/amg-lounge/190753-very-unstable-c63-coupe-5.html

 

[PhilT]

I am guessing here.... You may have snapped a drop link or shredded a suspension arm bush. Running with a flat (even a short distance) put's a bigger load onto the suspension. Drop links, springs, suspension arms are all made out of chocolate on Merc's. I would get it up in the air and have a good look around as well as a good heave on the suspension.

As above, because what you're experiencing reminds me of something that regularly happened with an XR3i I had many moons ago. I didn't get tyre problems but it literally felt like I had skateboards beneath the back wheels.

Horrible feeling. This happened twice, whatever caused the original one to snap, and for the replacement to snap a few months later I couldn't work out

Thanks for the replies, I will book the car in next week as its not safe at the moment. The car has been fine for 2.5 years since owning from new till now.

http://www.mbclub.co.uk/forums/2102646-post68.html

As suggested probably something worn/broken on the rear suspension

THE COMPLETE THREAD
http://www.mbclub.co.uk/forums/amg-lounge/190753-very-unstable-c63-coupe-5.html

I had a similar issue when I went to Austria in 2014 and saw this thread when posted but doesn't look to be resolved, I also got a noise coming from the car back then at 180mph down the autobahn and took it into mb but they could not see nothing wrong with the car and cannot test at speed to replicate it.

 

[PhilT]

Right guys need help again, they have checked all the car over and can find nothing wrong with it, yet admit the problem with how the car handles is there. They have said that my tyres are not MO spec which they think could be the problem.

They dont make Super sports in MO spec, loads of other people have fitted these to their c63 but had no issues. Also the new c63/c63s has the same times fitted but 265 rears.

 

[J LAD]

Where did you get the tyres from? Have they been fitted correctly?
Have you checked they are absolutley the right size, rim and width?, back and fronts?
Take each wheel off and have them put on the balancing machine, how do they look when spun at speed, if nessecary put a DTI clock on them?, are they running true?

 

[Peter DLM]

Maybe try to borrow a rear set from another C63 fitted with MO tyres to disprove the theory. It sounds unlikely, but I've had experience of a front tyre that looked ok but pulled horribly to one side no matter what geometry changes were made.

 

[sirius9]

Right guys need help again, they have checked all the car over and can find nothing wrong with it, yet admit the problem with how the car handles is there. They have said that my tyres are not MO spec which they think could be the problem.

They dont make Super sports in MO spec, loads of other people have fitted these to their c63 but had no issues. Also the new c63/c63s has the same times fitted but 265 rears.

Was it an MB garage or an independant garage you went to?
May be worth having a reputable indie have a look over.

 

[brucemillar]

If there is no obvious damage to the suspension or steering? Then it has to tyres, wheels or set up.

As above have tyres checked for direction, size, fitment & pressure.

If all ok. I would check geometry. Go to a good 4 wheel alignment place and have it checked.

Get a mate and a bit of string. Hold string from centre of rear wheel to centre of front wheel and cut. Repeat on the other side.

Check your strut mounts are tight.

Sent from my iPhone using MBClub UK

 

[ash59fifty-uk]

Just a thought but I remember a post on here explaining the importance about something on the tyre, and how many fitters don't notice. It was a coloured line on the tyre, something like that?

Anyone else remember that post?

 

[PhilT]

Where did you get the tyres from? Have they been fitted correctly?
Have you checked they are absolutley the right size, rim and width?, back and fronts?
Take each wheel off and have them put on the balancing machine, how do they look when spun at speed, if nessecary put a DTI clock on them?, are they running true?

My mate who owns a tyre shop got them and fitted them, He has fitted all the previous Yokos too. Sizes are the same as the standard yokos that were fitted to the standard 19's.

Yes they are not MO spec but everyone else who has bought PSS tyres on here do not have MO spec ones and have no problems :/

I can ask about putting wheels on balance machine is that what a DTI clock is?

 

[PhilT]

Maybe try to borrow a rear set from another C63 fitted with MO tyres to disprove the theory. It sounds unlikely, but I've had experience of a front tyre that looked ok but pulled horribly to one side no matter what geometry changes were made.

Mercedes say they are so sure its tyres that they are going to order a full set of conti's mo spec and let me try them on the car. Then said if it fix's it they cannot put any more hours into looking at the car. They will only work on it if the tyres dont fix the problem so its going back Tuesday.

If there is no obvious damage to the suspension or steering? Then it has to tyres, wheels or set up.

As above have tyres checked for direction, size, fitment & pressure.

If all ok. I would check geometry. Go to a good 4 wheel alignment place and have it checked.

Get a mate and a bit of string. Hold string from centre of rear wheel to centre of front wheel and cut. Repeat on the other side.

Check your strut mounts are tight.

Sent from my iPhone using MBClub UK

They said they can see nothing under the car and said its one of the best looked after they have seen haha.

Tyres are right size and pressures as per fuel cap for 3 people load. Mb said they are wrong because they are not MO spec.

4 wheel alignment is £200, mb said it would be a waste when it has the wrong tyres. I said i cant believe its the tyres just because they are not MO spec because alot of people on the forums have them.

Just a thought but I remember a post on here explaining the importance about something on the tyre, and how many fitters don't notice. It was a coloured line on the tyre, something like that?

Anyone else remember that post?

Not seen that one or heard of it, tyre monitor has come on 4 times now and tyre went low suddenly and moved about on the wheel

 

[Peter DLM]

the colour line is to show how centred the balance is on the tyre, if the lines are way off to one side then the tyre will pull to that side, the idea is to match it with a tyre with the lines on the opposite side etc. Ideally lines nearer the centre is best.

There's something wrong if the tyre is moving on the rim.

 

[PhilT]

the colour line is to show how centred the balance is on the tyre, if the lines are way off to one side then the tyre will pull to that side, the idea is to match it with a tyre with the lines on the opposite side etc. Ideally lines nearer the centre is best.

There's something wrong if the tyre is moving on the rim.

It isnt now but the whole car feels wolloly as Merc said like the side walls arnt stiff enough causing the car to feel very strange. The car spins in the dry setting off too with traction control kicking in which it has never done before the problems.

 

[StuartK]

Fair play to your dealer for offering what they have with the tyres? Which dealer?

 

[SUMO]

Have you checked to make sure the new tires are the correct load rating for the car?

 

[J LAD]

I dont want to sound condescending here, but lets go on what the cars system is telling you.
" tyre pressure monitoring / pressure low".
For me, in my opinon, the tyres are not gripping or sealing on the rim correctly, as you say they are moving around. When were the tyres made, it will tell you on the tyre wall.
I would go with what Merc say and have 4 new OEM spec tyres fitted, by them or another specialist!
DTI or dial test indicator - it will show you how concentric the tyre is when fitted to the wheel. I had a CLS which had a bad vibration above 70MPH. Turned out the 2 front wheels were buckled badly, it was only apparent on the wheel balancing unit.
What a ball ache - i do feel for you mate!

 

[PhilT]

Have you checked to make sure the new tires are the correct load rating for the car?

Says online Y91, will check the ones on the car in the morning.

 

[brucemillar]

Did you get this fixed?

Sent from my iPhone using MBClub UK